Sodium sulfate evaporation crystallization device

Abstract

The invention discloses a sodium sulfate evaporation crystallization device which comprises a first effect evaporation unit, a second effect evaporation unit and a third effect evaporation unit which are connected in sequence, the first effect evaporation unit is connected with a steam input pipe, the third effect evaporation unit is connected with a feeding groove, a gas phase tube of the third effect evaporation unit is connected to a surface condenser, a vacuum pump is arranged on the surface condenser, and the surface condenser and a cooling tower form a cooling loop; evaporation condensate tubes of the second effect evaporation unit, the third effect evaporation unit and the surface condenser are connected to a condensate collection groove, a crystal slurry pipe of the second effect evaporation unit is connected to a cooler crystallizer, a spiral conveyer is arranged at the position of the inlet of the crystal slurry pipe, the output end of the cooling crystallizer is connected to a centrifuge, the centrifuge is provided with a solid salt output end and a mother liquor tube, and the mother liquor tube is connected to a mother liquor tank. The sodium sulfate evaporation crystallization device has the advantages of high crystallization efficiency and low heat energy consumption.

Description

technical field [0001] The invention relates to an evaporation separation device, in particular to a sodium sulfate evaporation crystallization device. Background technique [0002] Evaporation and crystallization devices are widely used in chemical industry, non-ferrous metal industry, pesticide industry, food industry, pharmaceutical industry, ammonia desulfurization, mining smelting, steel mills, oil fields and other industries for waste water treatment. Through the recovery of crystals in waste water, pure environmental protection Treatment and up-to-standard discharge are deepened into environmental protection treatment and comprehensive utilization. The ammonium chloride, potassium chloride, sodium sulfate and other crystals in the waste water are recovered and utilized. [0003] Due to the characteristics of sodium sulfate materials, mainly the solubility of sodium sulfate is greatly affected by the change of temperature. After the material is evaporated and discharg...

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Problems solved by technology

[0003] Due to the characteristics of sodium sulfate materials, mainly the solubility of sodium sulfate is greatly affected by the change of temperature. After evaporating and discharging from the evaporator, the concentration reaches a saturated state or is close to a saturated state. The traditional technology is to enter the cooling crystallization device for cooling and crystallization, that is to say By cooling crystallization, because the sodium sulfate saturated solution entering the cooling crystallization device or the solution concentration close to the saturated state is low, although the amount of crystals precipitated is less after cooling, the amount of sodium sulfate solids collected after centrifugation is less. After cooling the crystallization device, the temperature of the centrifuged mother liquor drops greatly, and a large amount of low-temperature centrifuged mother liquor must be returned to the evaporation system to consume heat energy again, resulting in a large waste of heat energy

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