Controllable water distributor and falling film concentrating machine using same

Abstract

The invention discloses a controllable water distributor and a falling film concentrating machine using same. The controllable water distributor includes a liquid storage tank and a liquid inlet pipe which are communicated with each other. One end of the liquid inlet pipe is extended into interior of the liquid storage tank. A plurality of liquid distributing branch pipes are arranged on the bottom of the liquid storage tank in a matrix arrangement manner and are inserted into heat exchange pipes of a heat exchanger in a one-to-one aligned manner, so that pressure of a Chinese herbal medicine solution in the liquid storage tank can be adjusted by controlling the inlet quantity of the liquid inlet pipe, thereby changing the spray quantity of the liquid distributing branch pipes and further controlling wetting quantity of the heat exchange pipes; namely, the initial thickness of a liquid film in the heat exchange pipe is controlled, so that when the liquid film flows from the top ends to the bottom ends of the heat exchange pipes, a very thin layer exists when the liquid film flows to the bottom ends although the thickness of the liquid film is reduced due to evaporation, thereby not only increasing evaporation ratio of the liquid film but also avoiding problems of dried walls and scaling.

Description

technical field [0001] The invention relates to the technical field of concentration and evaporation equipment, in particular to a controllable water distributor and a falling film concentrator using the same. Background technique [0002] Falling film concentration is to add the feed liquid from the upper tube box of the heating chamber of the falling film evaporator, and evenly distribute it to each heat exchange tube through the water distribution device. Under the action of gravity and air flow, it flows into a uniform film from top to bottom. Falling film concentration is often used for liquid concentration and evaporation of medicine and food because of its low energy consumption. [0003] However, the existing water distributor cannot control the initial thickness of the liquid film. If the liquid film is too thin, it will be completely evaporated, and the heat exchange tube will have dry wall phenomenon; if the liquid film is too thick, the concentration rate will be...

AI Technical Summary

Problems solved by technology

[0003] However, the existing water distributor cannot control the initial thickness of the liquid film. If the liquid film is too thin, it will be completely evaporated, and the heat exchange tube will have dry wall phenomenon; if the liquid film is too thick, the concentration rate will be low, and the number of concentration cycles will be increased; The concentrator is prone to fouling or dry wall, and the heating pipe is long, taking up a lot of space

However, Chinese herbal medicine extracts contain some macromolecular substances (such as polysaccharides, starch, colloid, etc.), particulate dirt and biological fouling mixtures, etc. The extract is mostly concentrated by forced circulation

Although forced circulation concentration is not easy to scale, it consumes a lot of energy, which leads to high processing costs of Chinese herbal medicine extracts

Images