耦合太阳能集热的MVR蒸发结晶系统性能分析

Performance Analysis of a Solar-Assisted MVR Evaporative Crystalization System

针对高浓度含盐废水蒸发结晶过程中机械式蒸汽再压缩(mechanical vapor recompression,MVR)系统能效显著降低等问题,提出耦合太阳能集热的MVR蒸发结晶系统,并基于数值模型对系统关键运行参数进行了仿真分析。结果表明:针对质量浓度为2%的NaCl废水,耦合太阳能集热的MVR蒸发结晶系统压缩机耗功显著降低,系统性能系数(coefficient of performance,COP)达到24.96;随蒸发器浓缩倍率由4升高至12,压缩机耗功增加71.5%,集热面积减少72.9%;低压闪蒸有利于降低系统温度并提高物料处理量,但压缩机耗功随之增大。

To improve the thermal efficiency of the mechanical vapor recompression(MVR)system in high-salinity wastewater evaporative crystallization process,a novel solar-assisted MVR system was proposed.Based on the numerical model,some key operation parameters were analyzed.Results showed that the proposed system required lower compression work,and as the NaCl mass concentration was lower than 2%,the coefficient of performance(COP)reached 24.96.As the concentration ratio of the evaporator increased from 4 to 12,the compression work increased by 71.5%and the collector area decreased by 72.9%.Lower flashing pressure was beneficial to reduce the system temperature and increase processing capacity,while the compression work increased.