SU1452537A1 - Counter-current contact tray - Google Patents

Abstract

The invention relates to instrumentation of heat and mass transfer processes in a gas (vapor) - liquid system and can be used in the chemical, petrochemical, and other industrial sectors. The purpose of the invention is the intensification of heat and mass transfer due to the directional introduction of gas into the liquid, the ordered flow of the liquid and the increasing homogeneity of the gas-liquid layer. The countercurrent contact plate contains a base perforated with large holes. A grille is installed above the base, formed by vertical partitions having slots in the lower part. The cut-out areas are bent obliquely towards the base. The junctions of the partitions coincide with the centers of the holes. The slots are arranged symmetrically with respect to the edge of the hole. One slot is located directly above the hole, and the other - above the base. Above each sector of the hole, bounded by intersecting vertical partitions, is one bent portion. Each pair of cor holes in the corners of the holes is bent in opposite directions. Above the two diametrically opposite sectors of each hole there may be two sections bent by slots. In addition, each pair of adjacent holes in the vicinity of the sectors have two bent sections above one sector, and there are no bent sections above the other, 4 Cp. f-ly, 4 ill. S (L; l GCHD ate C4)

Description

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  1452537 Isobre- gesh relates to apparatus for the design of heat and mass transfer processes in gas systems (vapor) —liquid and can be used in the chemical, petrochemical, and other industries. The purpose of the invention is the intensification of heat and mass transfer due to the direction of gas injection into the liquid, the stop - and the “liquid drain” and the increase in homogeneity of the fluid – gas layer.

Fig. 1 shows a countercurrent contact plate, longitudinal section; figure 2 - plate with a single bent section over each sector of the hole, top view; on fig.Z - plate with areas, bent in opposite directions; in I of Fig. 4, a plate with two bent sections above opposite sectors of the hole, top view.

The countercurrent contact plate contains a base 1, perforated with 25 I large holes 2. Above the base is; At 1, a lattice formed by vertical partition walls 3, having slots 4 and 5 in the lower part, is cut from the lower part I sections 6 are bent down toward the base of i. The junction points of partitions 7 I coincide with the centers of 8 holes 2 Slices 4 and 5 are located symmetrically with respect to the edge 9 of aperture 2, and the bent sections 6 are symmetrically relative to the center 8 of aperture 2. One of the slits 4 is located directly over the aperture 2, and the other, aperture 5 base 1. Over each sector hole 2, bounded by the cross Also, by vertical partitions 3, one bent section 6 is located. In addition, for each pair of adjacent holes 2, sections 6 and 10 bounded by slits 4 and 5 are bent in opposite directions.

Above the two, the diametrically opposed gas is fed to the plate from the bottom and passes through the holes 2 in the base 1 of the dish. Due to the presence of sections 6 angled to the bottom of the plate, gas is introduced into the gas-liquid. bone layer in the direction close to horizontal. The liquid enters the plate from the top of the recessed plate. When gas and liquid interact, a gas-liquid layer is formed above the base 1 of the tray. The presence of the lattice of the vertical partitions 3 contributes to the stabilization of the gas-liquid layer. The fluid in the cells formed by the vertically arranged partitions 3 communicates between the cells through the windows formed by the bent sections and the slits 5 above the base of the first tray I. Due to the presence of intersections 3 in the center 8 of each opening, the drainage flow is stable and occurs in the center of each opening 2.

The gas stream enters the bottom of the hole 2, interacts with the draining fluid and enters the bent sections 6 and 10. In this case, the gas stream contacts the liquid flowing through the hole formed by the base 1 of the tray, the slot 5 and the bent section 6. The interaction of two moving streams gas and liquid, leads to a significant intensification of the process of heat and mass transfer due to the turbulization of the gas-liquid layer and an increase in the contact surface of the phases. By introducing gas into the gas-liquid layer in a direction close to the horizontal, the splash abatement is reduced. The installation of the lattice contributes to the homogeneity of the gas-liquid layer. Above each hole sector, bounded by intersecting vertical partitions.

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Positive sectors of each hole 3, is one of the bent bounds of 9 MPP ..- G. .. o. „..„ „„. "... 50 ejjj slits area 6. This contributes to closing the gas-liquid flow over the hole, which leads to an intensification of the process of heat and mass transfer.

Each pair of adjacent holes 2, limited by slots 4 and 5, sections 6 are bent in opposite directions. When this occurs, the collision

2, there may be two bent, cut-off slots 4 and 5 of section 6. Each pair is located: adjacent sectors of adjacent holes. Two sectors of bent section 6 are located above one sector, but not over another.

The plate works as follows.

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52537 - h, „

25, Gas is supplied to the plate from the bottom and passes through the holes 2 in the base 1 of the plate. Due to the presence of sections 6 bent at an angle to the base of the plate, gas is introduced into the gas-liquid. bone layer in the direction close to horizontal. The liquid enters the plate from the top of the recessed plate. When gas and liquid interact, a gas-liquid layer is formed above the base 1 of the tray. The presence of the lattice of the vertical partitions 3 contributes to the stabilization of the gas-liquid layer. The fluid in the cells formed by the vertically arranged partitions 3 communicates between the cells through the windows formed by the bent sections and the slits 5 above the base of the first tray I. Due to the presence of intersections 3 in the center 8 of each opening, the drainage flow is stable and occurs in the center of each opening 2.

The gas stream enters the bottom of the hole 2, interacts with the draining fluid and enters the bent sections 6 and 10. In this case, the gas stream contacts the liquid flowing through the hole formed by the base 1 of the tray, the slot 5 and the bent section 6. The interaction of two moving streams gas and liquid, leads to a significant intensification of the process of heat and mass transfer due to the turbulization of the gas-liquid layer and an increase in the contact surface of the phases. By introducing gas into the gas-liquid layer in a direction close to the horizontal, the splash abatement is reduced. The installation of the lattice contributes to the homogeneity of the gas-liquid layer. Above each hole sector, bounded by intersecting vertical partitions.

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3, there is one bent limiting 0 ejjj slits section 6. This contributes to the closing of the gas-liquid flow over the hole, which leads to an intensification of the process of heat and mass transfer.

gas-liquid flows emerging from under them and their significant turbulization, which contributes to an increase in the intensity of heat and mass transfer.

In the case where, over the two diametrically opposite sectors of each hole 2, there are two bent bent grooves 4 and 5 of section 6 bent, there is a collision of gas-liquid jets coming out, thus increasing the heat and mass transfer surface, and hence the intensity of mass transfer increases. At the same time, there are no bent sections 6 above the other two diametrically opposite sectors of the openings 2, which favors the predominant runoff of liquid through these sectors. This makes it possible to order the drain of liquid from the plate, which contributes to an increase in the uniformity of the gas-liquid layer over the cross section of the plate, and hence to an increase in the efficiency of mass transfer.

In the case when each pair of adjacent holes 2 in the vicinity of the sectors have two bent bounded slots 4 and 5 of section 6 bent over them, but not others, there is a uniform distribution of gas and liquid over the cross section of the plate, since in each the cell formed by vertical partitions 3 is evenly alternated with areas with a predominant gas inlet and a preferential discharge of liquid. This leads to the alignment of the gas-liquid layer over the cross section of the plate and an increase in the efficiency of heat and mass transfer.

By introducing gas into the gas-liquid layer on the plate at the place of liquid flow between the cells formed by vertical partitions, twisting the gas-liquid layer around each hole and the ordered liquid flow increases the homogeneity of the gas-liquid layer, increasing the use of the proposed contact plates in the mass transfer equipment will increase by 8- 14% mass transfer efficiency and 1.4-1.6 times lower sprinkling compared to conventional large hole trays. When this hydraulic resistance increases slightly.

The proposed plate is recommended for operation in polluted environments.

Claims (5)

1. An anti-current contact plate containing a base, perforated with large holes, a grid installed at the top, formed by vertical partitions having slots in the lower part, the sections limited by the slits being bent obliquely to the base, and the junction of the partitions coincide with the centers of the holes, which differ from We note that, in order to intensify the heat and mass transfer due to the directional introduction of gas into the liquid, the ordered flow of the liquid and the homogeneity of the gas-liquid layer are The vena is symmetrical with respect to the edge of the hole, while One of the slits is located directly above the holes, and the other is above the bottom of the plate. , 2. A pop-dish 1, characterized in that, above each sector of the aperture bounded by intersecting vertical partitions, one portion of the slits is bent. U 3. Plate pop. 1, characterized by the fact that each pair of adjacent holes has a limited opening. The plots are bent in opposite directions. 4. The plate according to claim 1, about t and h ayu The range of stable operation gQ Sch is affected, with the fact that the process is intensified over two diameters and mass transfer. The collision of gas-liquid jets emerging from under the bent sections, or when the jets hit the surface of vertical partitions, increases the surface of the contact phase, and hence the efficiency of the process of heat and mass transfer. 55 The two opposite slots of the section are bent by opposite sectors of each hole. 5. A plate according to claim 4, characterized in that the diametrically opposite sectors with the two bent bounded slotted areas are equally located at the adjacent holes. five The two opposite slots of the section are bent by opposite sectors of each hole. 5. A plate according to claim 4, characterized in that the diametrically opposite sectors with the two bent bounded slotted areas are equally located at the adjacent holes. Fiz. i FIG. 2 Thebes.3 y-v Yu /.-2 Phage.4