Filter of turbine air intake

FIELD: technological processes.

SUBSTANCE: invention relates to filter of turbine air intake for removal of particles from air flow at the inlet to gas turbine, which comprises composite filler made of membrane filtering layer, having porous polymer membrane, and at least one layer of volume filtering material. Layer of volume filtering material contains fibers and is arranged at discharge side of membrane filtering layer relative to direction of gas flow passing through filter. Fibers of volume filtering material layer have electrostatic charge. In preferable version of realisation, porous polymer membrane is made of the mixture of homopolymer polytetrafluoroethylene (PTFE) and modified PTFE.

EFFECT: invention makes it possible to reduce dimensions and complexity of filtering system design, to increase its service life and also to develop filter having improved property of water and salt removal.

36 cl, 4 ex, 2 tbl, 8 dwg

 

The technical field

The present invention relates to a filter of the air intake of the turbine, designed to remove particles from the gas stream entering the gas turbine.

Background of invention

It is necessary that the input of the gas turbine was supplied clean air. Small particles in the intake air can be deposited on the blades and contaminate the compressor section of the turbine. Therefore, the intake air, before to be placed in the turbine, first passes through the filter system. The filtration system must operate in harsh environmental conditions, such as on offshore platforms, in the tropics, the Arctic regions and deserts. Typical applications high efficiency filtering systems can serve them to work as part of the emergency power generators, gas turbines modern ships and gas production during its extraction from salt cores. To prevent premature corrosion of the turbine filtration system must prevent the ingress of particles of water and salt. Installed, for example, that the presence of salt particles in the intake air causes corrosion in the high temperature section of the channel of the turbine, located behind the combustion chamber.

Commonly used filter systems are very complex eliminate the STV multistage or cascade type. Cascade filtration system is composed of a series, but independent steps, containing mechanical protection from splashes (for example, cover with blinds) and logological that removes water droplets from the fog. Next can be installed pre-filter used in the filtration systems intended for use in heavily contaminated areas, to extend the service life of the filter of the last stage. Then, the intake air passes through high-performance surround filter, the operational efficiency of the filter is, for example, 85% for particles of size 0.5 µm. And finally, at the outlet of the filtration system is installed a separate filter to remove salt. The pre-filter, three-dimensional filter, and filters for salt can have a different design, for example, be in the form of cartridges, panels, filters-Minigore and filter bags. To provide the desired air flow in the turbine is used in parallel a very large number of such cartridges. For example, for a small gas turbine may require more than 50,000 m3of air per hour. Filtering the entire system may take one or more spaces, depending on the number of needed air.

The above-mentioned cascade filtration system usually is pretty bad about protect from contamination by dust, salt and water. In addition, they require frequent servicing of the filtration stages, as well as repairs due to corrosion caused by dirt, salt and water. At strong pollution is usually completely remove the Central part for repairs every three to six months.

Thus, there is a need for more compact and less complex design of the filtration systems with more durable, requiring less maintenance and has superior ability to remove water and salt. Such systems would provide the best protection of gas turbines used in harsh environmental conditions.

In EP 1266681 A2 describes the filler filter (filter material) for a gas turbine, which provides a reduced possibility of contamination of the turbine. This filler filter includes a porous PTFE (PTFE). ePTFE) membrane and two air-permeable support layer. At least one of the two reference layers is located on the discharge side of the membrane and is used as a pre-filter from atmospheric dust. Another support layer is located either on the outlet (downstream flow) side of the membrane, or between the first reference layer and the membrane and serves as a reinforcing element. You can, however, and the use of additional support layers, and even proposed to combine the function of pre-treatment and the boost function design in a single reference layer with the pressure side of the membrane.

According to the description of the preferred material for breathable support element is a fabric of untwisted filaments consisting of polyolefin fibers with an average fiber diameter in the range from 0.2 to 15 μm, and a weight fabric for the material of the pre-filter comprising 30 g/m2. The permeability of this fabric must be higher than the permeability of the porous PTFE membrane. According to the description of the porous PTFE membrane has an average pore diameter of from 0.01 to 5 μm, in one of the examples set equal to 1 μm, and the average diameter of the fibers from 0.2 to 1.0 μm, in the example set equal to 0.2 μm. When this pressure drop is from 50 to 1000 PA, and in the example is set to 176,5 PA at a flow rate passing through the membrane of air, equal to 5.3 cm/sec. the Total thickness of the filler filter is 0.15 mm and 0.3 mm

In the above description ER 1266681 provides special measures for removing static electricity, since the charge accumulation is undesirable. In the end, to prevent the accumulation of electrostatic charge breathable supporting elements are made of material, the mouth of schiwago to the accumulation of static electricity.

On the practical application of single-stage filler filter, described in EP 1266681 A2, hitherto unknown. Although this filler filter offers solutions to set tasks, there remains a need for further improvements like filler of filter in order to adapt it to practical use in gas turbines.

Summary of the invention

This goal is achieved through the proposed in the invention filter air intake of the turbine, based on having a construction similar to the device proposed in EP 1266681 A2, but with some changes. Accordingly, the proposed filter air intake of the turbine contains a composite (composite) filling the filter and frame, which has the filler to create an airtight seal between the filler and the frame, and the filler filter includes a membrane filter layer having a porous polymer membrane, and at least one layer of bulk filter material containing fibers and located on the pressure side (upstream) of the membrane filter layer relative to the direction of air flow through the filter. In accordance with the invention, the fiber material of the volume filtration layer playing the role of the filter is as pre-treatment, have an electrostatic charge.

Although an electrically charged filter material can be created using a number of known methods, a suitable message charge to the fibers without the use of heat is described in US 5401466. The charged fibers increase filtration capacity of the filter, drawing the fibers, fine particles and holding them. It was found that the pressure drop on the filler of the filter when it is growing more slowly than in the bulk filler filter in the absence of electric charge.

The retention of small particles inside the volume of the filter material (pre-filter) prevents premature clogging of the membrane filter layer due to the buildup of mud cake on the membrane surface (which is a "superficial" filler filter in contrast to the "bulk" filler filter). In this case the permeability of mud cake is saved for a longer time. Estimated in accordance with the present invention can be designed filter for continuous operation in heavily contaminated areas with service life exceeding two years, without the need for its replacement.

In a preferred embodiment, the reference layer separated from the bulk filter material, is mounted on naporn the th or the exhaust side of the membrane to provide support, allows you to withstand air pressure and the resulting pressure drop. However, it should be noted that the support layer has a strong influence on the overall permeability of the filler of the filter. This is particularly noticeable in the preferred embodiment, where the support layer forms a membrane layered structure. As a result, the permeability of the filter can be reduced up to 5 times due to its lamination with the supporting layer.

While in the preferred embodiment, the bulk layer of the filter material contains a non-woven fabric (fabric of untwisted filaments), in particular, the aerodynamic method from the melt, the membrane filter layer is made of polytetrafluoroethylene (PTFE). PTFE has a water-repellent properties and porous structure gives a surface that does not include water and it holds fine particles and therefore also prevents particles of salt. It has been shown that a particularly large effect is the use of PTFE-membranes, as described in US 5814405. These membranes have a high filtration efficiency and resistance to air flow and tensile strength. This document details the methods of making suitable PTFE-membrane, and this description is incorporated into this disclosure by reference. Deniedthe-membranes are delivered by the company W.L.Gore & Associates, Inc., Newark, the state delawar. Can be, however, used PTFE-membrane similar designs produced by other methods.

It was found that PTFE-membrane of this particular type are a good compromise in regard to important parameters: permeability, the capture of water and salt, filtering ability in relation to small particles and serviceability. In particular, the point of the hole, which usually occur when the filler of the filter is to create a pleated cartridges or panel filters do not create problems in the case described PTFE membrane.

The marked advantages of the membrane can be attributed to their microstructure. In particular, the internal microstructure of the PTFE membranes are described in US 5814405, consists basically of a sequence of nodes connected by fibrils and nodes, mostly located on parallel lines, strongly elongated and has a ratio of large and smaller sizes of 25:1 or, more preferably 150:1 or more. This structure can be obtained when the PTFE membrane is made from a mixture of PTFE homopolymer and modified PTFE polymer.

While the average effective pore size of the membranes disclosed in US 5814405, less than or equal to 1.5 μm, for alanaleigh of the invention, the preferred average effective pore size exceeds 1.5 μm, being, in particular in the range from 1.5 to 15 μm, and in the preferred embodiment is about 3 μm. This can be easily achieved by further stretching of the membrane in the longitudinal and(or) transverse directions during its production to obtain the desired porosity.

This is an opportunity to create a filter inlet turbine containing compound filler filter with a layered bead comprising PTFE-membrane and the support layer, and at least one electrically charged layer of the filter material obtained aerodynamic method from the melt, and the layered structure has a permeability from about 3 to 15 units of Frazee, and the filtration efficiency of particles at least 90%, in particular more than 95% for particles of 0.3 microns at a speed of 10 cm/s, in particular, at a speed of 5.3 cm/s or lower the front speed, while the filler of a filter obtained by the aerodynamic method from the melt, has a permeability from about 30 to 130 units of Frazee and filtration efficiency of particles at least 50% for particles 0.3 microns. The filtration efficiency of 99% or higher for particles 0.3 microns at a frontal velocity of from 1 to 10 cm/s can be obtained from such a composite filter (H12-13), which is essential for use in gas turbine intakes.

In the line is the use of the present invention there is no need to install individual traps. In addition, supporting the pre-filter constitutes a part of the filler filter, so the filler filter in accordance with the present invention can be used in the most harsh environments at temperatures from -60°C to +70°C. finally, do not require a separate filter for salt, because the membrane environment resistant to water (IP X5) and a well-delays salt. This provides effective protection against corrosion of turbine parts. Single-stage filler filter in accordance with the invention has a low weight, and its estimated useful life is 2 years or more in the most severe environmental conditions.

Thanks to the multi-layer structure of the composite filler filter only the smallest particles in the air can penetrate through the pre-filter and delay to reach the membrane surface. The pre-filter, the obtained aerodynamic method from the melt, having a filtration efficiency of about 90%, lters, thus, most of the particles. With time on the pressure side of the pre-filter is formed filtration cortex. This filtration cork creates additional filtering effect. Filtration peel over time, increasing the em its filtration efficiency and forms a sort of an additional pre-filter. When filled so the filter is exposed to moist air with a relative humidity of, for example 90%, represents an important property of the mud cake from the point of view of the entire filler filter. In particular, if the filtration crust formed directly on the surface of the membrane filler, swelling of the particles of mud cake in a moist climate would increase the pressure drop on the filler of the filter. This increase of pressure drop, however, is smaller if the filtration cortex is separated from the membrane surface, for example, through a pre-filter.

Brief description of drawings

Below the invention is described in more detail with reference to the accompanying drawings on which is shown:

figure 1 shows the cross section proposed in the present invention the composite filler filter to filter air intake of the turbine,

figure 2 presents a cross-section of another composite filler filter with a separate supporting layer on the exhaust side of the filler filter,

figure 3 presents a cross-section of another filler filter with a separate support layer located in the middle

4 shows a cross-section of another version of a filler of a filter with additional strengthening is shining layer on the discharge side of the filler filter,

figure 5 presents a perspective view of the filter to use to filter air intake of the turbine,

figure 6 presents a perspective view of a filter cartridge for use as a filter of the air intake of the turbine,

figure 7 presents the example of an enlarged view of the cross-section structure of the membrane filter layer is preferred variant implementation, which forms part of the composite filler filter, and

on Fig presents a graph illustrating the advantage of the composite filler of the filter compared to other membrane filters.

Detailed description

The composite filler of the filter used in the filter of the air intake of the turbine, in accordance with the present invention has at least two filter layer membrane filter layer and the bulk filter layer. The membrane filter layer contains a porous polymer membrane. With the pressure side of the membrane filtration layer relative to the air flow direction is at least one layer of bulk filter material. The composite filler filter may further include a support layer. The support layer can be located with the pressure side of the membrane filter layer relative to the direction of movement of the air through the Phi is Tr, and prom parties. The supporting layer may also be formed with a layered membrane structure.

Figure 1-3 shows the cross-section of several variants of the composite filler 10 of the filter, the total thickness of which in the preferred embodiment, is from 0.5 to 1.5 mm Layer 18 volume of the filter material is located on the discharge side of the membrane filter layer 20, the direction of air flow shown by the arrow (figure 1). Figure 2 shows the filler 10 of the filter containing support layer 22 located on the discharge side of the membrane filter layer 20. Figure 3 support layer 22 is located on the discharge side of the membrane filter layer 20 between the layer 18 of volume of the filter material and the membrane filtration layer 20. While in the preferred embodiment, the support layer 22 is thermally or being glued laminated to the membrane filter layer 20, the layer 18 volume of filter material may be loosely associated with the membrane filter layer 20 and base layer 22, respectively.

In addition, as shown in figure 4, on top of the layer 18 with three-dimensional filter material as the upper layer can be placed reinforcing layer 23 in the form of, for example, the network of fibers in order to prevent violations of the arrangement of fibers in the layer 18 of volume filtered is his material in the process of maintenance, and processing of the filler 10 of the filter. In the preferred embodiment, reinforcing layer 23 is made of material obtained aerodynamic method from the melt, with a specific weight per unit area of approximately 5-10 g/m2and can be attached to the layer 18 bulk filter material thermally, mechanically or by gluing.

In the preferred embodiment, as clearly seen in figure 5, the filler 10 filter complex corrugation in order to provide greater structural strength and significantly increase the area of the filter surface. Filler homerooms so that the crests 26 of the folds of the membrane filtration layer 20 were docked with a volume filtration layer 18. In a preferred embodiment, the corrugations may have a height of not more than 250 mm, and preferably in the range of from about 30 to 90 mm, Although shown in figure 5, the filler 10 of the filter is complex, forming a corrugated panel, it is often convenient to combine the edge of the panel with the formation of a cylindrical filter element (6). In a preferred embodiment, the plates are strengthened by struts with pressure and(or) discharge side in order to provide the filter with a high front speeds in excess of 5 cm/S. in Addition, cleaning of the filler filter, exposing it to the influence of one or more pulses in the high-pressure reverse direction ("method reverse pulse"), high strength design of the flute.

Figure 5 shows the new filter with composite filler 10 of the filter installed in the frame 14. The dimensions of the frame 14 depend on the particular application and should ensure a tight installation in the pipeline, which served the cleaned air or gas. The frame may be made of any material, such as metals, including aluminum or galvanized steel, or structural polymer. In a preferred embodiment, the frame is anodized aluminum. The filler 10 of the filter must be inserted in the frame 14 so as to ensure an airtight joint between the filler 10 of the filter and the frame 14 and there was no leakage of unfiltered air around the filler 10 of the filter. Ideally, the filler 10 of the filter is installed in the frame 14 with the use of potting compound 24, for example of polyurethane, epoxy, silicone, hot melt glue or plastisol. To ensure a good seal molding compound 24 should be selected and used so that it is absorbed into the filler 10 filter to obtain a solid seal. In one cartridge filler 10 can provide air flow 500-1500 m3/hour, preferably about 1000 m3/hour.

In the embodiment, as a mechanical protection from b is ISG before the filter can be installed in the casing with shutters.

In a preferred embodiment, the bulk layer of filter material composite filler 10 is a non-woven fabric of the polymeric fiber, for example, made spunbond method, or preferably aerodynamic method from the melt and consisting of polypropylene or polyethylene, non-woven polyester material, fiberglass, microtechnology, pulp and polytetrafluoroethylene.

Aerodynamic method from a melt of the fabric is obtained by capturing the molten fibers converging streams of hot air with the formation of very thin threads. When receiving the aerodynamic method from the melt obtained continuous fibers are so thin that the thickness is beyond the scope of existing standards, with a diameter typically less than 10 microns.

The layer(s) of tissue obtained aerodynamic method from the melt, can be made of various polymeric materials, including polypropylene, polyester, polyamide, polyvinyl chloride, polymethylmethacrylate and polyethylene. Polypropylene is one of the most preferred polymer materials. Typically, the polymer fibers forming the fabric have a diameter approximately in the range of from 0.5 to 10 μm. In a preferred embodiment, the diameter of the fibers is from about 1 to 5 microns.

The thickness of layers of the volume of the Noah filter is not critical. If the particles for three-dimensional filtering is performed, for example, from tissue obtained aerodynamic method from the melt, the thickness may range from about 0.25 to 3 mm thick gives the opportunity to collect more dust. Too large thickness of the volume filtration layer may, however, limit the total number of layers that can be used in the composite filler of the filter.

The choice of material density for three-dimensional filtering is also within the competence of the specialist. The fabric weight of fibres obtained by the aerodynamic method from the melt, may, for example, be approximately from 1 to 100 g/m2, preferably the density of the fabric of fibres obtained aerodynamic method from the melt is from about 10 to 50 g/m2.

In at least one embodiment, bulk filter material is formed in the form of electret filler containing high-performance layer that carries an electrostatic charge. To improve the filtering action of electric charge is communicated to the material of the fibres obtained aerodynamic method from the melt, various known methods.

For example, suitable for use fabrics charge is communicated without its heat through effects on the fabric by a sequence of electric fields that is they way that adjacent electric fields have opposite polarity relative to each other, as described in US 5401466 (Tsai and others). As described in this document, first one side of the fabric is subjected to a positive charge, while the other side of the fabric is subjected to a negative charge. Then the first side of the fabric is subjected to a negative charge and the other side of the fabric is subjected to a positive charge. Electret filter fillers can also be made and a variety of other ways.

Bulk filter material may also contain additives that enhance filtration properties, and may also have low levels of extractable hydrocarbons to improve performance. The fibers may contain certain processed in the melt, the fluorocarbons, such as fluorinated oxazolidinone and piperazines, and connections oligomers containing perforated substance. The use of such additives may be particularly useful for the filter operation based on electrically charged fabric.

With the discharge side of the layer 18 of the volume filtration is the filtration layer 20 on the basis of a microporous polymeric membrane. Microporous polymer membrane 20 is designed to capture particles prehodyaschest layers of the volume filtration. It is known that the microporous polymeric membrane is a reliable method for the removal of particles and organisms from streams of fluid. Membranes are typically characterized by their polymer composition, permeability, pressure transmission of water and filtration efficiency.

As the membrane filter layer can be used a number of membranes, depending on the specific requirements of the application. The membrane filter layer can be formed, for example, from the following materials:

nitrocellulose, triacetyl cellulose, polymide, polycarbonate, polyethylene, polypropylene, polytetrafluoroethylene, polysulfone, polyvinylchloride, polyvinylidene fluoride, copolymer of acrylate.

In a preferred embodiment, the membrane filter layer is made of a hydrophobic material that prevents the passage of liquids. Membrane filter layer must withstand applied to the filler filter differential pressure, not flowing fluid. In a preferred embodiment, the membrane has a pressure transmission of water from 0.01 to 0.25 bar and average air permeability of from about 7 units of Frazee to 100 units of Frazee, in a more preferred embodiment, the average permeability is at least about 30 units of Frazee, in the most preferred - what about at least about 60 units Frazee.

In a preferred embodiment, the membrane filter layer is a microporous fluoropolymer, such as PTFE, fluorinated ethylene-propylene (FEP), PerformancePoint (PFA), polypropylene (PU), polyethylene (PE) or ultrasonometry polyethylene (uhmwPE).

In the most preferred embodiment, the membrane filter layer contains PTFE. Suitable PTFE membrane described in US 5814405. Described in this patent membranes have good filtration efficiency and a high durability to the effect of the air flow and rupture. Figure 7 shows the image obtained by scanning electron microscope, taken from the above-mentioned patent, which is used in this application as an example of the microstructure described here PTFE-membranes. It is seen that the microstructure of the membrane contains a sequence of nodes connected by fibrils and nodes, mostly located on parallel lines, extremely long and have a ratio of 25:1 or more. It seems that long nodes microstructure help prevent splitting of the membrane in the process of corrugating the filter, precluding the possibility of pin holes.

Membrane filter layer 20, in embodiments, the implementation may contain material-additive d is I improve some characteristics of the filter. Suitable additives, such as carbon black or other conductive additive, catalyst particles, colloidal silicon dioxide, colloidal silica, absorbent materials, such as activated carbon, or ceramic sinks, such as activated alumina or2and methods of making membranes with additives used in this invention are described in detail in US 5814405.

Support layer 22 is used for hardening the filter layer 20. Therefore, in the preferred embodiment, the material of the supporting layer must have sufficient rigidity to serve as a support for the membrane and the bulk of the filtering layers, but at the same time be soft and pliable, so as not to damage the membrane. Support layer 22 may contain tissue from the twisted and untwisted filaments. In other embodiments, suitable materials supporting layer may include twisted and untwisted yarn of polyester, polypropylene, polyethylene, fiberglass, microtechnology and polytetrafluoroethylene. Bumps must be oriented so that the air flow in the channels was expanded crests of the corrugations (i.e. let the folded ridges of the corrugations). For such applications are particularly suitable materials on the basis of untwisted fibers obtained spunbond method.

Support layer 22 may be located the Yong as on the discharge side, and with the discharge side of the membrane filter layer 20. The support material may be laminated to the membrane filtration layer, forming a supporting layer. In this embodiment, the bearing layer at the same time supports the one above it a layer of the filler obtained aerodynamic method from the melt, and performs the function of the surface of the final filter.

Test methods

Permeability:

The permeability can be determined by measuring the number of Frazee. For measuring the permeability of the test sample is clamped in a device for measuring air flow with flange with gasket, circular cross section with a diameter of approximately 2.75 inches and an area of 6 square inches. With the pressure side of the sample device is connected to the flow meter is connected in series with a source of dry compressed air. From the outlet side of the sample device has a free exit to the atmosphere. During the test, air is injected under pressure of 0.5 inch water column with the pressure side of the sample and the registered flow quantity of air passing through the series-connected flow meter (float rotameter). Before measurement the sample is aged for at least 4 hours at a temperature of 21°C and 65%relative humidity. The results of metering the deposits are given in terms of the number Frazee-dimensional cubic ft/min/sq ft for the sample at a pressure of 0.5 inches water column.

Dust holding capacity:

Capacity can be defined as follows. 3% aqueous solution of sodium chloride is sprayed through a nozzle with a constant output flow (model TSI 3096; sorvey, Minnesota). The particles are dried by heating at 80°C and then diluted clean dry air. The distribution of particle size is determined by the aerodynamic meter size particles (e.g., TSI model 3320; sorvey, mn) are Determined by the geometric mean value of the particle diameter and standard deviation.

The test sample filter diameter 44,4 mm, weighed before the test and is placed in the filter holder. The front velocity is set equal to 53 mm/s the pressure Drop across the filter is continuously monitored by a pressure sensor (e.g., Heise model PM10; Stratford, CT). The filter is loaded with an aerosol of sodium chloride up until the differential pressure on the filler of the filter reaches 750 PA. After the test the sample is again weighed to determine the added mass. The dust holding capacity is the difference between final and initial weight of the test sample.

Filtration efficiency:

The collection efficiency of the particles is measured by automated meter effective the activity (for example, the model 8160, manufactured by TSI, Inc., Saint Paul, Minnesota). The test is performed at room temperature (70°F) and 40% relative humidity. A solution of dioctylphthalate (DOP) is atomized to form an aerosol containing particles of a diameter of from 0.03 to 0.5 μm. The sample filter is tested on the capture of aerosol in air flow rate of 5.3 cm/sec. Two particle counter that uses the effect of condensation nuclei, simultaneously measure the concentration of particles with the pressure and exhaust sides of the test sample. The collection efficiency of particles is defined as captured by the filter portion of the particles supplied from the pressure side, in percent.

Comparison of charged and discharged materials obtained aerodynamic method from the melt

Different efficiency of charged and discharged materials obtained aerodynamic method from the melt (MB), is illustrated in the following Table 1 for the three examples a, b and C.

Table 1
FilterPermeability, the unit FrazeeLoad capacity, mgDust holding capacity, g/m2Improvement
Example A, PTFE 7,68,86,4-
Example, charged PTFE+MV4.912,69,143%
Example, neutral PTFE+MB5,14,43,2-50%

Example And refers to the layered PTFE-membrane containing PTFE-membrane and the support layer of polyester fiber density of 203 g/m3received spunbond method. The permeability of the membrane is around 7.6% of Frazee, and its capacity is 6.4 g/m3under certain test conditions.

The example refers to the proposed invention the composite filler filter density of 30 g/m2polypropylene fibers obtained aerodynamic method from the melt, which is attached by ultrasonic welding to the layered PTFE-membrane of example A. the Material of the fibers obtained aerodynamic method from the melt, comes Hollingsworth & Vose, OMRS., located in East Walpole, Massachusetts, under the designation TR1462A. Ultrasonic welding is performed on the entire surface of the filter points joining of approximately 0.8 mm, with Chi is scrap points about 55500 dot/m 2. The permeability of the composite filler of the filter is about 4.9 units of Frazee, and dust holding capacity was 9.1 g/m3under the same test conditions, which gives a 43% improvement.

As proposed in the present invention, the composite filler of the filter in the example carries an electrostatic charge, the example refers to the same composite filler filter, however, discharged by injecting it with isopropyl alcohol or isopropanol for neutralization of electric charge, with subsequent drying. Despite the fact that the permeability, as expected, did not change significantly in the example marked With a lower capacity compared to the example, that is only 3.2 g/m2. Surprisingly, uncharged compound filler of the filter has the capacity even lower than the capacity of one layered filler of PTFE.

Control example

Layered membrane of microporous PTFE supplied by W.L. Gore &Ass., Inc. (Newark, delavar)shows the load capacity of the membrane filter. The PTFE membrane has a permeability in the range of from 18 to 29 units Frazee, on average, about 25 units of Frazee, strength punching ball more than 0.2 bar, a weight of about 5 g/m2and has a filtration efficiency of about 95% or more at the front near the STI 5.3 cm/sec. Pressure water penetration into the membrane is about 100 mbar. The PTFE membrane is attached to the reference material obtained from spunbond method of polyester (delivery Togou, Japan) with a weight per unit area of 270 g/m2air permeability in the range of 28-32 units Frazee and strength to push on Mullen more than 14 bar. The membrane is attached to the support material at a temperature between 180°C and 350°C and a pressure of from 0.1 to 7 bar. The resulting laminated PTFE membrane has an air permeability of 5 to 8 units of Frazee. The filter is loaded with an aerosol of sodium chloride in accordance with the described methodology to achieve differential pressure 750 PA. The curve of accumulation of dust for the layered membrane shown in Fig. Full capacity is 14 mg.

Example 1

Layer with a density of 10 g/m2filler (filter material) of fibers obtained by the aerodynamic method from the melt (DelPore 6001-10P supplied Del-Star, Inc.; Middletown, delavar)placed on the discharge side laminated PTFE membrane from the "test case", forming a composite filler. The filler fibers obtained aerodynamic method from a melt made from a layer of polypropylene fibers obtained aerodynamic method from the melt density of 10 g/m2and mesh density of 10 g/m2polyester fiber is, received spunbond method. Polypropylene fibers have a diameter of from 1 to 5 μm. The average pore size of approximately 15 μm, and the thickness of the filler is approximately 0.2 mm, the bulk Permeability of the filter layer is approximately 130 units of Frazee. The electrically charged filler to improve the efficiency particulate. The filter is loaded with an aerosol of sodium chloride in accordance with the described methodology to achieve differential pressure 750 PA. The curve of accumulation of dust shown in Fig.

Example 2

The layer of filler volume filtration of a material with a density of 30 g/m2fibre obtained aerodynamic method from the melt (DelPore 6001-R supplied DelStar, Inc.; Middletown, delavar)placed on the pressure side of the membrane from layered microporous PTFE from the "test case", forming a composite filler. The filler fibers obtained aerodynamic method from a melt made from a layer of polypropylene fiber density of 30 g/m2and mesh density of 10 g/m2of the polyester fiber obtained spunbond method. Polypropylene fibers have a diameter of from 1 to 5 μm. The average pore size of approximately 15 μm, and the thickness of the filler is approximately 0,56 mm air Permeability of the layer of fibres obtained aerodynamic methods for the ohms from the melt, approximately 37 units of Frazee. The electrically charged filler to improve the efficiency particulate. Two layers of filler fibers obtained aerodynamic method from the melt, is placed on the discharge side of the layered microporous PTFE. The filter is loaded with an aerosol of sodium chloride in accordance with the described methodology to achieve differential pressure 750 PA. The results are presented on Fig.

Example 3

The layer of filler volume filtration of a material with a density of 30 g/m2fibre obtained aerodynamic method from the melt (DelPore 6001-ZOR supplied DelStar, Inc.; Middletown, delavar)placed on the pressure side of the membrane from layered microporous PTFE from the "test case", forming a composite filler. The filler fibers obtained aerodynamic method from a melt made from a layer of polypropylene fiber density of 30 g/m2and mesh density of 10 g/m2of the polyester fiber obtained spunbond method. The grid supports soft filler of fibres obtained aerodynamic method from the melt. Polypropylene fibers have a diameter of from 1 to 5 μm. The average pore size of approximately 15 μm, and the thickness of the filler is approximately 0,56 mm air Permeability of the layer of fibres obtained by Aarti amicucci way from the melt, approximately 37 units of Frazee. The electrically charged filler to improve the efficiency particulate. One layer of this filler of fibres obtained aerodynamic method from the melt, is placed on the discharge side of the layered microporous PTFE and is connected with the formation of the composite filler filter, in which the grid is located outside on the discharge side. The filter is loaded with an aerosol of sodium chloride in accordance with the described methodology to achieve differential pressure 750 PA. The curve of accumulation shown in Fig. It is largely identical to the curve of accumulation of Example 2.

A composite filling is used to create a filter cartridge, shown in figure 5. The filter cartridge contains a corrugated composite filler 10, placed in a circle, so that at least one of the edges 4 tightly closed by respective caps 2A, 2b. The filter cartridge has a height of 70 cm and a diameter of 35 cm Corrugated composite material of filler one filter has a filter area of 12.6 m2. The flow rate of the air flow 1000 m3/h is achieved at a pressure drop of about 180 PA at new filter. Inside the filling material of the filter in a circle 15 a metal mesh. To ensure the air of the gas turbine 5 MW, 64 filter to what Trigami can be installed in the same room.

The filtration efficiency of the filter is illustrated below in Table 2. Table 2 compares the effectiveness of PTFE-membrane (described in Example 1), a layer of fibres obtained aerodynamic method from the melt with a density of 30 g/m2and the composite filter according to Example 3. All three samples were tested at a speed input flow of 1 cm/s and 5.3 cm/sec Composite filter according to Example 3 has the highest filtration efficiency.

Table 2
Efficiency at 1 cm/sEfficiency at 5.3 cm/s
Particle size, micronsPTFE30 g/m2aerodynamic. the method of meltCompoundPTFE30 g/m2aerodynamic. the method of meltCompound
0.0399.78699.21899.97797.14183.18599.226
0.0599.652 95.12099.96195.99781.52398.898
0.0799.49094.80999.94695.08280.41798.703
0.199.27495.72199.93994.86881.09398.867
0.1599.18996.84799.95495.55181.64399.145
0.299.26597.65599.97496.65982.34999.440
0.399.57098.58799.99398.36085.42499.779

1. Gas turbine with air intake filter to remove frequent the C from the input to the turbine gas flow, includes composite filler (10) filter and a frame (14), which has a composite filler (10) of the filter to create an airtight connection between the filler (10) filter and frame (14), and filler (10) of the filter includes a membrane filtration layer (20)comprising a porous polymer membrane, and at least one layer (18) bulk filter material containing fibers and located on the pressure side of the membrane filtration layer (20) with respect to the direction passing through the filter of the gas flow, characterized in that the fibers in the layer (18) three-dimensional filter material are electrostatically charged.

2. The gas turbine according to claim 1, in which the membrane filtration layer (20) includes a porous polytetrafluoroethylene.

3. The gas turbine according to claim 1, in which the suction side or discharge side of the membrane filtration layer (20) is located adjacent the support layer (22).

4. The gas turbine according to claim 3, in which the support layer (22) is laminated to the membrane filtration layer (20).

5. The gas turbine according to claim 1, in which at least one layer (18) bulk filter material contains a nonwoven polymer fibers.

6. The gas turbine according to claim 5, in which the nonwoven polymer fibers obtained aerodynamic method from the melt.

7. The gas turbine according to claim 1, inwhich the membrane filter layer has a permeability of at least 128 m 3/m2hour (7 units Frazee), preferably at least about 550 m3/m2hour (30 units Frazee) and most preferably 1100 m3/m2hour (60 units Frazee) or more.

8. The gas turbine according to claim 1, in which at least one layer (18) bulk filter material has a permeability of at least about 550 m3/m2hour (30 units Frazee), preferably at least about 1830 m3/m2h (100 units of Frazee).

9. The gas turbine according to claim 1, in which the composite filler (10) filter has a filtration efficiency of particles at least 90% for particles 0.3 microns in a head speed of 10 cm/s or below.

10. The gas turbine according to claim 1, in which the membrane filtration layer (20) and at least one layer (18) bulk filter material Gavrilova so that the crests (26) folds of the membrane filtration layer (20) is aligned with at least one layer (18) of the volume filtration.

11. The gas turbine of claim 10, in which the filler (10) filter has the form of a corrugated panel.

12. The gas turbine according to claim 11, in which the two edges of the panel are connected with the formation of a cylindrical filler filter.

13. The gas turbine according to claim 1, in which the membrane filtration layer (20) is a microporous PTFE of memb the Anu, internal microstructure which consists basically of a sequence of nodes connected by fibrils and mainly located in parallel to each other and strongly stretched with a ratio of large and smaller sizes of 25:1 or more.

14. The gas turbine according to clause 13, in which the aforementioned ratio of the sizes of nodes is 150:1, and more.

15. The gas turbine according to item 13 or 14, in which polytetrafluoroethylene (PTFE) is a mixture of homopolymer PTFE and modified PTFE polymer.

16. The gas turbine according to clause 13, in which the membrane filter layer has an average effective pore size of more than 1.5 μm.

17. The gas turbine according to clause 16, in which the average effective pore size of approximately 3 microns.

18. The gas turbine according to claim 1, in which the gas turbine has a maximum air flow rate in excess of 50000 m3/PM

19. Applying a filter inlet to remove particles from the incoming gas turbine of a gas stream, comprising a composite filler (10) filter and a frame (14), which has a composite filler (10) of the filter to create an airtight connection between the filler (10) filter and frame (14), and filler (10) of the filter includes a membrane filtration layer (20)comprising a porous polymer membrane, and at least one layer (18) surround the filter is of a material, contains fiber and located on the pressure side of the membrane filtration layer (20) with respect to the direction passing through the filter of the gas flow, characterized in that the fiber layer (18) volume of the filter material are electrostatically charged.

20. The application of the filter of the air intake according to claim 19, in which the membrane filtration layer (20) includes a porous polytetrafluoroethylene.

21. The application of the filter of the air intake according to claim 19, in which the suction side or discharge side of the membrane filtration layer (20) is located adjacent the support layer (22).

22. The application of the filter of the air intake according to item 21, in which the support layer (22) is laminated to the membrane filtration layer (20).

23. The application of the filter of the air intake according to claim 19, in which at least one layer (18) bulk filter material contains a nonwoven polymer fibers.

24. The application of the filter of the air intake according to item 23, in which the nonwoven polymer fibers obtained aerodynamic method from the melt.

25. The application of the filter of the air intake according to claim 19, in which the membrane filtration layer has a permeability of at least 128 m3/m2hour (7 units Frazee), preferably at least about 550 m3/m2hour (30 units Frazee) and most preferably 1100 m3/m2/sup> hour (60 units Frazee) or more.

26. The application of the filter of the air intake according to claim 19, in which at least one layer (18) bulk filter material has a permeability of at least about 550 m3/m2hour (30 units Frazee), preferably at least about 1830 m3/m2h (100 units of Frazee).

27. The application of the filter of the air intake according to claim 19, in which the composite filler (10) filter has a filtration efficiency of particles at least 90% for particles 0.3 microns in a head speed of 10 cm/s or below.

28. The application of the filter of the air intake according to claim 19, in which the membrane filtration layer (20) and at least one layer (18) bulk filter material Gavrilova so that the crests (26) folds of the membrane filtration layer (20) is aligned with at least one layer (18) of the volume filtration.

29. Filter air intake on p, in which the filler (10) filter has the form of a corrugated panel.

30. Filter air intake on clause 29, in which the two edges of the panel are connected with the formation of a cylindrical filler filter.

31. The application of the filter of the air intake according to claim 19, in which the membrane filtration layer (20) is a microporous PTFE membrane, the internal microstructure of the cat the swarm consists mainly of sequences of nodes, connected by fibrils and mainly located in parallel to each other and strongly stretched with a ratio of large and smaller sizes of 25:1 or more.

32. Filter air intake on p, in which the aforementioned ratio of the sizes of nodes is 150:1, and more.

33. Filter air intake on p or 32, in which polytetrafluoroethylene (PTFE) is a mixture of homopolymer PTFE and modified PTFE polymer.

34. Filter air intake on p, in which the membrane filter layer has an average effective pore size of more than 1.5 μm.

35. Filter air intake on clause 34, in which the average effective pore size of approximately 3 microns.

36. The application of the filter of the air intake according to claim 19, in which the maximum air flow through the air intake of the gas turbine exceeds 50000 m3/H.



 

Same patents:

FIELD: filtering.

SUBSTANCE: filtering material comprises sheet substrate with the first surface and second surface provided with a layer of thin fibers approximately 0.001-0.5 μm in diameter. The thickness of the layer is less than 5 μm, and the thin fibers are composed of condensation polymers, binding polymer, and resin additive. The filtering baffle and method of catching admixtures from air flow are presented.

EFFECT: improved quality of filtering.

21 cl, 6 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of polymer fibrous filtration materials and covers the method of electroforming 1-10 mcm diametre fibers from 5% to 20% by weight of polymer solution in organic solvent that features viscosity of 3.5 to 5.0 p at electroforming voltage of 60 to 140 kV. In compliance with this method, the used polymer used represents chlorinated polyethylene or polypropylene with chlorination of 64-66% and molecular weight of (2-15) 105. Material, thus produced, is used for protection of respiratory system when applied on dressed gauze substrate.

EFFECT: higher protective properties.

3 cl, 8 tbl

FIELD: machine building.

SUBSTANCE: material corresponds to track membrane on base of poly-ethylene-terephtalate with average disperse dimension of open pores from 10 nano-metres to 3 microns, surface of which contains poly-siloxane block copolymer. The procedure consists in dissolving poly-siloxane block copolymer in solution of toluene containing complexes of fullerenes C60, in treating the track membrane on base of poly-ethylene-terephtalate with prepared solution and in its drying till removal of toluene.

EFFECT: production of material with reduced adhesion properties of surface, with simplified procedure of cleaning and with capability to eliminate micro-organisms present in water.

2 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: non-woven textile is proposed, having air-permeable adsorbent carrier particles, duplicated on at least one side by air-permeable layer of material with an adhesive layer, and which is non-woven fibre material with specific mass ranging from 90 to 120 g/m2. Specific mass of non-woven material which is duplicated by the fibre non-woven material ranges from 20 to 40 g/m2, and dimensions of the adsorbent range from 0.3 to 1.0 mm.

EFFECT: invention widens the range of high-efficiency sorption-filtering materials.

13 cl

FIELD: production processes.

SUBSTANCE: invention refers to fine purification of air from particulate pollutants and gases, from carbon monoxide in particular by means of nonwoven filter materials. Presented multilayer filter material from polysulphon consists of three layers, at that second (working) layer is made of fibers with diametre from 5 to 9 mcm, with surface density 40-50 mg per cm2, free volume from 95 to 98% and average dimension of pores is from 20 to 40 mcm, surface density of first and third (protective) layers is 15-30 mg per cm, they are made of fibers with diametre 1-3 mcm, with free volume from 94 to 97% and average dimension of pores is from 4 to 12 mcm.

EFFECT: invention ensures possibility of effective inclusion of dispersed phase with sorbing or catalytical properties in filter material structure.

3 cl, 3 tbl

FIELD: treatment facilities.

SUBSTANCE: invention is related to filtering materials for cleaning of gaseous medium, in which nanosize first fibres of aluminium oxide and second fibres are arranged in the form of matrix with formation of asymmetric pores, at the same time each of specified second fibres has diametre in the range from approximately 0.6 mcm to approximately 3.5 mcm, at the same time asymmetric pores have average size of more than approximately 10 mcm and less then approximately 38 mcm, material may retain particles, size of which is many times less than specified pore size.

EFFECT: according to invention, filter has high efficiency of filtration and high absorbing property.

47 cl, 7 tbl, 14 dwg, 10 ex

FIELD: chemistry.

SUBSTANCE: invention relates to making filtering materials for respirators. Filtering fibre material is proposed, as well as a method of making said material by electrostatic moulding microfibres from a polymer solution in an organic solvent. The material contains fibre of diametre 1-10 mcm from chlorinated polyethylene, characterised by mass content of chlorine of 60-70%, has surface density of 20-60 g/m and is used as the working layer of the respirator.

EFFECT: high mechanical strength of the material with high retention potential.

4 cl

Filtering element // 2375103

FIELD: textile fabrics, paper.

SUBSTANCE: invention is related to the field of water treatment. Filtering element for drinking water treatment is made in the form of bobbin wound at the angle of 12°-15° onto porous cylinder by two parallel cords with thickness of 1-2 mm from polymer ion-exchange fibre in mixture with activated carbon particles, besides one cord is arranged with the right twist, and the second one - with the left twist.

EFFECT: full use of filtering material components.

1 dwg

FIELD: textile fabrics, paper.

SUBSTANCE: invention is related to multilayer filtering materials. Suggested nonwoven material consists of inlet and outlet layers. Outlet layer consists of main and additional sublayers previously attached to each other. Inlet layer and main sublayer of outlet laye consist of mixture of hollow silicone fibre with linear density of 0.68 tex and polypropylene fibre with linear density of 2 tex, and additional sublayer of outlet layer consists of polypropylene fibre with linear density of 0.68 tex. Ratio of surface densities of inlet and outlet layers makes 1:1÷1:1.5.

EFFECT: improved operational properties.

2 dwg

FIELD: means of protection.

SUBSTANCE: invention relates to production of a filtering and sorbing material used in the means of personal respiratory protective equipment to cleanse the air form fumes and aerosols of hazardous substances. The filtering and sorbing material containing polypropylene fibers filled with microatomised carbon, fibers of sulfate unbleached cellulose and fibers of mercerised cellulose is obtained by adding the polypropylene fibers in the amount 5-10% of the total mass at the stage of grinding the sulfate unbleached cellulose after which combined grinding of the mixture is continued until the grinding degree of 28±2°SHR is reached, the mixture is then mixed with the fibers of mercerised cellulose and carbon, paper web is poured dried and treated with an impregnating solution containing nickel chloride (II) - 10%, ferrous chloride (III) - 10%, copper chloride (II) - 10%.

EFFECT: production of elestic well draped filtering and sorbing material with high mechanical and adsorbtion characteristics and a low aerodynamic resistance to respiration.

1 tbl, 1 dwg

FIELD: medicine.

SUBSTANCE: method involves as follows. Electroformed nonwoven fibrous polymer fabric is impregnated with aqueous or aqueous-alcoholic suspension of aluminium material particles then hydrolysed by heating the suspension impregnated fabric that is impregnated by suspension spraying over its surface. The heating process in performed in the open air at relative humidity at least 70%, preferentially 95-100% of at least two stacked suspension impregnated fabrics. Upon termination of hydrolysis process, plane parallel wringing of the fabrics follows.

EFFECT: improved performance of a sorbent owing to formation of the composite sheet sorbent involving uniform distribution of porous particles of oxide-hydroxide aluminium phases over the entire volume of the fabric, formation of the sheet sorbent fabric of uniform thickness and density.

7 cl, 2 ex, 1 tbl

FIELD: methods of production of electret items, electret filters and respirators.

SUBSTANCE: the invention presents a method of production of electret items, electret filters and respirators with heightened resistivity to the oil mist. The invention falls into production processes of electret items, electret packed beds and respirators, and may be used for removal of corpuscles from gases, especially for removal of aerosols from air. The method provides for: formation of a melted material consisting of a mixture of a polymer composed of a mixture of a polymer representing a non-current-conducting thermoplastic resin with a specific resistivity exceeding 1014 Ohms·cm with a fluorine compound as an additive compound; shaping it to the required form and quenching it up to the temperature lower than the melting point of the polymer. The material is calcined and treated with an electric charge to give it electret properties. The invention improves the capability of filtering oily aerosols.

EFFECT: the invention improves the capability of filtering oily aerosols.

19 cl, 16 tbl, 19 dwg, 23 ex

FIELD: methods for imparting charge to fibrous webs by means of non-aqueous liquid for usage of said webs as filters in filtering face masks for protection of user's mouth and nose.

SUBSTANCE: method involves wetting web formed from non-conductive fibers with non-aqueous polar liquid; substantially drying web for producing fibrous electronic web. Method differs from known methods of imparting charge to web in that it requires less energy for drying of web than methods using aqueous liquids. Also, many kinds of filaments poorly wetted with aqueous liquids are immediately wetted with non-aqueous liquids.

EFFECT: increased efficiency and simplified method.

12 cl, 2 dwg, 6 tbl, 26 ex

FIELD: fine-fiber filtering materials.

SUBSTANCE: the invention is pertinent to fine-fiber filtering materials used for individual means of protection of respiratory organs. The invention offers a protection material, a means of protection containing the offered material and a method of production of the fibrous material providing for electrostatic forming of the fibrous material from a solution of styrene copolymer with acrylonitrile in an organic solvent at the presence of electrostatic additives of bromide or iodide salts of tetraethyl- or tetrabutyl-ammonium. At that a solution containing an additive of a high-molecular methylmethacrylate in amount of 0.001-0.01 mass % in the capacity of dissolvent is used a mixture of ethyl acetate with butyl acetate at their mass ratio in the solution from 1/9 up to 9/1 accordingly. The invention allows to produce a material with improved mechanical characteristics and to provide stability of the production process.

EFFECT: the invention ensures production of the material with improved mechanical characteristics and stability of the production process.

5 cl, 2 tbl, 1 ex

FIELD: fine filtration of air; cleaning ventilation emissions from oil mist; cleaning air in venting pipe lines of gas-transfer unit oil tanks.

SUBSTANCE: proposed filter includes filter element with filter medium made from coarse and fine fibers laid in between outer and inner cylinders, cover and bottom. Filter medium is made from longitudinal and transversal oil-resistant synthetic (polypropylene) fibers; ratio of mass of longitudinal and transversal fibers is equal to (6-8) : 1 and ratio of diameters of thin and coarse fibers is equal to (0.5-1) : 10.

EFFECT: enhanced efficiency of cleaning at considerable increase of service life, oil return coefficient; enhanced ecological safety around compressor stations.

2 cl, 2 dwg

FIELD: filtering materials for liquid and gaseous fluids.

SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.

EFFECT: enhanced strength.

1 dwg, 1 tbl

FIELD: polymer materials and gas treatment.

SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm3, and electric charge with surface density 17-21 nCl/cm2, the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm3, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.

EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.

1 tbl

FIELD: methods and devices used for production of fibrous electret linen.

SUBSTANCE: the invention is pertaining to methods and devices used for production of fibrous electret linen. The method of giving of an electrostatic charge to the fibrous non-woven linen provides that the fibrous linen is soaked with a wetting liquid, then it is saturated with a water polar liquid and dried. The gained dry product represents an electret, which may be efficiently used in the air filters, for example, in respirators.

EFFECT: the invention ensures production of a fibrous electret linen, which may be efficiently used in the air filters, for example, in respirators.

13 cl, 3 ex, 5 tbl, 4 dwg

FIELD: chemical industry; oil refining industry and other industries.

SUBSTANCE: the invention is pertaining to production of materials for the filtering water-separating elements used in devices for purification of organic fluids, predominantly, hydrocarbon fuels, oils, oil products from the emulsified water and mechanical impurities, and may be used for purification of aircraft and car fuels in chemical industry, oil refining industry and other industries. The porous reinforced material is produced out of a permeable in all directions polymeric material with a side-porous deep structure having a total porosity of no less than 50 % with the sizes of the elementary pores, predominantly, of 10 - 200 microns. At that the porous reinforced material is formed out of a framed material having filaments or fibers with a diameter, predominantly, of 5 - 400 microns, and an arranged between the above mentioned filaments or fibers filler manufactured out of a porous polyvinyl formal produced by the method of a dew-point structurization with the thermal treatment of a homogenized in water composition containing at least polyvinyl alcohol and aldehyde. The element for the screen-water-separator contains a filtering-coagulating septum embraced by a perforated shell rings and limiting from above and from below covers. At that the septum is made multilayered out of a sheet manufactured out of the above porous reinforced material. The technical result consists in an increased effectiveness of purification of fuels (jet engine fuels and diesel fuels) and the gaseous oil products from water, and also asphalt-resinous and sulfur-containing materials, an increased service life and productivity of the filtering screens based on the indicated filtering-coagulating material.

EFFECT: the invention ensures an increased effectiveness of purification of jet engine fuels, diesel fuels, gaseous oil products from water and also asphalt-resinous and sulfur-containing materials, service life and productivity of the filtering screens based on the filtering-coagulating material.

13 cl, 3 dwg

FIELD: methods of production of filtering materials.

SUBSTANCE: the invention is pertaining to the methods of production of filtering materials, in particular, to the method of production of the filtering fibrous materials, which may be used in a means of individual protection. The filtering fibrous material is produced by an electrostatic formation of a non-woven fibrous material from a working polymeric fiber-forming solution with dynamic viscosity of 1-30P, electrical conduction of 10-4-10-7 ohm-1 cm-1 in an electrostatic field at a potential difference from 10 up to 150 kV. The solution contains in the capacity of the polymer from 8.9 up to 24.6 mass % of styrene copolymer with 5.2-30.4 mass of acrylonitrile or triple styrene copolymer with 5.2-30.4 mass of acrylonitrile and 3.7-42.1 mass % of methyl methacrylate. As a dissolvent they use ethyl acetate, or butyl acetate either their mixture. The solution in addition contains high-molecular polymethyl methacrylate, a distilled water, the lowest alcohol taken from the group ethyl alcohol, methyl alcohol or isopropyl alcohol, at the following contents of ingredients of the polymeric fiber-forming solution, in mass %: polymeric compound - 8.9-24.6; high-molecular polymethyl methacrylate - 0.011-0.02; distilled water - 0.01-0.1; the lowest alcohol - 17-28; dissolvent - the rest. The efflux of the working polymeric fiber-forming solution is exercised at the volumetric speed of 0.1 up to 6 cm3 /minute. Feeding of the working polymeric fiber-forming solution is conducted from the space interval of 12-42 cm beginning from the point of its coming out from the batching device up to the settling surface. The produced filtering fibrous material contains a technological and a working layers made out of the polymeric fibrous material produced by the above described method. The technological layer material has the surface density of 1-3 g/m2 and is made out of fibers of 3-5 microns diameter. The working layer material is made out of fibers of 1.5-3 microns diameter. The double-layer material has the surface density of 32-38 g/m2, the standard resistance of 0.8-1.2 mm of the water column and the skip coefficient of no less than 95 %. The invention ensures an improved quality of the filtering material due to an increase of efficiency of penetration of fragments with a diameter of 0.3 microns at the standard resistance of 1.0 mm of the water column.

EFFECT: the invention ensures an improved quality of the filtering material, an increased efficiency of penetration of fragments with a diameter of parts of microns at the standard resistance of 1 mm of the water column.

4 cl, 2 ex

FIELD: natural gas industry; petrochemical industry; oil-producing industry; other branches of industry; methods of production of filtering materials and the filters for purification of gases and aerosols.

SUBSTANCE: the invention offers the filtering material made out of the polysulfone fibers with different diameter of the fibers produced by electromolding from the solution in the organic solvent with addition of an electrolyte; and the frame design filter supplied with the produced material having the density of 30 - 50 g/m2. The invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

5 cl, 1 tbl, 1 dwg

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