Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1992-05-01
1993-04-20
Rivell, John
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
159 286, 202236, F28F 310, B01D 122
Patent
active
052034062
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a plate evaporator of the kind comprising a package of substantially vertically arranged heat transferring plates with plate interspaces, every second one of which forms an evaporation space for at least partial evaporation of a liquid and the rest of the plate interspaces forming condensation spaces for at least partial condensation of a heat emitting vapour, and further comprising sealing means which in the upper parts of those plate interspaces forming evaporation spaces delimit distribution chambers, each of which has several separate connections with at least one evaporation space, the heat transferring plates having through openings forming together an inlet channel for evaporation liquid, which extends through the plate package and communicates with the distribution chambers.
GB 1.299.481 shows a plate evaporator of this kind, in which heat emitting vapour is transported to the different condensation spaces in the plate package in the same manner as evaporation liquid is transported to the evaporation spaces, i.e. through a channel formed by aligned openings in the heat transferring plates.
Transportation of heat emitting vapour in this manner through a channel extending through the package of heat transferring plates has several disadvantages. One is that the openings in the heat transferring plates have to be very large for avoiding unnecessary pressure drop of the supplied vapour, which means that much plate material has to be removed from the heat transferring plates. Another disadvantage is that the area of the vapour inlet to each plate interspace forming a condensation space becomes relatively small, which creates an undesired pressure drop of the supplied vapour. A third disadvantage is that the pressure conditions at the vapour inlets to the various condensation spaces in the plate package will become different along the inlet channel through the plate package. This results in different temperatures prevailing in the various condensation spaces, and all of these, therefore, can not be used with the same efficiency.
All of these disadvantages may be avoided if the heat emitting vapour is instead introduced into the condensation spaces directly from the surroundings of the plate package through the slots formed between the edge portions of the heat transferring plates.
GB 1.568.733 shows a plate condenser in which the vapour to be condensed is introduced into every second plate interspace through the slots formed between the edge portions of the plates. In this case the other plate interspaces form no evaporation spaces but closed passages for a cooling liquid. The passages are, thus, closed from the surroundings of the plate package by means of gaskets extending along the edges of the plates around the whole periphery thereof.
A main object of the present invention is to provide a plate evaporator of the initially described kind, in which liquid to be evaporated may be distributed effectively to the various evaporation spaces in the plate package as well as within each evaporation space across the whole width of the heat transferring plates and--simultaneously--the means necessary for obtainment of such a liquid distribution does not prevent heat emitting vapour from flowing into the condensation spaces from above through the slots formed between the upper edges of the heat transferring plates.
An object of the invention is also to provide a liquid distribution arrangement that makes it simple and inexpensive to produce plate evaporators of the kind here in question and that makes possible a safe operation and a simple maintenace service of this kind of plate evaporators.
These objects may be obtained in a plate evaporator of the initially defined kind, which is characterized in that at least two sealing means are arranged in the upper part of each condensation space, horizontally spaced from each other seen along the heat transferring plates, each of said sealing means delimiting between the heat transferring plates a transferring chamber which is closed from
REFERENCES:
patent: 3735793 (1973-05-01), Burberry et al.
patent: 4260013 (1981-04-01), Sumitomo
patent: 4373579 (1983-02-01), Jernqvist et al.
patent: 4978429 (1990-12-01), Sears et al.
Blomgren Ralf
Clausen Niels-Erik
Alfa-Laval Desalt A/S
Leo L. R.
Rivell John
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