GB2048108A

GB2048108A - Contact plate for heat-mass exchange apparatus

Info

Publication number: GB2048108A
Application number: GB7915409A
Authority: GB
Original assignee: Efremov Z Sint Kauchuka Im S V; MOSKOV INST TONKOI KHIM TEKHNO
Current assignee: Efremov Z Sint Kauchuka Im S V; MOSKOV INST TONKOI KHIM TEKHNO
Priority date: 1979-05-03
Filing date: 1979-05-03
Publication date: 1980-12-10
Also published as: GB2048108B

Abstract

A contact plate for heat-mass exchange apparatus which may be used in various branches of industry and in the production of polymeric materials, has a base 1 provided with at least one perforation 8 widening in one direction, its edge at the wide end contacting the apparatus walls 6. With a plate having a plurality of perforations 8, 9 the edges of the perforations 8 disposed along the periphery of the base contact the apparatus walls and the edges of adjacent perforations 9 contact each other, thus reducing the development of stagnant zones on the plate, decreasing its hydraulic resistance and improving the efficiency of heat-mass exchange. <IMAGE>

Description

SPECIFICATION Contact plate for heat-mass exchange apparatus The present invention relates to heat-mass exchange apparatus and more particularly to contact plates of such apparatus and may be used in chemical, food, microbiological, pharmoceutical and other industries. A contact plate may be most successfully used in the production of polymeric materials.

The primary object of the invention is to provide a contact plate for a heat-mass exchange apparatus, on which the possibility of development of stagnant zones will be precluded.

Another object of the invention is to improve the efficiency of the contact plate by lowering the hydraulic resistance of the plate and thereby reducing longitudinal mixing of the contacting phases.

These and other objects of the present invention are attained by the provision of a contact plate for a heat-mass exchange apparatus, comprising a plate base having at least one perforation for the passage of phases, widening at least in one direction, according to the invention the edge of the perforation with its widening end contacts the apparatus walls, thus allowing to considerably reduce the development of stagnation zones by the reduction of the area whereon polymeric material may settle. This, in turn, permits lowering of the hydraulic resistance of the plate and improving the efficiency of the process.

According to the invention, in a contact plate having a plurality of perforations in its base, the edges of the perforations disposed along the periphery of the base contact the apparatus walls with their widening ends, and the edges of adjacent perforations contact each other. This provides an increase in the active surface of the plate and an improvement in the operation thereof.

It is advisable that the edges of the perforations should contact each other so that the areas on the base between the perforations form ribs, this feature completely eliminating stagnation zones on the plate and reducing its hydraulic resistance to a minimum.

Thus, the herein-proposed contact plate for heat-mass exchange apparatus eliminates the possibility of development of stagnation zones, has a lower hydraulic resistance and provides a more effective heat-mass exchange process on account of the reduction of longitudinal mixing of the interacting phases.

The invention will now be described in greater detail with reference to a preferred embodiment thereof, taken in conjunction with the accompanying drawings, wherein:~ Fig. 1 is a diagrammatic view of a contact plate having one perforation; Fig. 2 is a diagrammatic view of a contact plate having a plurality of perforation; Fig. 3 is an enlarged partial top view of the contact plate as shown in Fig. 2; Fig. 4 is a diagrammatic view of a contact plate having a plurality of perforations widening at both ends; ends; Fig. 5 is a top view of the plate as shown in Fig.

4.

The herein-proposed contact plate is mounted in a column-type heat-mass exchange apparatus along its vertical extent thereacross and separates its volume into sections.

A contact plate comprises a base I (Figs 1-4) which is provided with one perforation 2, as is shown in Fig. 1, or with a plurality of perforations 3, as is shown in Figs 2-4.

Due to theirfrusto-conical shape the perforations 2 (Fig. 1) or 3 (Fig. 2) are widening in one direction, or, as is shown in Fig. 4 are widening in both directions, which is attained by making them in the shape of two frusto-cones connected with their smaller bases 4.

In a preferred embodiment of a contact plate having one perforation 2 (Fig. 1) its edge 5 with its upwardly widening end, that is from the upper surface of the base, contacts the apparatus walls 6 at; the lower surface of the base edge 7 of the perforation 2 may be disposed as shown in Fig. 1 or may contact the apparatus walls (not shown in the Figure).

In a preferred embodiment of a contact plate having a plurality of perforations 3 (Fig. 2), upwardly widening, as shown in Fig. 2, or upwardly and downwardly widening, as shown in Fig. 4, edges 8 of the perforations 3 disposed along the periphery contact with their widening ends the apparatus walls 6 and edges 9 of the adjacent perforations 3 (Fig. 3), the edges 8 of the perforations 3 contacting the apparatus walls only with one of its widening ends. In this case the edges 9 of the adjacent perforations 3 disposed in the base itself contact each other, as shown in Fig 3.As a result, zones 10 of the base I between the perforations 3 have a small area on which polymeric material practically does not settle, because in the counter-current flow of the interacting phases settling particles are caught by them, carried up to the upper sections and do not upset the technological process taking place in the apparatus.

The edges 9 (Fig. 4) of the adjacent perforations 3 may contact each other with their widening ends so that the zones between these perforations form ribs II (Fig. 5). For this purpose the smalled base of the frusto-conical portion of the perforation, instead of being round, is made in the form of a square or of a rectangle, as shown in Fig. 5. In this case the like sides of the square or of rectangle coincide and as a result of this the zones of the base between the perforations 3 are presented by the ribs 11. The square or rectangular shape of the perforations 3 disposed along the base periphery close to the apparatus walls take the shape of these walls, as shown in Fig. 5, and the edges of the perforations contact adjacent perforations along straight lines -the ribs II.

In the process of operation of a column heat mass exchange apparatus provided with such contact plates interacting phases pass through the perforations 2 (Fig. 1) or 3 (Figs 2 - 5) in a counter-current flow. Thus, an intensive interaction of the phases is accomplished not only over the contact plates in the sections, but also in the perforations 2 and 3. During this interaction process the settling of polymeric material on the base zones 10 (Figs. 3) or on the ribs II (Fig. 4) does not take place, because their area is small in comparison with the diameters of these perforations even in their narrow portions, and all the settling particles are carried away by the interacting phases to the upper sections.

Claims

1. A contact plate for heat-mass exchange apparatus, comprising a base with at least one perforation for the passage of phases, widening at least in one direction, the edge of said perforation with its widening end contacting the apparatus walls.

2. A contact plate as claimed in Claim 1, comprising a base provided with a plurality of perforations the edges of said perforations disposed along the periphery of said base with their widening ends contacting the apparatus walls, and the edges of adjacent perforations contacting each other.

3. A contact plate as claimed in Claim 2, wherein said edges of said perforations contact each other so that zones of said base between said perforations form ribs.

4. A contact plate for heat-mass exchange apparatus substantially as described hereinabove with reference to the accompanying drawings.