Heat exchange element for a film heat exchanger and a method...

B - Operations – Transporting – 29 – C

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Details

B29C 51/10 (2006.01) B01D 1/22 (2006.01) B29C 49/00 (2006.01) F28D 3/00 (2006.01) F28D 9/00 (2006.01) F28F 3/14 (2006.01) F28F 21/06 (2006.01)

Patent

CA 2278305

The invention relates to a heat exchange element (1) for a film heat exchanger intended for distillation or for the evaporation of solutions or suspensions, and to a method for manufacturing the same. The substantially bag-like element is formed by bonding from oppositely positioned plastic heat exchange films (2), evaporation of liquid taking place on the exterior surfaces of the films and condensing of the obtained vapor taking place on the interior surfaces. In the bonding the interior (4) of the element is divided into ducts to direct the travel of the vapor, and according to the invention the films are at the same time stretched in the intervals between the bonding points (3) in order to provide leeway for bulging during the pressurization of the interior of the element. The element (1) may be made up of two heat exchange films (2) stretched by means of heat and a pressure differential between the different sides of the film, the films being bonded directly to each other, or there being bonded, between the heat exchange films to be stretched, one or more straight support films to improve the loadbearing capacity of the element.

L'invention concerne un élément d'échange thermique (1) pour échangeur de chaleur à feuilles, destiné à la distillation ou à l'évaporation de solutions ou de suspensions, et un procédé de fabrication correspondant. L'élément a sensiblement la forme d'un sac, et il est constitué par collage de feuilles (2) opposées d'échange thermique en plastique, l'évaporation du liquide intervenant sur les surfaces extérieures des feuilles et la condensation de la vapeur obtenue intervenant sur les surfaces intérieures. Au cours du collage, on divise l'intérieur (4) de l'élément en conduits pour guider l'acheminement de la vapeur et, par ailleurs, les feuilles sont étirées dans les intervalles entre les points de collage (3) de manière à ménager une marge de bombement lorsque l'intérieur est mis sous pression. L'élément (1) peut comprendre deux feuilles (2) d'échange thermique étirées sous l'effet de la chaleur et d'un écart de pression entre les différents côtés des feuilles, et le collage entre les deux feuilles peut être direct, ou bien indirect avec interposition entre les deux feuilles à étirer d'une ou plusieurs feuilles supports rectilignes qui permettent d'améliorer la capacité de l'élément à supporter des charges.

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