Bag filter filtration element

FIELD: process engineering.

SUBSTANCE: invention relates to gas filtration. Proposed filtration element comprises main hollow block of porous ceramics with exposed pores. Additional hollow block, its length making 0.1-0.2 of that of the main block and inner diameter making 0.7-0.9 of its inner diameter, fits tightly in inlet end of the main block for 50%. Said additional hollow block features shape of the main block.

EFFECT: higher filter dust retentivity, reduced drag in high-temperature gas filtration.

1 dwg, 3 tbl

 

The invention relates to filtering devices, in particular to the design of the filter elements of the filter bag, and can be used in filtration systems for filtering hot (500-1200°C) gases from high temperature process units, in ferrous and nonferrous metallurgy.

At the present time to dust in many industries use bag filters, equipped with a fabric sleeve of constant cross-section. The type of fabric determines the efficiency of the filtration system.

The sleeves regeneration (dust removal) is performed by a pulse of compressed air or low-pressure reverse purge. Formed on the sleeve dusty residue is removed in the bunker.

The basic condition for the effective operation of dry gas cleaning is the right choice of filter cloth. Filter bags for the purification of gas in the Ferroalloy industry are made from organic synthetic fibers or fiberglass.

Regardless fiber filter materials woven and non-woven (like felt). In the production of woven materials thread intertwines the weaving machine. Non-woven materials made from synthetic and glass fibers. The structure of non-woven materials like felt. The most simple is m non-woven material, used for the production of filters, is the "needle" felt. "Needle punched" canvases, compared with the woven cheaper, have better characteristics of the dust. However, their resistance is lower than woven materials.

Abroad for cleaning gases from Ferroalloy furnaces, use a sleeve made of fiberglass. Working temperature of the sleeve is not more than 200°C. the tensile Strength of the glass is high, but very low resistance to friction and bending. When using fabrics require special design of the suspension sleeve - adjustable springs. Regeneration glass cloth sleeve is only permitted with a back-blowing.

A special position is occupied by the filter bags of fabric made with application of membrane technologies. The greatest experience in the manufacture of fabrics coated membrane have American firms producing tissue under the name "GORE-TEX" and "BHA-TECH". Fabric GORE-THOSE" sews sleeves and equips them their gas cleaning firm "Elkem".

The membrane is a microporous PTFE membrane with a thickness of about 50 microns, which is attached to the surface normal of the filter materials, including felt and woven materials.

The lack of sleeves with coated membrane is their high cost. Operation of the hand is s with membrane coating should provide a thorough preparation of the gas to clear, the ingress to the surface membrane of red-hot coke particles, wood chips, coal. This limits their application in metallurgical aggregates.

An important characteristic of the filter is the permeability, which determines the bandwidth of the filter plant, its size and the efficiency of gas cleaning from dust. The permeability of the filters is determined by the formula:

S=ΔP/V

where S is the conditional measure of permeability;

ΔP is the pressure drop across a baghouse, mm Vogt;

V - the rate of passage of gas through the filter, m/hour.

Conditional indicator of permeability for filters of Mylar tissue is equal to 6, fiberglass membrane covering type "GORE-TEX" - 4, fiberglass - 8. The smaller the value of the conditional measure of the permeability, the better the filter.

On dry gas cleaning OJSC Kuznetsk ferroalloys" air-gas mixture is diluted with air to a temperature of 150°C and clear of dust in the pressure bag filters. The dust-free gas through the aeration lantern released into the atmosphere.

Thus, the prior art filter element filter bag, which is made of a fabric in the form of a sleeve of constant cross-section.

The lack of industrial filtering elements (bags) are of constant cross section is low use the ionic strength and efficiency, because the fabric due to frequent deformation of the sleeve from direct purification and reverse the motion of the gas for regeneration quickly wears out and fails. Wear of the filter element (sleeve) contributes to the low resistance of the cloth when cleaning gas with high (>500°C) temperature.

Analogues and prototypes

Known filter elements - sleeve uniform cross section.

Use sleeves, made of multifilament yarn consisting of elementary filaments of the same size, arranged in parallel [1].

Use sleeves, made of thin metal or artificial fibres. The cell sizes between threads is reduced by coating the outer surface of the threads electrolytic method or sputtering [2].

Sleeves are made from fibrous canvas. The obtained non-woven material is applied on thermoplastic non-woven material and the two layers again pierce. Then double-layer non-woven material is subjected to heat treatment, and a thermoplastic layer is melted, forming a porous structure for filtering [3].

Use the filters from the material, in which between the input and output sides in the layer there is a continuous density gradient with a uniform distribution of fibers in the cross section [4].

Made filter bags of constant cross-section on the basis of the e composite materials [5].

A disadvantage of the known constructions of the filter elements (analogues) of constant cross-section is reduced retention capacity of the filter during the filtration of high temperature gas to disperse sublimates volatile compounds and reduced operational stability of the filter element filter bag due to clogging of pores dispersed dust.

The technical nature closest to the proposed filter element filter bag is a filter element filter bag material based on cotton cellulose and powdered sorbent [6].

A disadvantage of the known filter element of constant cross-section is that when the filtered gas from the condensed dispersed sublimates volatile compounds reduced retention capacity of filter efficiency filter dust) due to deep clogging pores. This increases the hydraulic resistance of the filter. Fabric filter bag due to frequent strain forward and reverse motion of the gas at regeneration and low temperature resistance quickly wears out and loses its filtering ability.

Description of the invention

The objective of the invention. The increase in retention with respect to dust and reducing the hydraulic resistance of the filter when the filter is the so called high temperature (500-1200°C) gas dispersed sublimates volatile compounds.

The task is solved in that the main unit filter element tubular ceramic filter is hermetically 50% additional hollow block length of 0.1 to 0.2 of the length of the main unit with an internal diameter of 0.7 to 0.9 from the inner diameter of the main unit.

The essence of the invention lies in the fact that the proposed device increases the inhibiting ability in relation to disperse sublimates volatile compounds, increases the resistance of the filter and reduces the hydraulic resistance of the filter during the filtration of high temperature (500-1200°C) gas.

The drawing shows the proposed filter element filter bag.

The device comprises a hollow block 1, which is made of porous ceramics with an inner diameter D. in Addition, the device comprises a block 2 which is made of porous ceramics with an inner diameter d and outer diameter equal to the inner diameter (D) of section 1.

The connection of hollow block 1 with hollow block 2 is airtight connection and a circular sealing gasket 3, including bolted coupler. The ratio of the length of the block 2 to the length of the block 1 is 0.1-0.2. Block 2 from the input end by the movement of gas is 50% in the hollow cavity of the block 1. The protruding portion of the unit 2 serves as a nozzle for gas supply and attach the placenta is found in the filter element tubular ceramic filter. From 2-10 tubular filter elements form the sleeve estimated length.

Design feature is that the ratio of the inner diameter d of the hollow block 2 to the inner diameter D of the hollow block 1 is 0.8-0.9.

If the ratio of the inner diameter d of the hollow block 2 to the inner diameter D of the hollow block 1 is less than 0.8, then decreases the bandwidth of the filter due to clogging of the filter material dispersed particles of dust.

If the ratio of the inner diameter d of the hollow block 2 to the inner diameter D of the hollow block 1 is higher than 0.9, then dropping catching ability of the filter in the dust.

If the ratio of the length of the block 2 to the length of the block 1 is less than 0.1, it reduces the effect of coagulation of dispersed sublimates and catching ability of the filter in the dust.

If the ratio of the length of the block 2 to the length of the block 1 is more than 0.2, it decreases the filtration surface and detecting the ability of the filter in the dust.

The principle consists in the following. In the process of flowing gas from block 2 to block 1 are excited oscillations of gas. Dust particles having a supply of kinetic energy, falling into the scope of the field, which is a set of zones of compression and rarefaction of the gas stream, lose it as a result of inhibition is coagulated. Under the action of the gas stream passing through the filter, particles fall on the filter surface of the block 1. This contributes to reducing the speed of the gas in the volume of this block.

The location of the inner element (block 2) changes the speed and motion of the gas, intensifies the process gas filtration at the expense escalation (coagulation) of particles dispersed sublimates volatile compounds. Thus there is a uniform distribution of coarse dust on the filter surface of the block 1.

This increases the inhibiting ability against dust and prevents deep penetration of dust particles in the open pores of the filter, increases the resistance of the filter and reduces the hydraulic resistance of the filter during the filtration of high temperature gas to disperse the particles sublimates volatile compounds.

Tight connection of the ceramic block 2 with a controllable sealing circular coupler 3 increases the connecting link with the ceramic block 1. Managed sealing plate (3) prevents the leakage of gas and reducing the pressure in the blow-off dust sediment in the regeneration of the filter surface.

The sleeve ceramic filter recruited from 2-10 filter elements by means of the output of the unit 2. The assembled sleeve of variable cross-section lining is camping on the filter unit. At the end of the last filter element is installed grommet to prevent the release of untreated gas into the atmosphere.

In the process of working on the filter surface of the hollow block 1 and block 2 is formed of solid dust precipitate, which is removed in tank filter systems reverse purge. Cleaned from dust sediment filter element is operable at subsequent cycles.

In the result of repeated cyclic use of the filter element in a filter bag on the filter surface of the hollow ceramic blocks does not form a residual layer of dust sediment.

When you regenerate the reverse purge of the inner element 2 serves as a stiffening rib, which increases the strength of the structure as a whole.

After regeneration of the filter ceramic filter element is used in the subsequent multiple loops working conditions in the composition of the filter bag without mechanical wear.

The implementation of the filter element filter bag

The implementation of the filter element filter bag made at the industrial site of JSC "Synthez-Plus".

At the site have produced a filter element filter bag of variable cross-section. For molding blocks 1 and 2 used porous ceramics obtained by pressing meritocratic the CSOs felt brand mkrv-200, corresponding to GOST 23619-79 "Materials and refractory heat-insulating refractory glass fiber". The product was infused liquid mineral binder (liquid glass). To give end-to-end porosity of the product was blown with air, and to give strength was speculi. For a tight connection of the ceramic block used managed screwed sealing krugovoy plate made of metal. The size ratio of the filter element filter bag is provided in table 1.

Table 1
The size ratio of the filter element filter bag
IndexDesignationMinimumAverageMax
Main unitmmmmmm
LengthL100015002000
The outer diameterDH_oc 150150150
The inside diameterD140134130
Wall thicknessNon101620
Additional block
LengthI200200200
The outer diameterdH_140134130
The inside diameterd126107,591
Wall thicknessh_1426,539
The ratio of block size
The ratio of lengthsI/L0,20,1 0,1
The ratio of the diametersd/D0,90,80,7

Main unit filter element filter bag, accepted for production, is a hollow cylinder with an outer diameter of 150 mm, a length of 1500 mm and a wall thickness of 16 mm

In the main unit from the input end 50% hermetically introduced an additional hollow block made with the profile of the main unit, a length of 0.1 to 0.2 of the length of the main unit and with internal diameter equal to 0.7 to 0.9 from the inner diameter of the main unit.

To impart improved mechanical strength and tightness in the joint place blocks on the outer surface of the main unit is installed managed by bolts sealing plate.

Filter element filter bag, adopted for the manufacture, meets the standards listed in table 2.

Table 2
The performance of the filter element filter bag adopted for the manufacture
Name of indicatorNorma
Tensile strength at p is thrive not less kg/cm21,5
The permeability of the filter is not less than, m3/m2min2
Crack resistance when heated to 500° C and cooled to 20° C at 30°C / min, thermal cycles, not less than100

Table 3 shows the test results of the filter element (prototype) and the proposed technical solutions.

Table 3
The test results of the filter element (prototype) and the proposed technical solutions
IndexUnitThe placeholderThe ratio of the diameters between the walls inside the blocks (d/D)
0,70,80,9
Check the capacity (cap)%80959896
The resistance of the filter (lifetime) Month15108
The hydraulic resistance of the filtermm Vogt100605570

Thus, the proposed filter element filter bag has a high retention capacity compared to the dust at 15-18%, increased resistance of the filter (lifetime) 5 to 10 times, reduce the hydraulic resistance of the filter during the filtration of high-temperature gas 30-45 mm Vogt

Comparative tests showed that the application of the proposed filter element filter bag in comparison with the known filter element filter bag increases the capacity of the plant in 2-2,5 times.

The tests show the widespread use of ceramic filter element filter bag in industrial settings.

Thus, in the proposed technical solution is achieved in the technical result.

Sources of information:

1. Bratukhin AV, Kostylev A.E. Way of getting the filter element. A.S. 1018691 the USSR, IPC B01D 39/16. VNII sintet. hair is it. N 3369063/22-26; Appl. 23.12.81; publ. in BI, N19, 1983.

2. A method of manufacturing filters. Verfahren zur Herstellung a Filters mit Poren von vorbestimmter und etwa gleicher MikrogroSSe compounds nach diesem Verfahren hergestelltes Filter Application 3515025 Germany, IPC B01D 39/14, G01N 33/12. Altenburger Electronic GmbH. N P3515025.4; Appl. 25.04.85; publ. 30.10.86.

3. Bartek Pavol Zilincik Miroslav, Mulik Milan, Jozef Sestak. The method of obtaining the filter nonwoven materials. Filtracna textilia: 8.4.28.1.7. Pat. 275988 Czechoslovak, IPC 5 D01D 39/16. Vysumny Ustav Textilnej Chemie, Zilina. N 1770-89; Appl. 22.03.89; publ. 22.01.92.

4. Tani Yatsuhiro, Ohmori Susumu, Komagata Hidaki. The filter material. Filter and process for the production thereof: 8.4.26.1. Pat. 4983193 USA, IPC 5 B01D 46/00. Toyo Koseki, K. K., Nippondenso Co., Ltd. N 453220; Appl. 21.12.89; publ. 08.01.91; prior. 12.11.80, N 55-159959 (Japan); NPC 55/487.

5. Vasyukov V. a method of manufacturing a filter material. Pat. 2176697 Russia, IPC 7 D21F 11/14, B01D 39/18. JSC "Volzhsk. NII cellulite, tighten.-the boom. industry". N 2000119646/12; Appl. 21.07.2000; publ. 10.12.2001. Eng.

6. Canary A.B., Platicina NV, Ter-Oganesyan GS a method of manufacturing a filter material based on cotton cellulose and powdered sorbent. Pat. RU # 2081231, IPC D21H 27/08.

Filter element filter bag containing the main hollow block made of porous ceramics with open pores, characterized in that the input end of the main hollow unit is hermetically 50% additional hollow block made with the profile of the main unit, a length of 0.1 to 0.2 of the length of the main block and with an inner diameter equal to 0.7 to 0.9 from the inner diameter of the main unit.



 

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5 cl, 1 dwg

FIELD: different branches of the national economy; production of the air purification filters.

SUBSTANCE: the invention is pertaining to purification of the compressed air, in particular, from the mists and may be used in different branches of the national economy, predominantly at the large compressor plants with the significant daily consumption of the compressed air. The filter contains: the body with the conical bottom with the hole in its lower part and with the top cover, the perforated metallic cylinder embraced by the wire mesh with the filtering component, the union for the purified air withdrawal equipped with the conical nozzle having the radial grooves, the union for feeding in the air for purification, the unions of input and output of the compressed air filling in the cavity of the jacket. The inlet union is made in the form of the narrowing subsonic nozzle with the curvilinear grooves on its internal surface and having the metal meshes from the side of the atmospheric air inlet. In the body there are the fixed injectors. The bottom is equipped with the condensate remover. The baffle partition with the rigidly fixed porous plate is movably fixed by means of the hinge to the top cover, and by the traction by means of the lever is connected to the condensate remover. This partition forms the chamber between the union of inlet and the plate and also the chamber between the partition and the filtering component. The technical result of the invention is reduction of the power inputs for production of the compressed air by usage of the gas-dynamic pressurization of the intake of the atmospheric air due to design of the air purification filter of the compressor made in the form of the resonator with provision of persistence of the resonance volume in the varying vibration conditions of the compressor plants operation.

EFFECT: the invention ensures reduction of the power inputs for production of the compressed air by usage of the gas-dynamic pressurization of the intake of the atmospheric air and provision of the persistence of the resonance volume in the varying vibration conditions of the compressor plants operation.

1 dwg

FIELD: chemistry; technological processes.

SUBSTANCE: filtering element consists of adjacent alternating inlet and outlet channels, linked with each other with provision for transmitting fluids through their sidewalls. The element has parts of the sidewalls, which form an intermediate wall between the inlet channels and output channels and have undulation in their cross section, providing for increase in the total volume of inlet channels. The total volume of inlet channels is more than the total volume of outlet channels. The hydraulic diameter of outlet channels ranges from 0.9 to 1.4 mm. The ratio of the total volume of inlet channels to the total volume of outlet channels ranges from 1.15 to 4. The area of the filtration zone ranges from 0.825 to 1.4 m2 per litre of the filtering element. Asymmetry coefficient of the undulation is less than 20%.

EFFECT: provision for reduced pressure drop for the whole life span of the filtering element.

21 cl, 5 dwg, 1 tbl

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