两级多效太阳能增湿除湿苦咸水淡化装置的性能研究

Performance of a Two-Stage Multi-Effect Solar Desalination System Based on Humidification-Dehumidification Process

基于增湿除湿(HDD)的原理,设计了一种两级多效太阳能苦咸水淡化装置,用电加热水箱模拟太阳能集热器,对该装置进行了性能研究,目的是了解装置产水性能及效率.试验中,给出了装置在不同加热温度、苦咸水进水流量以及补水流量下的各测点温度变化和淡水产量,并理论分析了苦咸水进水流量对装置产水量的影响,与试验结果进行了对比,得到了不同进水流量下的装置性能系数(GOR).研究结果表明,系统产水量随苦咸水进水流量和加热温度增加而增大,在苦咸水进水流量为1 000kg/h时,装置产水量可以达到63.55kg/h.由于该装置多次利用了湿空气的凝结潜热以及排浓盐水所含的显热,其性能系数在加热温度为85℃时,最大可以达到1.98.且装置性能系数的理论计算值和试验测试值吻合较好.

A novel two-stage multi-effect solar desalination was presented based on humidification- dehumidification （HDD） process. Experimental study on the performance of device was carried out with an electric heater to simulate solar collector. The main objective of this work was to investigate the thermal efficiency and the water productivity of the unit. In the experiment, the effects of operating parameters on the performance of the desalination unit were studied, including heating temperature, brackish water flow rate and the supplement mass of brackish water. The temperature variation and the yield under different operating temperature were obtained. The effect of the brackish water flow rate on the yield of the unit was analyzed theoretically and compared with the experimental research results. So the gained output ratio （GOR） of the device can be obtained for different operating conditions. The research results show that the yield of the device increases with the increase of the water flow rate and the heating temperature; the yield of the unit can reach 63.55 kg/h at the water flow rate of 1 000 kg/h. TheGOR of the multi-effect solar desalination system can reach about 1.98, as the heating temperature is 85 ℃, because it recycles and reutilizes latent heat in the humid air and the residual heat in the brine. The trend of the GOR calculated theoretically is the same as that obtained in desalination operation. experimental system could results. This multi-effect solar humidification-dehumidification be potentially improved through optimization of its design and operation.