Packed column for mass exchange processes

FIELD: process engineering.

SUBSTANCE: continuous-packing column is intended for mass exchange processes. Proposed packing consists of multiple welded round-link chains suspended vertically in parallel. Said chains suspended free with no fixation or tension feature elongated oval shape of the links and distance there between equal to diameter of link rod while adjacent links of one chain are arranged perpendicular to each other. Gas flowing from bottom to top makes chains oscillate and get contact so that fluid dropping in film is mixed to intensify mass transfer. To intensify oscillation of chains in column top and bottom sections, electromagnetic oscillator is arranged to make chains oscillate.

EFFECT: higher efficiency.

2 cl, 3 dwg

 

The technical field to which the invention relates.

The invention relates to structures nozzle apparatus used for mass transfer processes in the gas (vapor) - liquid, such as a process of distillation, absorption, desorption, adsorption of natural gas, and the invention can find application in technological processes in the chemical, oil, gas and other industries.

The level of technology

In the scientific article "Hydraulic characteristics of the blade floating nozzles" (the magazine "Chemical industry", No. 7, 1980, p.49-50, author Sherstobitov CENTURIES and others) described the design of the blade floating nozzles designed for units with fluidized bed irrigated nozzles. An important feature of blade screwdriver equality of the areas of the frontal and horizontal projection. The advantage of this type of nozzle is the high efficiency of mixing in the gas and liquid phases, as well as the developed interface.

In common with the proposed design is the mobility of the elements of the nozzle.

The disadvantage of the nozzle apparatus of this design is the narrow range of gas velocities at which the nozzle is operating steadily, not being in a fluidized state.

In patent No. 2289472 described nozzle, made in the form of a torus, izgotovlenie from the cylindrical element, made of synthetic fibres by folding one or both ends. When using this nozzle gas-liquid layer is evenly distributed in the working volume of the fluidized bed of the nozzle, thus intensifying the process of mass transfer.

In common with the proposed design is the mobility of the elements of the nozzle.

The lack similar to the previous version.

In patent No. 96117802 described floating nozzle spherical shape of polymeric materials with density close to the density of water, when this column is partitioned distributive lattices.

The advantage of this type of nozzle is the high efficiency of mixing in the gas and liquid phases, as well as the developed interface.

In common with the proposed design is the mobility of the elements of the nozzle.

The lack similar to the previous version.

The closest (prototype) of the present invention to the technical essence and the achieved result is a regular nozzle, described in the patent No. 2035991. The essence of this invention consists in the following: in the Packed column body is made in the form of a bundle of tubes and the nozzle in the form of links spirals, woven into the chain. This design allowed us to increase the efficiency of the process and the performance of the column, one of the belt to reduce its size by creating a more developed surface contact of gas and liquid, the intensity of turbulence and update contact surface phases. The constructive embodiment of the casing in the form of a bundle of tubes can significantly increase the area of contact of the interacting phases. The nozzle has a large coefficient of wettability and contact area of the phase. When the gas (vapor) through the packing layer gas washes ring chain on the wire surface, this increases the active surface of the contact phase.

Gas flow rasselas nozzle, curls, forming an intensive turbulent flow, thus reducing the hydraulic resistance of the column and increases washed reagent surface of the rings. The process of turbulence increases several times, which allows to reduce the height of the column.

In common with the proposed design of the nozzle is the presence of a chain consisting of individual units and hanging vertically.

The design of this nozzle is not possible to fully ensure the effectiveness of heat and mass transfer processes due to uneven flow distribution over the cross section of the device.

The objective of the invention is to provide a new high-performance regular packing for mass transfer processes.

The technical result

The technical result of the invention consists in:

improving the efficiency of the nozzle is the intensity of the process of mass transfer in Packed device

- reducing the overall dimensions of the apparatus and, consequently, reducing the capital cost of manufacturing,

- ensuring the stable operation of the apparatus in a wide range of gas velocities (0-3,5 m/s).

Brief description of drawings

Figure 1. Apparatus with chain attachment for heat and mass transfer processes.

Figure 2. Parameters krupasindhu chain.

Figure 3. The scheme of gas and liquid flows to a chain attachment.

In figure 1 is the design of the device with chain attachment for mass transfer processes. Figure 2 shows several links krupasindhu chain and identified their main geometrical parameters. Figure 3 provides a diagram of the movement of gas and liquid through the nozzle.

Disclosure of inventions

Eliminate these drawbacks and achieve the claimed technical result from the sale chain attachments, is intended for carrying out mass transfer, consisting of many welded kruglozernyh chains, hanging vertically, parallel to each other, reach due to the fact that chain hanging freely, without rigid fixation and without tension, the distance between the links of adjacent chains is equal to the diameter of the rod, made of chain, the chain links of an elongated oval form, the adjacent links of one chain are perpendicular to each other (figure 1). The main characteristics of this us the DKI is the diameter of the rod d, the width of the chain link and the length of the chain link N and the distance between the chains (figure 2). Under the influence of a stream of gas moving from the bottom up, the chains come in oscillatory motion, occasionally touching each other, which leads to mixing in a flowing liquid film and to increase the efficiency and intensity of mass transfer. To intensify the movement of the chains in the upper and lower part of the machine is mounted electromagnetic oscillating device 2, resulting circuit 1 in an oscillatory motion.

Comparative analysis of the prototype and the claimed invention shows that a common structural characteristic are vertically freely suspended chain consisting of individual units.

The distinguishing feature of the claimed invention is that the nozzle consists of many kruglozernyh circuits 1, parallel to each other, the links of which have an elongated oval shape. Between neighboring chains is supported a distance equal to the diameter of the rod. The links of adjacent chains are able to touch each other in the oscillating movement of the chains. Chains are oscillatory motion due to the gas flow or by a special electromagnetic vibrating device 2 installed in the upper and lower part of the machine and leading chain in an oscillatory motion. Distinguishing the feature of the nozzle is also something, in contrast to known stationary nozzles and known movable nozzles chain attachment has limited mobility, and the chain can move in the horizontal direction by a distance equal to the distance between adjacent chains, i.e. the diameter of the rod is made of a chain.

The essence of the proposed design of the Packed machine with chain attachment, designed for desorption of gas from the liquid (saturated absorbent), is illustrated in the drawing (figure 1). In the case of device 3 is placed kruglozerny circuit 1, which is vertically freely suspended. Chain joining the lower and upper end of the bars 5. The chain links have an elongated oval shape (figure 2). Neighboring chains are perpendicular to each other. The key features of this nozzle is the diameter of the rod d, the length of the chain N, the width of the chain link and the distance between the parallel chains. Between neighboring chains is supported a distance equal to the diameter of the rod. The links of adjacent chains are able to touch each other in the oscillating movement of the chains. Chains are oscillatory motion due to the gas flow or by a special electromagnetic vibrating device 2 installed in the upper and lower part of the machine and leading chain in the stake is atelinae movement. Oscillatory motion is transmitted from the electromagnetic vibrating device 2 through the anchor 6 and the flexible mounting of the nozzle 4 to the bars 5. Grill 5 sets in motion the chain 1. Liquid (saturated absorbent) through the nozzle 8 is supplied to the distribution device 7 and is distributed along the chains. Purified absorbent exits the bottom of the apparatus through the nozzle 9. Emitted from the liquid (absorbent) gas leaves the apparatus through the nozzle 10.

To reduce the metal nozzle and increasing the specific surface nozzle links of the chains can be produced from a flat narrow strips.

The liquid film flows down the chain. May form a stretched film of the liquid inside the chain link. This film from two sides in contact with the gas flow, which leads to an increase in the surface mass transfer and, consequently, to increase the effectiveness and intensity of mass transfer. This, in turn, will reduce the overall dimensions of the apparatus and to reduce the capital cost of its manufacture.

The gas flows upward along a curved channels formed by the chains. Cross-section of the channel height is changed, and therefore in areas of stenosis of the thread formed the increased gas velocity and, as a consequence, in such areas is formed by low pressure. In turn, this leads to per the methodological movement of the chain links, seeking in an area of low pressure. Figure 3 area of low pressure is shown by point 11. As a result, the circuit becomes oscillatory motion, which intensifies the mass transfer.

It is advisable to set the mode of oscillation circuits, so that during the movement of liquid on the surface of one chain link τ happened at least one contact with the adjacent link of the chain. In this case, will be provided with additional agitation of the liquid in the film and updating the film surface, which will lead to an increase in the rate of mass transfer. Therefore, the upper and lower part of the machine is mounted electromagnetic vibrating device that specifies a certain frequency and amplitude of vibration is vertical, freely suspended chains. The amplitude of the oscillation circuits is equal to the distance between the chains is the diameter of the rod, made of chain. The movement of the liquid film along one chain link is on average 0.5 to 1 second. If we consider that during this time, each link has to come at least one contact with adjacent parts on both sides, therefore, the ripple frequency should be at least 2 Hz. In the absence of contacts with neighboring chains updating the surface of the film will occur only when the flow of fluid from one link to another.

Limited to the spine motility and amplitude of the elements of the nozzle, implemented in the apparatus with chain attachment, in contrast to apparatus with fluidized bed nozzles, allows to stably apparatus in a wide range of gas velocities (0-3,5 m/s).

Electromagnetic vibrating device 2 (figure 1) consists of an electromagnet connected to a constant electric current. For each lattice vibrations 5 uses a pair of electromagnets, working with alternate switching frequency. Thus, the grating 5 in attachment alternately drawn anchors 6 to the cores of the electromagnets, providing oscillatory motion with a given frequency. The periodic change of the poles of the electromagnet causes fluctuations grating 5, which is suspended from the chain. The lattice of the 5 vibrations are transmitted vertically suspended circuits 1.

The emergence of oscillatory movement of the chains leads to an increase in the intensity of the processes of heat and mass transfer and the efficiency of the nozzle. This, in turn, will lead to the reduction of the dimensions of the device.

The implementation of the invention

Offer chain attachment can be applied, for example, for the process of desorption of the gas from the liquid (absorbent). In this case, the proposed chain attachment is as follows.

In the upper portion of the apparatus on the circuit through the nozzle 8 and the switch device is in 7 served saturated gas liquid absorbent (figure 1).

The liquid film flows down the chain links 1. May form a stretched film of the liquid inside the chain link. This film from two sides in contact with the gas flow, which leads to an increase in the surface mass transfer.

The liberated gas rises upwards along a curved channels formed by the chains. Cross-section of the channel height is changed, and therefore in areas of stenosis of the thread formed the increased gas velocity and, as a consequence, in such areas is formed by low pressure. In turn, this leads to the movement of the chain, seeking in an area of low pressure. Figure 3 area of low pressure is shown by point 11. As a result, the circuit becomes oscillatory motion.

When interacting on the surface of the nozzle the flow of gas and liquid is the component mass transfer from the liquid phase into the gas phase. The liberated gas is discharged through the nozzle 10 in the upper part of the apparatus (figure 1).

Purified absorbent is discharged through the nozzle 9 in the lower part of the device.

It is advisable to set the mode of oscillation circuits, so that during the movement of liquid on the surface of one chain link τ happened at least one contact with the adjacent link of the chain. In this case, will be provided with additional agitation of the liquid in the film and updating surface the ti film, that will lead to an increase in the rate of mass transfer. Therefore, the upper and lower part of the machine is mounted electromagnetic oscillating device 2 that specifies a certain frequency and amplitude of vibration is vertical, freely suspended chains. The amplitude of the oscillation circuits is equal to the distance between the chains is the diameter of the rod, made of chain. The movement of the liquid film along one chain link is on average 0.5 to 1 second. If we consider that during this time, each link has to come at least one contact with adjacent parts on both sides, therefore, the ripple frequency should be at least 2 Hz. In the absence of contacts with neighboring chains updating the surface of the film will occur only when the flow of fluid from one link to another. Thus, the grating 5 sets in motion a chain 1.

Purified absorbent exits the bottom of the apparatus through the nozzle 9. Emitted from the liquid (absorbent) gas leaves the apparatus through the nozzle 10.

Offer chain attachment allows you to develop high speed and efficiency of mass transfer due to the high contact surface phases, as well as by upgrading the surface of the liquid film, resulting in periodic contact with each other links of neighboring chains, driven, electromagne the major oscillatory device. It will reduce the overall dimensions of the apparatus and reducing the capital cost of its manufacture.

Limited mobility and amplitude of the elements of the nozzle, implemented in the apparatus with chain attachment, in contrast to apparatus with fluidized bed nozzles, allows to stably apparatus in a wide range of gas velocities (0-3,5 m/s).

Thus, in the new design of the nozzle creates more favorable conditions for the processes of mass transfer than in known similar structures.

1. Nozzle apparatus for mass transfer processes, comprising a housing, a fluid dispenser, the fitting drain fitting drain gas-filled nozzle, consisting of a vertically suspended from chains, characterized in that the chain links have an elongated oval shape, the distance between the chains is equal to the diameter of the rod, adjacent links of one chain are perpendicular to each other, when this circuit is given in oscillatory motion with a frequency greater than 2 Hz electromagnetic vibrating devices located in the upper and lower parts of the machine.

2. Nozzle apparatus for mass transfer processes according to claim 1, characterized in that the chain links are made of flat belts.



 

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EFFECT: the invention ensures the increased effectiveness and productivity for the gas (vapor) in the mass-exchange column in conditions of the low loading by the liquid and to expand the range of the stable operation of the column as a whole.

4 cl, 5 dwg

FIELD: chemical industry; petroleum industry; natural gas industry; other industries; production of the nozzles used in the processes of the natural gas rectification, absorption, purification and dehydration.

SUBSTANCE: the invention is pertaining to designs of the regular nozzles, which are used in the processes of the natural gas rectification, absorption, purification and dehydration and also as the mixers of the liquid and gaseous streams as the separators of the phases in the separation devices, as the contact elements in the condensers of mixing, as the sprinklers of the water cooling towers and may find usage practically in all production processes in petroleum, gaseous, chemical and other allied industries. The regular nozzle consists of the corrugated plates gathered in packages installed vertically and in parallel with the inclination of the flutes of the adjacent sheets to the horizon in the opposite sides, contacting by the protruding flutes to each other and forming among themselves the free channels of the complicated geometrical form. The nozzle is supplied with the spacers made in the form of the block of the horizontally laid in the rows in parallel to each another volumetric components. At that the symmetry axes of the components laying in the adjacent in height rows are mutually perpendicular. The ratio of the height of the package consisting of the corrugated sheets to the height of the spacer block lays within the limits of 2-5. The total height of the block of the spacers lays within the limits of 1.0-4.0 equivalent diametersof one component. The equivalent diameter of channels of the corrugated sheets package and the equivalent diameter of the component of the block of the spacer are in the ratio of 0.4-0.8. The components of the block of the spacer represent the solids of revolution, which are made in the form of the multiple-thread helicoids, at that the number of the threads makes 2-4. The components of the spacer block are laid in the rows with the clearance to each other, at that the interval, which separates the symmetry axes of the adjacent components makes 1.7-2.5 diameters of one component. The invention allows to raise intensity of the processes of the heat- and mass-exchange due to turbulization of the gas streams and redistribution of the liquid.

EFFECT: the invention ensures the increased intensity of the heat-exchange and mass-exchange processes due to turbulization of the gas streams and redistribution of the liquid.

4 cl, 2 dwg

FIELD: separation of materials.

SUBSTANCE: nozzle comprises stacks made of vertical sheets provided with projections that define the sloping passages between the sheets for flowing the phases. The sheets of at least one pair of the stacks are coated with porous belts made of polymeric materials. The porous belts are connected with a source of positive charges.

EFFECT: enhanced efficiency.

3 cl, 4 dwg

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