减压膜蒸馏过程与热泵耦合技术研究

Research of couple technology of vacuum membrane distillation process with heat pump

采用压缩式热泵回收减压膜蒸馏(VMD)过程的相变热,用于加热减压膜蒸馏系统原料液,并研究VMD过程与热泵耦合技术,以获得二者耦合工作的最佳工艺条件.结果表明:在组件进膜温度为70℃、膜组件面积为0.1 m2、膜蒸馏系统的进料流量为2.0 L/min、原料液加热循环流量为2.3 L/min、蒸汽冷凝循环流量为1.6 L/min、真空度为0.09 MPa条件下,热泵COP为3.08,膜通量为17.8 kg/(m2.h),产水电导率小于10μS/cm.这说明热泵较好地回收减压膜蒸馏过程中的蒸汽潜热,达到了能量循环使用的目的.

Vapor compression heat pump is used to recover the phase change heat from vacuum membrane distillation（VMD） process and re-heat raw material of VMD,and the couple technology of vacuum membrane distillation（VMD） process with heat pump is studied to obtain the optimal operation parameters coupled.The experimental results show that the heat pump COP reaches 3.08,the membrane flux arrives at 17.8 kg/（m2·h）,and the conductivity of water yielded is less than 10 μS/cm,when the temperature of fluid flow into the component is 70 ℃,the membrane area is 0.1 m2,the liquid flow of membrane distillation system is 2.0 L/min,the liquid flow of the heating circulation system is 2.3 L/min,the liquid flow of vapor condensation circulation system is 1.6 L/min,and the vacuum conditions is 0.09 MPa.