Sodium chloride evaporation crystallization device

Abstract

The invention discloses a sodium chloride 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 and a feeding groove, a gas phase tube of the third effect evaporation unit is connected to a surface condenser, a crystal slurry pipe of the third effect evaporation unit 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; a throttling gear is arranged on a connecting pipe of a separator and heating column tubes in the first effect evaporation unit, the second effect evaporation unit and the third effect evaporation unit; 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. The sodium chloride evaporation crystallization device has the advantages of high operation concentration and less reflux mother liquor.

Description

Technical field [0001] The invention relates to an evaporation separation equipment, in particular to a sodium chloride evaporation crystallization device. Background technique [0002] Evaporative crystallization devices are widely used in the chemical industry, non-ferrous metal industry, pesticide industry, food industry, pharmaceutical industry, and wastewater treatment in ammonia desulfurization, mining and smelting, steel mills, oil fields and other industries. Through the recovery of crystals in the wastewater, the pure Environmental protection governance and compliance discharge are deepened into environmental protection governance and comprehensive utilization. Not only can the ammonium chloride, potassium chloride, sodium chloride and other crystals in the waste water be recycled and reused, but the evaporated water can meet the national discharge standards. [0003] Due to the characteristics of sodium chloride materials, the solubility of sodium chloride is not affecte...

AI Technical Summary

Problems solved by technology

The method of cooling and crystallization does not contribute much to improving the crystallization rate. The main reason is that the heat exchange tubes of the evaporator are likely to cause fouling or clogging after the concentration increases, so the concentration cannot reach supersaturation. The operating concentration cannot be increased, and there will be a large amount of reflux mother liquor, which increases the consumption of heat energy

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