Automatic-cleaning type evaporative crystallization device

Abstract

The invention discloses an automatic-cleaning type evaporative crystallization device. A falling film evaporator is arranged at the upper part, the center of the falling film evaporator is provided with a demister, a crystal bottom tank is arranged at the lower part, and a circulation system of the evaporative crystallization device and metering and pipe valve systems for entering and existing offeed liquid are arranged at the outside. The automatic-cleaning type evaporative crystallization device is structurally characterized in that the falling film evaporator, the crystal bottom tank, andthe demister are of three-in-one. An automatic cleaning mechanism of a heating tube of the falling film evaporator consists of a soft spring, a reciprocating motion film distributor capable of movingup and down, and a cleaning spiral; the soft spring is mounted on a fixing plate of a top chamber, and is connected with the cleaning spiral through the reciprocating motion film distributor; the softspring is used for high-power amplification of undulating flow in the heating tube of the falling film evaporator to realize spiral reciprocating automatic cleaning of crystallized salt fouling on the inner wall of the tube. The evaporator of the device is automatically cleaned, the crystal bottom tank is anti-blocking, the advantages of high efficiency, large energy saving, reliability and compact structure are realized, and the device is especially suitable for technical upgrading of small falling film evaporators and current natural circulation evaporators.

Description

technical field [0001] The invention relates to an automatic cleaning evaporation and crystallization device, relates to the descaling and cleaning and heat transfer enhancement of crystallized salt scale in the tube of a tubular falling film evaporator, and also relates to the anti-blocking of the crystallization bottom tank. It is mainly suitable for the technical transformation of small falling film evaporation crystallization bottom tanks for periodic parking and cleaning and active natural circulation evaporation crystallization bottom tanks. It can not only greatly increase production capacity, but also have relatively large energy-saving benefits. Background technique [0002] There are many kinds of existing evaporator automatic cleaning technologies. [0003] The fluidized cleaning technology introduced in the document "New Anti-scaling Technology for Evaporation Devices and Its Application in Calcium Chloride Production" (No. 8, Inorganic Salt Industry, 2008) is a ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the structure is complex, the circulation flow is large, the liquid film is thick, the frequency is very low, the descaling intensity is not high enough, it cannot meet the descaling requirements of the crystallization evaporator, and the efficiency is not high enough

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