基于风能利用的机械蒸汽压缩海水淡化系统模拟

通过对机械蒸汽压缩(mechanical vapor compression,MVC)-多效蒸馏(multi-effect evaporator,MEE)海水淡化系统建立模型,研究了压缩机输入功率与海水淡化系统运行参数之间的关系,分析了系统中压缩机与多效蒸发器之间相互耦合的匹配关系,探讨了辅助能源加热对系统运行状态及产水率的影响,并通过耦合风力发电机模型,研究了系统淡水产率随风电功率随机变化的响应曲线。结果表明:随压缩机输入功率的增加,多效蒸发器效间的传热温差增大,产水率也近似线性增加;辅助能源虽然有助于提高产水率,但其添加量不能超过一定的上限;对于一组平均为7.1m/s的随机风速,海水淡化系统的平均产水率为5.00t/h,平均产水能耗10.2kWh/t,而若采用20%辅助能源加热,可以使平均产水率提高0.21t/h。

System Simulation of Mechanical Vapor Compression Seawater Desalination Plant using Wind Power

The system simulation of a mechanical vapor compression (MVC) seawater desalination plant using multi-effect evaporator (MEE) is present in this paper. The relationship between the power input of the compressor and the running parameters of the system is studied and the coupling relation between the compressor and MEE with the input power change is analyzed. The effect of the auxiliary energy compensation added before the MEE on system running parameters is discussed and the fresh water produce rate with the random changed wind power is finally examined by coupling with a wind-power generator model. The results show that the evaporation temperature difference between effects, as well as the fresh water produce rate increase as the compressor power. The addition of the auxiliary energy shows pro-effect on fresh water produce rate, however, the amount of the auxiliary energy has an upper limitation. For the random wind power input case with the average wind velocity of 7.1m/s, the average fresh water produce rate is about 5t/h and the average energy consumption is about 10.2 kWh per ton of fresh water. If using the auxiliary energy of 20% of the input wind power, the average fresh water produce rate will increase by 0.21t/h.