MVR (Mechanical Vapor Recompression) continuous evaporative crystallization system and continuous evaporative crystallization method

Abstract

The invention relates to an MVR (Mechanical Vapor Recompression) continuous evaporative crystallization system and a continuous evaporative crystallization method. The system comprises an evaporator, a steam-liquid separator, a main steam compressor, an assistant steam compressor and a crystallizer. The outlet of the evaporator is connected with the inlet of the steam-liquid separator. The top outlet of the steam-liquid separator is connected with the main steam compressor which is further communicated with the top inlet of the evaporator. The communicating pipeline of the main steam compressor with the top inlet of the evaporator is provided with a branched pipeline connected to the crystallizer. The branched pipeline is provided with the assistant steam compressor which is provided by a bypass. The bottom outlet of the steam-liquid separator is respectively connected with the inlets of the evaporator and the crystallizer. The top of the crystallizer is connected with the inlet of the steam-liquid separator. The method is carried out by the system. Through reasonable design, the energy-saving economical benefit, the integrity, the reasonability and the agility of the evaporative crystallization technology are further improved. Secondary steam in the evaporating and crystallizing process is adequately utilized, and latent heat is recovered, so that the thermal efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of evaporation crystallization, in particular to an MVR continuous evaporation crystallization system and a continuous evaporation crystallization 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...

AI Technical Summary

Problems solved by technology

This leads to the poor crystallization effect of the existing mechanical vapor recompression continuous evaporation crystallization system, such as problems such as small crystal particle size

There are also some manufacturers who will add steam pipes to supplement the heat supply of the crystallization part, but this greatly increases the complexity of the MVR system and relies on steam boilers, making the MVR system lose its original significant advantage - get rid of the dependence on steam boilers

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