Liquid distributor for evaporator

Details Liquid distributor for evaporator Liquid distributor for evaporator

B - Operations, Transporting

01

D

B01D 1/30 (2006.01) B01D 1/22 (2006.01) B01D 3/00 (2006.01) D21C 11/10 (2006.01) F28F 27/02 (2006.01) B01F 5/06 (2006.01)

Patent

CA 2229486

The invention relates to a liquid distributor for an evaporator, particularly meant for a film evaporator treating liquid suspensions containing solids. The distributor comprises a channel array (3, 4) that distributes the liquid (8) fed in at the sides of the evaporator to the top of the heat transfer surface (5), over the whole width thereof. The channel array is formed of at least one transversal supply channel (3) and of a number of distribution channels (4) departing downwards from the supply channel and leading to the heat transfer surface (5). The invention is characterized in that each distribution channel (4) is provided, on its side located downstream with respect to the supply channel flow (8, 11), with a step-shaped expansion (14) bordered by a sharp point (15), the purpose of said expansion being to prevent liquid suction created in the channel due to the effect of siphonage. The junctions (9) of the supply channel (3) and the distribution channels (4) can be provided with rounded division surfaces (12), on which the liquid is distributed into the channels at each instant, and under which the step-shaped expansions (14) start.

L'invention se rapporte à un distributeur de liquide conçu pour un évaporateur, et particulièrement destiné à un évaporateur pelliculaire servant à traiter des suspensions liquides contenant des solides. Ledit distributeur comporte un ensemble de canaux (3, 4) qui permettent de répartir le liquide (8), dont l'alimentation se fait par les côtés de l'évaporateur en direction de la partie supérieure de la surface (5) de transfert thermique, sur toute la largeur de ladite surface. L'ensemble de canaux est constitué d'au moins un canal d'alimentation transversal (3) et d'un certain nombre de canaux de distribution (4) descendant du canal d'alimentation vers la surface (5) de transfert thermique. L'invention se caractérise en ce que chaque canal de distribution (4) est pourvu, du côté situé en aval par rapport au flux du canal d'alimentation (8, 11), d'une extension en forme de gradin (14) bordé par une pointe (15) dont le but est d'empêcher l'aspiration de liquide qui se produit dans le canal sous l'effet du siphonnement. Les raccordements (9) du canal d'alimentation et des canaux de distribution (4) peuvent comporter des surfaces de séparation arrondies (12), sur lesquelles le liquide est réparti à l'intérieur des canaux à tout instant, et sous lesquelles les extensions en forme de gradin (14) prennent naissance.

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