Heat transfer plates evaporation and condensation apparatus

Details Heat transfer plates evaporation and condensation apparatus Heat transfer plates evaporation and condensation apparatus

1992-05-01

1993-08-03

Bascomb, Jr., Wilbur

Distillation: apparatus

Apparatus

Systems

202177, 202202, 202266, 2022671, 202269, 159 241, 159 286, 159DIG15, 159DIG31, 159DIG42, 203 11, 203 22, 203 23, 203 26, B01D 128, B01D 302

Patent

active

052325571

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns an apparatus for at least partial evaporation of a liquid by means of a heat emitting vapour which is brought into indirect contact with the liquid and which, thereby, is at least partly condensed, said apparatus comprising a package of heat transfer plates which between themselves define plate interspaces and, together with sealing means extending along the edges of the heat transfer plates, form an evaporation passage in every second plate interspace and condensation passages in the rest of the plate interspaces, the heat transferring plates further having through openings forming an inlet channel through the plate package for the supply of liquid into the evaporation passages.
In GB 1.299.481 there is shown an apparatus of this kind in which heat emitting vapour as well as vapour generated within the apparatus are conducted to the condensation passages and from the evaporation passages, respectively, through channels extending through the plate package and formed by aligned openings in the heat transfer plates.
Transportation of heat emitting and generated vapour, respectively, in this manner through channels extending through the package of heat transfer plates has several disadvantages. One is that the openings in the heat transfer plates have to be made very large for avoiding unnecessary pressure drops of the transported vapours, which means that much plate material has to be removed from the heat transfer plates. Another disadvantage is that the area of the vapour inlet to every condensation passage, as well as the area of the vapour outlet from each evaporation passage, becomes relatively small, which creates undesired pressure drops of the vapours. A third disadvantage is that the pressure conditions at the vapour inlets to the various condensation passages and at the vapour outlets from the various evaporation passages will be different along said channels in the plate package, which results in different temperatures prevailing in the various condensation passages and in the various evaporation passages. This means that the heat transfer will not be of the same efficiency in all parts of the plate package.
The object of the present invention is to provide an apparatus of the initially defined kind which is free of the above mentioned disadvantages connected with an apparatus according to GB 1.299.481 and which can be made more effective than this.
This object may be obtained in an apparatus of the initially defined kind, which is characterized in that the package of heat transfer plates is arranged in a container, that a partition means divides the interior of the container in two separate chambers in a way such that each heat transfer plate has one part of its surrounding edge situated in one of the chambers and another part, preferably the rest, of its surrounding edge situated in the other chamber, that the sealing means between the heat transfer plates are formed such that the evaporation passages are closed from communication with one of the chambers but communicate with the other chamber along the edges of the heat transferring plates, whereas the condensation passages communicate with said one chamber along the edges of the heat transfer plates but are closed from the other chamber, and that said one chamber has an inlet for heat emitting vapour and the other chamber has an outlet for vapour generated from said liquid.
Firstly, it is made possible by the invention that the inlets of the condensation passages are made very large and, thereby, that a relatively low flow velocity of the heat emitting vapour may be maintained in these inlets. This means that the vapour is subjected to a relatively small pressure drop and, thus, a relatively small undesired temperature drop caused thereby in connection with its entering the condensation passages.
Secondly, it is made possible by the invention that the outlets of the evaporation passages are made very large and, thereby, that a relatively small flow resistance arises for the generated vapour in these outlets. This

REFERENCES:
patent: 3155565 (1964-11-01), Goodman
patent: 3984281 (1976-10-01), Buchwald
patent: 4640740 (1987-02-01), Moore et al.
patent: 4671856 (1987-06-01), Sears
patent: 4673459 (1987-06-01), Elmore et al.
patent: 4808262 (1989-02-01), Aneja et al.

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