双效压缩式热泵海水淡化系统性能研究

Simulation Analysis of Double-effect Cmpression Heat Pump Seawater Desalination System

将压缩式热泵与多效蒸发水处理技术相结合,提出一种双效热泵海水淡化系统。利用Aspen仿真软件建立了系统仿真模型,研究热泵蒸发温度、冷凝温度,双效系统效间传热温差和浓海水循环比对双效蒸发系统的性能参数PR和淡水产出量的影响。结果表明:随着热泵蒸发温度的提高,PR值增加但淡水产量减少;PR值和淡水产量都随着热泵冷凝温度的升高而下降;热泵运行条件一定时,为了获得最高的PR和淡水产量,两效之间存在着最佳的温度差。进料海水为80 kg/h、一效蒸发温度为40℃的条件下,蒸发/冷凝温度为20℃/50℃时,系统的PR达到40.07;在蒸发/冷凝温度为10℃/50℃时,淡水产量为39.76 kg/h。

A double-effect compression heat pump seawater desalination system was proposed by combining a compression heat pump and a multieffect distillation system. The system simulation model was established by using Aspen simulation software. The effects of the evaporation and condensation temperatures of the heat pump working medium, the heat transfer temperature difference between the effect systems, and the brine circulation ratio on the PR and fresh water production of the double-effect evaporation system were studied. The results showed that under the conditions of feed seawater is 80 kg/h, the first effect evaporation temperature is 40 ℃, when the condensation temperature is 50 ℃ and the evaporation temperature is 20 ℃, the performance of the double-effect evaporation system was better, PR=40.07. When the condensation temperature is 50 ℃ and the evaporation temperature is 10 ℃, the fresh water production of the double-effect evaporation system is 39.76 kg/h.