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中文摘要：
针对减压膜蒸馏（VMD）过程能耗高的问题,设计了1种耦合热泵技术的减压多效膜蒸馏（HP-VMEMD）工艺。其特征是采用新型多效膜蒸馏组件（MH型）逐级回收VMD过程所产蒸汽的潜热,促进原料液的二次蒸发;且使用热泵技术,为残余蒸汽的冷凝提供低温冷却水,并提高残余蒸汽潜热品位以预热原料液。实验研究了原料液循环流量、膜组件面积、冷却水循环流量和过程级数对HP-VMEMD过程膜通量J和造水比GOR的影响。结果表明,当膜面积为1.61 m^2,原料液温度为70℃,原料液循环体积流量为104 L/h,冷却水循环体积流量为56 L/h,热泵COP为3.11时,J为2.26 kg/（m^2·h）,GOR为3.65。
英文摘要：
Aiming to solve the problem of high energy consumption in vacuum membrane distillation （VMD） process, a technology of vacuum multi-effect membrane distillation coupled with heat pump （HP-VMEMD） has been designed. Its characteristic was that a new type of multi-effect membrane distillation module （MH type） was applied to recycle the latent heat of evaporation in VMD process in a stepwise manner, promoting the secondary evaporation of feed liquid. Low temperature cooling water was provided for condensing residual steam by the heat pump, and the grade of residual steam＇s latent heat to preheat the feed liquid was also increased. The effects of feed liquid circulation flow, membrane area, cooling water circulation flow and process stages on the membrane flux （J） and gained output ratio （GOR） in HP-VMEMD process have been experimentally studied. When the membrane area was 1.61 m2, the feed liquid temperature was 70 ℃, the feed liquid circulation volume flow rate was 104 L/h, the cooling water circulation volume flow rate was 56 L/h, and heat pump COP was 3.11, the flux of system J could be 2.26 kg/（m^2·h） and the GOR could be 3.65.
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