Regular packing for heat-and-mass exchange apparatuses

FIELD: process engineering.

SUBSTANCE: invention relates to heat-and-mass transfer processes in gas-fluid system, for example, rectification, absorption, cleaning and drying of natural gas. Regular packing consists of corrugated sheets assembled in packs and arranged vertically with crimp vertices directed toward each other. Two types of sheet are incorporated therewith and alternating therein. First-type sheet has cutouts made at crimp vertex edges. Besides, there are minor horizontal sites. Second-type sheets feature cutouts made at crimp vertex. As-assembled, corrugated sheets form horizontal rhombic, vertical and zigzag channels.

EFFECT: higher intensity of processes.

4 dwg

 

The technical field to which the invention relates.

The invention relates to constructions of regular nozzles used for the heat and mass transfer processes in the gas (vapor) - liquid, such as a process of distillation, absorption, adsorption of natural gas, and may also find application in technological processes in the chemical, oil, gas and other industries.

The level of technology

In the patent 0130745 A2 (EP IPC F28F 25/08, B01D 53/18, F28C 1/02, publ. 21.06.84) described structured packing made of vertically mounted corrugated sheets in contact protruding corrugations with each other. Corrugations adjacent adjacent sheets are made diagonally in opposite directions. Sheets are made with holes or slots, in the form of arches, curved triangles, rectangles or chetyrehlistnik located on the sides of the corrugation.

The technical result is to increase the efficiency of the nozzles used for heat and mass transfer processes.

In common with the proposed design of the nozzle is the presence of the corrugated sheets, arranged vertically, with their holes and slots.

The design of this nozzle is not possible to fully ensure the effectiveness of heat and mass transfer processes is a consequence of the uneven distribution of flow and underdeveloped contact surface phases.

From the patent for useful model 77406 (IPC RU F28C 3/06, publ. 12.02.2008) known regular nozzle, consisting of a series of vertically expanded metal sheets. Expanded metal sheets Gavrilovna and is located in the nozzle vertices to each other with the formation of the horizontal channels.

In common with the proposed design of the nozzles are corrugated sheets collected in bags and placed vertically in such a way as to form horizontal channels.

The lack similar to the previous version.

Known structured packing "ABP". Copyright to the nozzle "ATS" LLC has "NT Oil and Gas". Design and principle of operation of this nozzle is described in detail on the web site [http://www.ntng.ru]. Attachment "ATS" consists of a block formed zigzag partitions forming in the planes of the contact channels of the vertical grids. At the contact interface is the fragmentation of the liquid.

In common with the proposed design of the nozzle is the presence of corrugated sheets forming vertical channels.

The disadvantage of such constructions regular nozzles is low efficiency in environments with increased pollution and prone to sludge formation, which is associated with the presence of mesh material between the corrugated plates.

Most near the Oh (prototype) of the present invention to the technical essence and the achieved result is a regular nozzle, described in [Nev. Machinery and equipment of chemical productions. Publishing house engineering, 1989, p.98-99].

Known structured packing consists of vertical corrugated metal sheets. The leaves have the same shape with closely defined by the bending angle and pitch of corrugation. Corrugated sheets are located at the same distance from each other and form a zig-zag vertical channels. Leaves gather in packs and are installed in the mass transfer apparatus. The principle of the process is the following: the fluid entering the upper portion of the apparatus, flows through the zigzag vertical channels down. Gas (vapor), entering from the bottom of the apparatus rises. As a result, the cap film is formed, the contact area of the phase at which the mass transfer occurs between the liquid and gas (vapor).

The overall design of this nozzle and the present invention is the presence of a vertically mounted corrugated sheets.

The lack similar to the previous version.

The objective of the invention is to provide a new high-performance regular nozzle for conducting heat and mass transfer processes.

The technical result

The technical result of the invention consists in the

- efficiency nozzles and intensity of the processes of heat and mass transfer,

- is the reduction of overall dimensions of the apparatus and, as a consequence, reducing the capital cost of its manufacture.

Brief description of drawings

Figure 1 shows a regular nozzle for heat and mass transfer apparatuses;

figure 2 - corrugated sheets regular packing;

figure 3 - the motion of the gas and liquid through the nozzle;

figure 4 - laboratory setup for testing nozzles.

Figure 1 shows the design of the regular packing for heat and mass transfer apparatus. Figure 2 shows the design of the corrugated sheets to the regular packing. Figure 3 provides a diagram of the movement of gas and liquid through the nozzle. Figure 4 provides a laboratory setting for testing nozzles.

Disclosure of inventions

Eliminate these drawbacks and achieve the claimed technical result from implementation of the regular packing, designed to conduct heat and mass transfer, consisting of collected packets corrugated sheets are installed vertically, the peaks of the corrugation to each other, reach due to the use of corrugated sheets of two kinds, installed alternately, the sheets are interleaved with each other and the sheets have been cut so that made possible the entrance of the peaks of the corrugation of the sheet of the first type, the grooves on the tops of the corrugation of the sheet of the second kind with the formation of gaps between them (figure 1). On the tops of the corrugation of the sheets of the first type have by a small horizontal platform, and assembled corrugated sheets form a horizontal, diamond-shaped channels and vertical zigzag channels.

Comparative analysis of the prototype and the claimed invention shows that a common structural characteristic are installed vertically corrugated sheets.

The distinguishing feature of the claimed invention is that the nozzle consists of sheets of two kinds. On the tops of the corrugation of the sheets of the first type has a small horizontal platform, and the tops of the corrugation of the second kind are the slots, when assembling the tops of the corrugation of the sheet of the first type and cut of the corrugation of the sheet of the second type are formed slits.

The essence of the proposed regular packing is illustrated in the drawing (figure 1). The nozzle uses the leaves of two species 1 and 2 (figure 1), which are arranged alternately. The bending angle α of the corrugated sheets may be different, figure 1 shows an image of the nozzle, is made with a bend angle α equal to 90°. It is possible to use nozzles with a bend angle of 60 to 120°. The angle is selected depending on the conditions of flow of heat and mass transfer, that allows you to ensure the most effective implementation of processes.

In the corrugated sheet 1, as shown in figure 2, there are cut-outs 7. The cutouts 7 are made on the edges of the corrugation peaks and have the same shape. Also on the tops of the corrugation imets is a small horizontal platform 3, speakers at 5-10 mm Pad 3 are formed by flattening a small area of the peaks of the corrugations. Platform 3 can be located not only horizontally, but with a slight slope (10°) up. The location of the site with a slope will help to maintain a constant liquid level in the horizontal channels of the diamond shape. In addition, site 3 may have a straight profile, and zigzag, which allows fluid to flow from the site is not solid flat jet, and many small streams, this will improve the efficiency of mass transfer. Corrugated sheet of the second type 2, shown in figures 1 and 2, is made as follows: in the tops of the corrugation done by perforation slits 4. The slots have the same shape. The dimensions of the slits 4 may vary and be selected depending on properties of the medium, the liquid flow rate and gas (steam). When processing contaminated environments when possible plugging and coking, the size of the slots can be increased. This design corrugated sheets allows joining of sheets of the type 1 and 2 (figure 1). The coupling is as follows: the vertices of the corrugated sheet 1 is fixed in the grooves on the tops of the corrugation of the sheet 2 with the formation of the slits for the passage of gas and liquid. Assembled corrugated sheets form a horizontal diamond-shaped channels. Also this comp is mounting forms a vertical channel complex zigzag shape. To reduce the hydraulic resistance of the nozzle layer may make of slots along the sides of the corrugation on the sheet of the second kind. Figure 2 shows a corrugated sheet of the second kind with 8 done rents 9.

Diagram of the flow of gas and liquid is shown in figure 3. The liquid flows from the top down, accumulate in the lower part of the diamond-shaped channels and forming a flat jet at the end of the 3 sites (figure 2). The gas flows upwards in a zigzag channels, ejective liquid flowing from the 3 sites (figure 2). The interaction of gas and liquid is carried out in a diamond-shaped channels in the interaction between flows. At the expiration of site 3 (figure 2) first streams of liquid and gas move in parallel flow, and then hit the opposite wall, intensively mixed. This 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 regular nozzle operates as follows.

The flow of gas (steam) passes upward zigzag through the channels formed by the leaves of the nozzle (Fig 3.). The liquid flows from the top down. Fluid flow occurs as follows: the fluid flow is directed in a horizontal diamond-shaped channel 5 (IG) and partially fills it. Next, the liquid flows on the lower adjacent diamond-shaped channel at site 3 (figure 1). Thus, the entire package of corrugated sheets partially filled with liquid, and a certain level of liquid is always present in a diamond-shaped channels. This liquid flows zigzag, constantly changing direction, which contributes to the mixing and increase the intensity of heat and mass transfer. Gas (vapor) zigzag moves upwards. He cannot pass through the slots 4 (figure 1), because it prevents the fluid layer, which is always in the diamond-shaped channels, as well as some obstacle creates the tilt-up pad 3 (up to 10°). The gas rushes into the area 6 (figure 1), this captures the flowing liquid from sites 3, thereby creating the effect of ejection. Figure 3 illustrates in greater detail the circuit of the flows of gas and liquid.

The new nozzle was tested in a laboratory setup shown in figure 4. The laboratory setup consisted nozzle apparatus 10, the liquid reservoir 11, a balloon with gas (air) 12, the valves 13, 14, 15, 16. Package nozzle consisted of three corrugated metal sheets with a height of 0.15 m, a width of 0.10 m had three of the corrugations in each sheet, the bending angle of the corrugations was 90°. The step of corrugations was 0.05 m, the height of the corrugation of 0.03 M. the Experiments were carried out as follows: opened on sledovatelno valves 16, 13, 15, 14. Installed flow rate of 150 ml/s, and the gas flow rate is 1 l/s Through the transparent wall of the housing package nozzle, made of plexiglass, watched the flow of liquid and gas. The experiments confirmed possibility of working nozzles, proved that the nozzle ensures effective interaction of gas and liquid inside a diamond-shaped channels with the formation of the developed surface of the contact phase.

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

Regular nozzle for heat and mass transfer apparatus, consisting of packages of corrugated sheets, vertically, vertices to each other with the formation of the assembled horizontal, diamond-shaped channels, and vertical, zig-zag channels, characterized in that use two types of corrugated sheets that are installed in the package alternately, the sheets have been cut so that made possible the entrance of the peaks of the corrugation of the sheet of the first type into the grooves on the tops of the corrugation of the next sheet of the second kind with the formation of gaps between them, on the tops of the corrugation of the sheets of the first type are exposed horizontal platform, and the sides of the corrugation of the sheet of the second kind have slot.



 

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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

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EFFECT: enhanced efficiency.

3 cl, 4 dwg

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