A light salt water pretreatment device

Abstract

The invention relates to a light salt brine pretreatment device. The innovation point is that the light salt brine pretreatment device comprises a salt brine heat exchanger, a circulating pipeline, a sodium sulfite dropwise-adding device and a diluted hydrochloric acid dropwise-adding device, wherein a refrigerant inlet of the salt brine heat exchanger is communicated with light salt brine supply equipment by a pipeline K; a refrigerant outlet of the salt brine heat exchanger is communicated with a light salt brine storage tank by a pipeline L; the two ends of the circulating pipeline are communicated with the bottom of the light salt brine storage tank and the pipeline K respectively; and the sodium sulfite dropwise-adding device and the diluted hydrochloric acid dropwise-adding device are arranged on the pipeline K and the pipeline L. The light salt brine pretreatment device has the advantages that: the initial temperature of the light salt brine entering heat concentration equipment is increased by utilizing the salt brine heat exchanger, and the heat consumption is reduced; the sodium sulfite dropwise-adding device, the diluted hydrochloric acid dropwise-adding device and the salt brine heat exchanger are matched for dissolving chlorate in the light salt brine and regulating the pH value of the light salt brine, so that the light salt brine is controlled to be alkalescent, and the service life of the heat concentration equipment in a next process is prolonged.

Description

technical field [0001] The invention relates to a heat exchange device, in particular to a light brine pretreatment device. Background technique [0002] The chlor-alkali industry mainly adopts two production processes of diaphragm method and ionic membrane electrolysis method to produce related products. In the production process of ionic membrane electrolysis method, the salt content of the electrolyte will drop from 300~310g / L to 200g / L after electrolysis. About L, it is necessary to increase the salt content of the electrolyte to the initial level in order to continue to produce products by electrolysis. [0003] At present, two methods are mainly used to increase the salt content. The first one is to use pure solid salt. The disadvantage is that when producing caustic soda, each ton of alkali needs to consume 1.5 tons of solid salt, which has a high cost and does not have market competition. The second method is the combination of electrolyte solution with low salt con...

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Problems solved by technology

[0004] However, the electrolyte or brine generally contains free chlorine, which is highly corrosive to the concentration equipment. Therefore, it is imperative to develop a light brine pretreatment device that can reduce the corrosion of the electrolyte and prolong the service life of the concentration equipment.

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