Mechanical steam recompression continuous evaporative crystallization system and mechanical steam recompression continuous evaporative crystallization method

Abstract

The invention relates to a mechanical steam recompression continuous evaporative crystallization system and a mechanical steam recompression continuous evaporative crystallization method. The system comprises an evaporation unit and a crystallization unit, wherein the evaporation unit and the crystallization unit are both provided with water steam compressors; material liquid enters the evaporation unit to be evaporated and subsequently is subjected to gas-liquid separation; the separated secondary steam enters a steam compressor to be compressed, and subsequently enters the crystallization unit to be used as heat source heating material liquid; the material liquid which is evaporated and compressed in an evaporator enters the crystallization unit to be crystallized; the secondary steam generated by crystallization enters the steam compressor to be compressed, subsequently enters the crystallization unit and is used as a heat source for heating the materials in the crystallization unit so as to crystallize the materials; and the crystallized materials are discharged. The system is compact in equipment, small in occupied area and small in desired space, and a cooling system can be omitted; and the secondary steam in the evaporation and crystallization process is sufficiently utilized, the latent heat is recycled, and the heat efficiency is improved.

Description

technical field

[0001] The invention relates to the technical field of evaporation crystallization, in particular to a mechanical vapor recompression continuous evaporation crystallization system and method. Background technique

[0002] Evaporative distillation is widely used in many industries involving evaporation processes, such as sewage / wastewater treatment, chemical industry, pharmaceuticals, food, seawater desalination, and salt production. Evaporative distillation is an energy-intensive process, and the evaporation process is the largest energy consumer in these industries. The main production and consumption of these industries lies in the cost of energy consumption.

[0003] At present, the existing domestic industries involved in the evaporation process generally adopt multi-effect evaporation technology for evaporation and concentration. The working process needs to maintain a large amount of raw steam, and it needs to be equipped with coal-fired boilers and co...

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