Processing process for evaporating and concentrating sodium sulfate aqueous solution to crystallize

Abstract

The invention discloses a processing process for evaporating and concentrating sodium sulfate aqueous solution to crystallize in the technical field of chemical equipment. The processing process has the following specific steps that: (S1) the sodium sulfate aqueous solution to be treated is evaporated and concentrated; (S2) materials are sent into a forced circulation evaporator, and are then sentinto a centrifugal machine for separation, and qualified mother liquid returns the forced-circulation evaporator again for secondary evaporation; (S3) secondary steam enters a compressor unit after passing through a gas-liquid separator; (S4) the secondary steam then enters an MVR (Mechanical Vapor Recompression) compressor; (S5) when the temperature of secondary-steam condensation water is reduced to be about 40 DEG C, the secondary-steam condensation water is discharged out of the system; (S6) heat-exchange evaporation is carried out and the whole system reaches heat balance. The processingprocess disclosed by the invention has the beneficial effects that steam to be abandoned originally is fully utilized, so that latent heat is recovered, the heat efficiency is improved, and the production cost is reduced; the phenomenon of pipe blocking is not easy to occur and full reuse of the secondary-steam condensation water can be achieved.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a processing technology for crystallization of evaporatively concentrated sodium sulfate aqueous solution. Background technique [0002] The existing processing technology of sodium sulfate crystallization adopts natural circulation, and the flow rate of the material in the heat exchange tube is low. At this flow rate, tube plugging is easy to occur. At the same time, during the evaporation process, the solution is easily entrained by gas and liquid, which affects the vapor compression. smooth operation of the machine. For this reason, we have proposed a kind of processing technology of evaporative concentrated sodium sulfate aqueous solution crystallization and put into use, to solve the above-mentioned problems. Contents of the invention [0003] The object of the present invention is to provide a kind of processing technique of evaporative concentration sodium su...

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Problems solved by technology

[0002] The existing processing technology of sodium sulfate crystallization adopts natural circulation, and the flow rate of the material in the heat exchange tube is low. At this flow rate, tube plugging is easy to occur. At the same time, during the evaporation process, the solution is easily entrained by gas and liquid, which affects the vapor compression. smooth operation of the machine

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