Design and performance analysis of mechanical vapor recompression salt fractionation evaporation crystallization system

被引：0
|
作者：
Jiang H. [1 ]
Zhang Z. [1 ]
Gong W. [2 ]
Chang Y. [1 ]
机构：
[1] School of Energy, Xi’an University of Science and Technology, Shaanxi, Xi’an
[2] School of Energy and Power Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 07期
关键词：
crystallization; energy consumption analysis; exergy analysis; mathematical modeling; mechanical vapor recompression(MVR); salt fractionation; waste water;
D O I：
10.16085/j.issn.1000-6613.2021-1619
中图分类号：
学科分类号：
摘要：
Multi-component high salinity wastewater treatment by salt fractionation crystallization technology can realize resource utilization of wastewater. The solubility of sodium sulfate and sodium chloride varies with temperature. To solve the above issue, mechanical vapor recompression(MVR) salt fractionation evaporation crystallization system was proposed. The proposed system was based on a falling film evaporator as a pre-evaporator, combined with two forced circulation evaporators, which can separate sodium sulfate and sodium chloride from wastewater by crystallization and recover condensate. After designing the specific process flow, mathematical model of the proposed system was established according to balance relationship of mass and energy and validated by experimental data. Taking mixed solution with sodium sulfate concentration of 5% and sodium chloride concentration of 8% at atmospheric pressure as an example, the model was calculated by Matlab software. A five-effect evaporation salt separation system was introduced as a contradistinction system. Based on energy and exergy analysis, the results showed that MVR salt fractionation evaporation crystallization system was much more energy-efficient. Its coefficient of performance (COP) was 93.5%, higher than that of the contradistinction system. Its unit energy consumption was 77.6%, lower than that of the contradistinction system. Meanwhile, MVR salt fractionation evaporation crystallization system had higher thermodynamic perfectibility. Its exergy efficiency was 70.4%, higher than that of the contradistinction system, and exergy loss was 33.6%, lower than that of the contradistinction system. © 2022 Chemical Industry Press. All rights reserved.
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页码：3947 / 3956
页数：9
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