单效蒸发机械压汽海水淡化系统热力性能分析

Thermal performance analysis of single-effect evaporation mechanical vapor compression seawater desalination system

机械压汽蒸馏海水淡化是唯一消耗机械能的热蒸馏海水淡化方式。文中以单效蒸发机械压汽(SEE-MVC)系统为研究对象,建立了数学模型,分析了重要参数对热力性能的影响,结果表明:压缩机增压比越低、定熵效率越高、蒸发温度越低,则产水比功耗越低、系统回收率越高;综合考虑各种因素,系统蒸发温度在55—70℃、增压比在1.2—1.3为宜。文中还给出了典型条件下对应最小比功耗的系统参数,并讨论了参数特点,可供设计时参考。

As the only thermal desalination process is run by mechanical energy, the mechanical vapor compression distillation system has advantages of higher quality of production water, higher energy efficiency, and lower thermal pollution to the environment. A thermal performance analysis of a single-effect evaporation mechanical vapor compression （SEE-MVC） seawater desalination system was presented. The mathematic model was built, and a parametric analysis was performed. The results show that lower compression ratio, higher isentropic efficiency of compressor and lower evaporation temperature of seawater lead to lower power consumption and higher recovery rate of water production. The suitable range of evaporation temperature is 55-70℃, and that of compression ratio is 1.2-1.3. Taking the minimum specific work consumption as objective function, the main parameters of several cases were given for reference.