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Evaporation and crystallization system with heat and mass transfer and its working method

An evaporative crystallization and thermal mass technology, applied in the direction of evaporative separation crystallization, evaporation, separation methods, etc., can solve the problems of high energy consumption, high heating temperature, large consumption of precious metals, etc., to achieve low energy consumption, low energy consumption, Low consumption of precious metals

Active Publication Date: 2018-12-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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

Method used

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  • Evaporation and crystallization system with heat and mass transfer and its working method

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Embodiment Construction

[0013] figure 1 It is the heat and mass co-transfer evaporation crystallization system proposed by the present invention, refer to below figure 1 Describe the working process of the system.

[0014] The air flows in from the lower air inlet of the heat and mass transfer tank 5 through the blower 8, and after heat and mass transfer occurs with the low-concentration solution sprayed from top to bottom, it passes through the induced draft fan 7 from the upper air outlet of the heat and mass transfer tank 5 into the environment;

[0015] The initial solution flows into the system from the material inlet 21, and mixes with the clear mother liquor at the outlet of the mother liquor circulating pump 1 and the mother liquor at the outlet of the mother liquor pump 17 to form a low-concentration solution. The low-concentration solution flows into the cold side of the heater 2 and absorbs its low boiling point on the hot side After the heat released by the working fluid, it flows in fr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/14B01D9/02
CPCB01D1/14B01D9/0031
Inventor 韩东何纬峰岳晨黄岭蒲文灏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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