Heat exchange element and a heat exchanger made up of the same

F - Mech Eng,Light,Heat,Weapons – 28 – B

Patent

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Details

F28B 9/08 (2006.01) B01D 1/22 (2006.01) F28D 3/00 (2006.01) F28D 9/00 (2006.01) F28F 21/06 (2006.01)

Patent

CA 2277866

The invention relates to a heat exchange element (1) which is made up of a bag of a film material, such as plastic film, and to a heat exchanger made up of such heat exchange elements, the heat exchanger being suitable, for example, for the evaporation of effluents which contain solid matter, such as effluents from bleaching. The transfer of heat takes place in the bags (1) from a vapor condensing in the interior (3) of the bags to a liquid evaporating on their exterior surfaces (2). The forming evaporated vapor may be recycled via a compressor to the interior of the bags as heating vapor so that the heat exchanger will function as a distillation apparatus. According to the invention there is bonded inside the bag (1) a planar condensate-removal member, substantially narrower than the bag, for example, a circular disc (9) to which the forming condensate is arranged to flow and in which there is formed a hole (13) and at least one condensate outlet duct (8) leading to it, the film material of the bag being pierced in the area of the hole on each side of the condensate-removal member. In the heat exchanger, which has oppositely positioned bags (9) tied to form a pack, the condensate-removal members (9) are located one against another, and the apertures pierced in the film material form a condensate-collection duct common to them. The condensate-removal members being narrower than the bags enables the solid matter from the suspension being evaporated to be removed by falling through the spaces between the bottoms (10) of adjacent bags.

L'invention concerne un élément échangeur thermique (1) constitué d'un sac en matériau pelliculaire, tel qu'un film plastique, et un échangeur thermique constitué desdits éléments échangeurs thermiques, convenant, par exemple, pour l'évaporation d'effluents contenant des matières solides, tels que des effluents de blanchiment. Le transfert de chaleur se produit dans les sacs (1) à partir de la vapeur qui se condense à l'intérieur (3), de façon à former un liquide qui s'évapore sur leurs surfaces externes (2). La vapeur évaporée qui se forme peut être ramenée à l'intérieur des sacs, via un compresseur, sous forme de vapeur de chauffage, de façon que l'échangeur fonctionne comme un appareil de distillation. Selon l'invention, à l'intérieur du sac (1) est collé un élément plan d'élimination du condensat, sensiblement plus étroit que le sac, par exemple un disque circulaire (9), vers lequel s'écoule le condensat qui se forme et qui présente un orifice (13) avec au moins un conduit de sortie (8) du condensat, le matériau pelliculaire du sac étant percé dans la zone de l'orifice de chaque côté de l'élément d'élimination du condensat. Dans l'échangeur thermique, qui comprend des sacs opposés (9) reliés de façon à former un ensemble, les éléments d'élimination (9) du condensat sont disposés les un contre les autres, et les orifices creusés dans le matériau pelliculaire forment un conduit commun pour la collecte du condensat. Les éléments d'élimination du condensat sont plus étroits que les sacs, de façon à permettre l'évaporation des matières solides de la suspension, qui s'éliminent en tombant par les espaces situés entre les bases (10) des sacs adjacents.

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