Closed circulating membrane concentration system

Abstract

The invention discloses a closed circulating membrane concentration system which comprises a membrane unit, a circulating pump, an electromagnetic three-way valve, an on-line sulfate radical concentration tester, a booster pump and a high-pressure pump. One end of the membrane unit is connected with a liquid inlet pipe, and the other end of the membrane unit is connected with a clear liquid drain pipe and a concentrated liquid pipeline; the liquid inlet pipe is sequentially provided with the booster pump and the high-pressure pump; the on-line sulfate radical concentration tester, the electromagnetic three-way valve and the circulating pump are sequentially arranged on the concentrated liquid pipeline, and the membrane unit, the on-line sulfate radical concentration tester, the electromagnetic three-way valve and the circulating pump form closed circulating. The closed circulating membrane concentration system is mainly used for separating sulfate radicals from high-concentration monovalent ion salt, the membrane feed pressure is regulated by testing the concentration of sulfate radical ions in the concentration process of saline water, concentrated liquid drained by the system is supersaturated liquid, therefore, the draining volume is greatly decreased, energy consumption is at least reduced by 20% compared with an existing concentration system, and the number of applied membranes is also decreased by 20%.

Description

technical field [0001] The invention relates to a membrane concentration system, in particular to a closed-circuit circulation membrane concentration system, which is used in the field of equipment for removing sulfate radicals or carbonate radicals from high-concentration brine, especially for desulfurization radicals of light brine in an electrolytic cell. Background technique [0002] The existing membrane concentration system concentrates the sulfate radical in the high-concentration sodium chloride system far below the crystallization saturation of sodium sulfate, and the discharge of the concentrated solution of the membrane is relatively large, and the energy consumption is relatively high. [0003] In addition, the conventional membrane concentration system continuously enters and exits during operation, and the flow rate and operating pressure are relatively stable, resulting in serious concentration polarization on the membrane surface during operation, and the memb...

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Problems solved by technology

[0002] The existing membrane concentration system concentrates the sulfate radicals in the high-concentration sodium chloride system far below the crystallization saturation of sodium sulfate, and the discharge of the concentrated solution of the membrane is relatively large, and the energy consumption is relatively high

[0003] In addition, the conventional membrane concentration system continuously enters and exits during operation, and the flow rate and operating pressure are relatively stable, resulting in serious concentration polarization on the membrane surface during operation, and the membrane is also easily polluted, which makes the performance of the membrane decline

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