Thermal concentration system for dilute brine based on hydrogen chloride synthesis

Abstract

The invention relates to a thermal concentration system for dilute brine based on hydrogen chloride synthesis. The thermal concentration system is characterized by comprising a dilute brine concentrating furnace based on hydrogen chloride synthesis, and a flash tank for concentrating dilute brine, wherein a hydrogen chloride synthesis section of the dilute brine concentrating furnace based on hydrogen chloride synthesis is provided with a cyclic-heating clamping sleeve for dilute brine; a pipeline A and a pipeline B of the cyclic-heating clamping sleeve for dilute brine are communicated with the flash tank, so that a thermal concentration circulating channel for dilute brine is formed. Through the adoption of the thermal concentration system for dilute brine based on hydrogen chloride synthesis, which is disclosed by the invention, condensed acid can be directly prepared through cooling, and saturated by-product steam can be generated through the cooperation of a jacket structure and the flash tank; besides, the dilute brine is concentrated, so that four functions of synthesizing the hydrogen chloride, preparing the acid, generating the by-product steam, and concentrating the dilute brine are integrated in the thermal concentration system; the equipment investment is greatly simplified; the resources are reasonably integrated; the cost is reduced.

Description

technical field [0001] The invention relates to a light brine heat concentration system, in particular to a light brine heat concentration system based on hydrogen chloride synthesis. 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 310g / L to about 200g / L after electrolysis , 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 of the electrolyte. The first is to use pure solid salt to dissolve and increase the concentration. The disadvantage is that when producing caustic soda, each ton of alkali needs to consume 1.5 times the solid salt, and the cost is relativel...

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Problems solved by technology

[0003] At present, two methods are mainly used to increase the salt content of the electrolyte. The first is to use pure solid salt to dissolve and increase the concentration. The disadvantage is that when producing caustic soda, 1.5 times the solid salt needs to be consumed per ton of alkali, and the cost is relatively high. , does not have market competitiveness; the second is to use the combination of brine and solid salt, that is, to purchase brine with the same salt content and the price lower than solid salt to replace part of the solid salt, and then add solid salt to the brine To meet the salt content standard of the electrolyte, this method has been generally adopted by most manufacturers in the industry; the third method is to use concentrated brine to add a small amount of solid salt, and use heat pump technology to concentrate brine. Compared with the second method, It can further reduce the amount of solid salt added and reduce costs. However, the initial investment of heat pump technology is very large, and there is also a certain cost during use. The cost of concentrated brine is about 30 yuan / ton

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