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摘要
This paper presents an analysis of a double-effect mechanical vapor recompression (DEMVR) wastewater treatment system. Thermodynamic and economic characteristics are investigated using high salinity wastewater containing (NH4)(2)SO4. Additionally, the effects of several important factors on the system are explored. The results indicate that compared with a single-effect mechanical vapor recompression system, the DEMVR system has an obvious advantage of improving thermodynamic performance. The DEMVR system saves 7.1% more energy compared with the single system. The energy saving rate of the system increases at a higher operating temperature and decreases with an increase in the temperature difference. The specific energy consumption is decreased slightly with an increase in operating temperature and decreased considerably with the reduction of temperature differences. Additionally, the specific heat transfer area tends to decrease with the rise of operating temperature and temperature difference. The minimum total power consumption and maximum coefficient of performance can be achieved at the intermediate concentration of approximately 32%. The results further reveal that the temperature difference has a considerable influence on the thermodynamic performance than does the operating temperature. The economic analysis shows that the specific evaporation cost of the system is low. Compared with the single system, the specific evaporation cost of the system could be lowered by 6.8%, to only 21 $ ton(-1).
- 出版日期2017-3
- 单位中国矿业大学（北京）
