Mess exchange apparatus with regular nozzle

FIELD: chemical engineering.

SUBSTANCE: apparatus comprises groups of parallel rectangular plates with corrugated bottom. The ribs of the corrugation are oriented along the flow, and the distance between the plates does not exceed 30 mm. Between the plates, rods or pipes are arranged at an angle 90±15° to the vector of flows. The plates are assembled in groups of parallel plates inclined downstream. The uniform distribution of fluid over the plates when fluid flows from one plate group to another group is provided by means of distributing-overflowing devices.

EFFECT: decreased hydraulic drag.

2 cl, 5 dwg

 

The invention relates to the field of chemical technology and can be used for the separation of multicomponent gas mixtures by the method of absorption or multicomponent liquid mixtures by rectification method.

Known mass exchangers nozzle type, made in the form of cylindrical columns, downloaded freely buried or regular packing: ring process, Palli, seat Burleigh, videos of Haltmeier, metal spiral, nets, balls, screw or other attachment body. In the apparatus of the Packed type, rising upward gas (vapor) phase comes into surface engagement with the film of liquid phase, washing the nozzle when the swelling liquid phase down under the action of gravity. Also known mass exchangers speed type, made in the form of cylindrical columns with fixed nozzle, / tube sheet, lattice, cascade, valve and other plates, in which the rising gas phase barbthroat through the layers of liquid collecting on the plates during movement of liquid from one side of the plates to another, which is a drain on the downstream plate. The lack of mass-transfer apparatus of the Packed type is the uneven distribution of the flow of liquid and gas phases on the horizontal brings the Yu apparatus, reducing the efficiency of mass transfer between the different flows of gas and liquid phases. The drawback of the step type is a short time of interaction of gas and liquid phases, occurring only at the moment of passing bubbles of the gas phase through the layers of the liquid phase, located on the plates, as well as the high hydrodynamic resistance of the apparatus. These shortcomings reduce the efficiency of mass transfer in the apparatus and are forced to increase the total height of the columns to achieve the desired degree of separation of components. ("Calculation and design of contact devices for distillation and absorption devices." PR NR. Tekhnika, Kiev, 1970).

Known heat-mass exchange apparatus for the interaction of the gas with the liquid, consisting of a body located inside poperechnostruynyy plates made of leaves, the ends of which are cut and are trough for flow of fluid (SU 202872, Yedavalli and others, 19.12.1967).

A disadvantage of the known apparatus is the need to ensure a significant mesterolone period with the objective of maintaining low hydraulic resistance of the device, which affects the efficiency of his work.

To eliminate this drawback is proposed a device ol the longitudinal corrugated plates. When the movement of gas and liquid flows along the edges of the corrugations of the plates the level of the lower edge of the upper plate can be reduced up to the level of the upper edge of the lower plate, and, if necessary, below, without compromising the functionality of the device. The free flow of gas is provided by the corrugation of the upstream plate, a uniform distribution of liquid over the surface of the plates and the increase in its stock corrugation is provided downstream of the plate. More dense arrangement of the plates increases the efficiency of heat transfer due to both the best regular wetting of the lower surfaces of the plates through Volno, brizga and foaming, and by increasing the surface contact per unit volume of the device.

In a preferred embodiment of the apparatus of the plates made in the form of corrugated planes of rectangular shape located at a distance of 30 mm, one above the other horizontally or with a slight slope in the direction of movement of the liquid phase so that the lower edges of the corrugations of the upstream plane was located above the upper edges of the corrugations below the plane, and the movement of the liquid phase is carried out along the ribs of the corrugations countercurrent to the movement of the gas phase with subsequent discharge at the downstream plane, or on a group of Niger is put planes.

The horizontal location of the planes is preferably carried out in countercurrent movement of the liquid phase on adjacent planes.

The location of the planes at a slight slope in the direction of movement of the liquid phase is preferably carried out with continuous movement of the liquid phase in the group of neighboring planes.

Between planes preferably placed limiters threads, made in the form of rods or tubes, through which coolant is circulated, angled 90±15° to the movement direction vector of threads.

The use of the claimed invention allows to obtain the following technical result.

The design of the device allows it to be spread evenly as a liquid, and gas phase across the width of the apparatus, and also to carry out regular stirring of the same phase, which eliminates the occurrence of parallel threads of the same phase, passing through sections of columns with different conditions of mass transfer.

The close spacing of the plates to each other allows a close contact of gas and liquid phases for intensive mass transfer in the process of moving countercurrent to each other, and the application of the principle of parallel flow streams, same phases on several plates at the same time allow AET improve the throughput of the apparatus for gas. Formed on the liquid surface waves in a close arrangement of plates dramatically increase the surface mass transfer due to the formation of the developed surface of the liquid mirror and regular wetting the lower surface of the upper plate.

The formation of self-healing under the influence of gravity layer flow of liquid and gas streams, respectively located in upper and lower zones mesterolone space, and the availability located above and below the limiters separate clearances for oncoming pass phases, allows to achieve a significantly higher mean velocities of the gas in the apparatus without mode zahlebyvayas, compared with the average velocities of the gas streams in the above mass transfer apparatus. The application of the principle of parallel flow streams, same phases on several plates at the same time also allows to increase the throughput of the apparatus for gas.

The use of flow restrictors prevent deformation of the plates under the action of the pressure differential on opposite sides of the plates or under the weight of the layer of the liquid phase on the plates, and also reduces parasitic longitudinal circulation flows across the plates and increase the wave generation and transverse mixing of the thread is within zone plates, located between the delimiters. Use of the internal space of the restrictions to flow of the fluid allows the heating or cooling phases directly in the process of absorption or distillation.

Shirring planes of the plates, in addition to the direct increase their stiffness, helps to ensure uniform size of gaps for passing the flow of the phases between the plane and limiters across the entire width of the apparatus and to prevent the drained areas on the surface of the plates (due to local SDUWV layer liquid phase) at low average layer thickness of the liquid on the plates.

The proposed design of the mass transfer apparatus is different from the known structures of the apparatus of the Packed type, so that the nozzle is made in the form of groups of parallel plates rectangular horizontal cross-section and at an angle of 90±30° to the direction of the gravity vector in longitudinal section, at a small distance from each other, with the discharge devices located at one of the edges of the plates, and from the known constructions of apparatuses speed type so that the gas flow barbthroat through the layer of fluid, and moves between the flow of the liquid phase, moving countercurrent with one edge of the plate on opposite, and between the constant is updated with a thin layer of liquid phase, wetting the underside of the plates.

Thus, the proposed solution meets the criteria of the invention of "novelty."

In the patent and scientific literature and other sources not described the design of mass-transfer apparatus with a regular nozzle in which the nozzle is made in the form of closely spaced horizontal plates, the movement of the liquid phase which is carried out with one edge of the plate on the opposite with the subsequent flow on the downstream plate, and the movement of the gas phase carried out in mesterolone space with one edge of the plate on the opposite with a subsequent transition in the upstream mesterolone space, countercurrent to the movement of the liquid phase.

Thus, the proposed solution meets the criteria of the invention "inventive step".

The proposed design of the mass transfer apparatus can be used in chemical technology for the separation of multicomponent gas mixtures by the method of absorption or multicomponent liquid mixtures by rectification method.

Thus, the proposed solution meets the criteria of the invention "industrial applicability".

The invention is illustrated in the drawing, in which figure 1 shows the location of single plates and accompanying elements in the cross the cross of the AI;

figure 2 shows the relative positions of single plates and related items, as well as the direction of flow (top view);

figure 3 shows the location of the Assembly of parallel plates in cross section;

figure 4 shows the location of the elements of the apparatus and circuit flows in countercurrent movement of the same phase on adjacent plates;

figure 5 shows the location of elements of the apparatus and circuit flows in straight flow movement of same phases on adjacent plates (for example, three-flow Assembly plates).

The design of the mass exchange apparatus consists of a housing assembled from individual elements 1 of a rectangular shape, between which the plates 2 of rectangular shape, made in the form of corrugated planes that have a side overflow 3 and one or two bypass openings 4 at opposite edges of the plates or one of them.

Between the plates placed limiters 5 threads made in the form of solid rods, not outside of the apparatus or pipes passing through the prefabricated elements 1 corps.

The top and bottom of the enclosure are closed lids, which have one common or two separate connections for input and output of liquid and gas phases.

When using schema sportfreak in groups of plates with straight parallel movement of the same name flows (figure 5) the design of the device provides for the distribution and overflow device 6, evenly distributing the flow of liquid phase in the group of plates with river flows, made by any of the standard schema.

The amount of free space near the ends of the plates is a buffer zone 7, in which the mixing and redistribution of the flow of gas streams.

The work of the mass exchange apparatus is implemented as follows (the example of a piece of apparatus with a three-flow Assembly of the plates, see figure 5).

The gas phase enters the buffer zone 7(a), located at the edge of the plates, is redistributed into three equal flow and mesterolone spaces takes place in the buffer zone 7(b), located at the opposite end of the plates, where again mixed in the stream, which flows into the upstream Assembly of plates.

Liquid phase enters the distribution-overflow device 6(a), located at the edge of the plates, which is divided into three equal flow, each of which is supplied on a separate plate, passes through mesterolone space on the opposite edge of the plate and through the side of the overflow of 3 falls into the following distribution-overflow device 6(b), in which the streams are mixed and the newly redistributed on the downstream Assembly of plates.

In its motion for mesterolone space gas flow encounters the no obstacles in the form of flow restrictors 5, who goes around, passing from above, through the gaps 8 upstream corrugated plane. Equal to the magnitude of the gaps 8 over limiters 5 across the width of the plate 2 (see figure 3) provides a uniform distribution of gas flow across the width of the plates. The increase in the cross-section of the gas stream after passing through the limiter has the effect of throttling, which provides a gas flow turbulization, intense wave generation on the surface of the liquid mirror and transverse mixing of the gas flow, which increases when placing constraints 5 at an angle to each other (see figure 2). All these factors increase the interaction of the gas and liquid phases in the areas of the plates, located between the limits, and provide the same deviation of the composition of phases from nonequilibrium across the width of the plates.

In its motion for mesterolone space liquid stream encounters obstacles such as limiters threads 5, which goes around, passing from below through the gaps 9 downstream corrugated plane. The differential gas pressures on both sides of the stopper together with the hydrodynamic flow resistance in the gaps provide an increased level of the liquid mirror before limiter (in the direction of the fluid). Due to the horizontal position of the plates in paperasserie is the uniform distribution, under the action of gravity, fluids, originally coming from one or more points of discharge, across the width of the plate, which is maintained in the future. Equal to the magnitude of the gaps 9 under limiters 5 across the width of the plate 2 provides a uniform flow of fluid across the width of the plates. Intense wave generation in the areas between the limits provides an extensive surface contact of gas and liquid phases, intensive mixing of the liquid in the vertical and transverse directions and regular wetting and update film of liquid phase on the bottom surface of the upper plane.

If necessary, through the limiter 5 is skipped, the flow of coolant, which provides uniform heating or cooling of the gas and liquid phases in the system.

The flows in countercurrent movement of the same phase on adjacent plates (see figure 4) is carried out similarly, except that the design of the device there are no distribution-overflow device and overflow liquid phase is produced directly from the plate on the plate.

1. Mass transfer apparatus for interaction of the gas with the liquid, consisting of a body located inside corrugated plates which are liquids flowing from one is on the edge of the dish on the opposite countercurrent to the direction of motion of the gas, characterized in that the ribs of the corrugations are arranged along the direction of flow of gas and liquid, the distance between the plates does not exceed 30 mm, and between the plates posted by rods or tubes, angled (90±15)° to the movement direction vector of threads.

2. Mass transfer apparatus according to claim 1, characterized in that the plates are arranged in groups of parallel plates located on a slope in the direction of the fluid, and a uniform distribution of the liquid on the plates when the flow of fluid from the group of plates on the downstream group of plates is carried out through the distribution and overflow devices.

3. Mass transfer apparatus according to claim 1, characterized in that the tubes located between the plates, can circulate the coolant.



 

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FIELD: chemical engineering.

SUBSTANCE: apparatus comprises groups of parallel rectangular plates with corrugated bottom. The ribs of the corrugation are oriented along the flow, and the distance between the plates does not exceed 30 mm. Between the plates, rods or pipes are arranged at an angle 90±15° to the vector of flows. The plates are assembled in groups of parallel plates inclined downstream. The uniform distribution of fluid over the plates when fluid flows from one plate group to another group is provided by means of distributing-overflowing devices.

EFFECT: decreased hydraulic drag.

2 cl, 5 dwg

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