Film-distributing device of tube-type down-flow evaporator

Abstract

The invention discloses a cloth membrane device of a long-tube falling film evaporator, which comprises an upper tube sheet arranged in the housing of the evaporator, a plurality of lower support rods arranged on the upper tube sheet, and a distribution tray arranged at the upper end part of the lower support rod, wherein a plurality of distribution holes which are evenly distributed and communicated from top to bottom are formed on the distribution tray, and cloth membrane apparatus is arranged in the distribution holes; a lap of check rings are arranged on the distribution tray, and a plurality of support rods are formed on the distribution tray; an overfall tray is arranged on the support rods and a connecting pipe is arranged at the middle of the overfall tray; and a lap of overflow dam is arranged at the periphery of the overfall tray, and a corresponding overflow pipe is arranged at the middle part of the distribution tray which corresponds to the connecting pipe. The cloth membrane device has the advantages of simple structure and evenly distributed cloth membrane; besides, no dry film and split film are generated in a heating pipe, so that the service life of the long-tubefalling film evaporator can be prolonged.

Description

technical field [0001] The invention relates to a tube type falling film evaporator, in particular to a film distribution device for the tube type falling film evaporator used in the alumina industry. Background technique [0002] The film distribution device is one of the core devices of the tubular falling film evaporator. The function of the film distribution device is to evenly distribute the liquid to be evaporated into the tube evaporator for evaporation, so that the dissolved substances in the liquid are crystallized. The structure of the film distribution device of the traditional tube-type falling film evaporator usually includes: an upper tube plate arranged in the evaporator shell, and the upper tube plate and the upper tube plate in the evaporator shell are used to fix the tubular heat exchange tubes. A number of lower support rods on the upper tube plate are arranged on the distribution plate at the upper end of the lower support rod. The distribution plate is p...

AI Technical Summary

Problems solved by technology

The film distribution device of this three-layer tubular falling film evaporator has a relatively large structure, takes up a large space, is troublesome to install and maintain, and is prone to fluid superposition during the liquid distribution process, resulting in fluid in the heating tube. The bias flow, resulting in dry film and broken film in the heating tube

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