Film distribution device in falling-film evaporator for concentration of caustic soda and caustic soda flakes

Abstract

The invention discloses a film distribution device in a falling-film evaporator for the concentration of caustic soda and caustic soda flakes. The film distribution device comprises a falling-film concentration pipe, wherein the upper end of the falling-film concentration pipe extends into a soda liquor inlet pipe box, a soda liquor inlet is formed on the soda liquor inlet pipe box, and a plurality of film distribution grooves are uniformly formed in the circumference of the upper end part of the falling-film concentration pipe in the soda liquor inlet pipe box, penetrate through the wall of the falling-film concentration pipe and are arranged along a same rotation direction tangent to the falling-film concentration pipe. The film distribution device disclosed by the invention has the advantages that the structure is simple and practical; as the film distribution grooves are formed along the tangent direction of the falling-film concentration pipe, even if the flow velocity of soda liquor is high, a film also can be distributed well on the inner wall of the falling-film concentration pipe by the soda liquor, so that the film distribution effect is greatly improved.

Description

technical field [0001] The invention relates to a falling film evaporator, in particular to a film distributing device in the falling film evaporator used in the concentration process of caustic soda and caustic soda. Background technique [0002] The traditional film distribution device in the falling film evaporator used for the concentration of caustic soda and flake soda includes: the falling film concentration tube, the upper end of the falling film concentration tube extends into the lye inlet pipe box, and the lye inlet pipe box is set There is a lye inlet, and a number of film cloth grooves are evenly arranged on the circumference of the upper end of the falling film concentration pipe located in the lye inlet pipe box, and each film cloth groove runs through the pipe wall of the falling film concentration pipe, and all along the falling film concentration pipe Radial arrangement of concentrator tubes. The working principle of the film cloth device in the traditiona...

AI Technical Summary

Problems solved by technology

The disadvantage of the traditional film distribution device in the falling film evaporator used for the concentration of caustic soda and flake soda is that the structure of the film distribution tank arranged radially along the falling film concentration tube requires that the flow rate of the lye must be relatively slow. Fast, the lye is easy to rush to the middle of the falling film concentrator, resulting in poor film distribution on the inner wall of the falling film concentrator

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