Heat-mass co-transfer evaporation and crystallization system and working method thereof

Abstract

The invention discloses a heat-mass co-transfer evaporation and crystallization system and a working method thereof, and belongs to the field of solution evaporation and crystallization. The heat-mass co-transfer evaporation and crystallization system mainly comprises an air blower, a draught fan, a heat-mass transfer tank, a heater, a crystallization tank, a maturing tank, a compressor, an expansion valve, and the like. The heat-mass co-transfer evaporation and crystallization system is characterized in that air and a solution are in direct contact to transfer heat and mass in the heat-mass transfer tank, and thus the solution is evaporated and crystallized; due to additional arrangement of the maturing tank in the system, the solution can be further crystallized; a low-melting point working medium is evaporated after absorbing heat in the maturing tank, is subjected to compression heating by using the compressor, and is further added into the heater to heat the solution to be evaporated, so that internal energy transfer of the system is achieved. The heat-mass co-transfer evaporation and crystallization system adopts a heat-mass co-transfer method, evaporation and crystallization of the solution can be achieved at normal temperature, the heating temperature is low, the noble metal consumption amount is small, and a remarkable energy conservation effect can be achieved. The system is applicable to evaporation and crystallization processes of solutions of which the solubility is improved along with increase of temperature.

Description

technical field [0001] The invention designs a heat and mass co-transfer evaporation crystallization system and its working method, belonging to the field of solution evaporation crystallization. Background technique [0002] Evaporative crystallization is the process of evaporating and concentrating a solution to reach supersaturation, thereby precipitating crystals. At present, the commonly used evaporative crystallization technology in industry mainly includes multi-effect evaporative crystallization and mechanical vapor recompression (Mechanical VaporRecompression, MVR) evaporative crystallization technology. These two technologies belong to the boiling evaporation technology, which needs to heat the material solution to a boiling state. Due to the large amount of vaporized solvent during evaporation, the evaporation process requires a large amount of heating steam and consumes a lot of energy. In addition, the boiling evaporation technology uses a partition heat transf...

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Problems solved by technology

[0004] Aiming at the disadvantages of high heating temperature, high energy consumption and large consumption of precious metals in the existing boiling evaporation technology, the present invention proposes a heat and mass simultaneous evaporation and crystallization system with low heating temperature, low energy consumption and low consumption of precious metals

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