精制盐水热泵蒸发过程模拟

热泵蒸发制盐工艺的经济性与否，取决的主要因素是能耗，因此如何降低能耗成为改进工艺的主要方向。多效蒸发制盐可以通过改变流程、增加效数、增设预热、各效闪发等操作降低工艺的能耗，热泵蒸发制盐主要可以通过改变蒸发压力来降低能耗。用Aspen Plus模拟研究探索热泵制盐节能措施，模拟中采用质量分数为25%的纯盐溶液，选择常压、正压（132.5 kPa）蒸发，计算对比不同压力下的能耗大小，并同五效蒸发制盐能耗进行对比，继而选出最优工艺，实现经济效益最大化。

Simulation of thermo-compression evaporation in purified brine

Whether the heat pump evaporation salt making process is economical mainly depends on the energy consumption.So how to decrease the energy consumption becomes the key direction of technology improvement.The energy consumption of multi-effect evaporation salt making process can be decreased by changing the structure of the process，increasing the number of the effects，adding preheating equipments，flash evaporation in every effect and so on.The energy consumption of heat pump evaporation salt making process can be decreased by changing the evaporation pressure.By using process simulation software Aspen Plus，the modeling of multi-effect evaporation in vacuum salt process was built to study the measures of decrea-sing energy consumption.In the simulation，at atmospheric and positive pressure（132.5 kPa），25% pure salt solution was usedand the energy consumptions at different pressures were compared.Meanwhile it was also compared with the five effects evaporation process. Based on the simulation results，the best process can be chosen and the economic benefits can be maximized.