热泵蒸发分离电镀废水处理系统喷雾塔分离性能试验研究

Experimental Investigation on Separation Performance of Spray Column in the Treatment System for Separation of Electroplating Effluents by Evaporation Coupled with Heat Pump

基于增湿―去湿技术与热泵耦合的蒸发分离电镀废水处理系统可以实现电镀废水零排放处理,其中蒸发分离器作为传热传质核心部件决定了系统性能。搭建了喷雾塔式蒸发分离器试验台,研究了不同溶液浓度下入口溶液温度、入口空气温度、空气流量对喷雾塔分离性能的影响。增加入口溶液温度和入口空气温度可以有效强化分离过程,而只有当原本空气流量不大时增加空气流量,分离过程可以得到明显强化。溶液浓度的增加使得蒸发量和蒸发效率降低,当空气温度不高时可以降低蒸发能耗。

The treatment system for separation of electroplating effluents by evaporation based on coupled with heat pump based on humidification—dehumidification（HDH）technology and coupled with heat pump can achieve zero emission in the treatment of electroplating effluents,in which,the spray column,as the core component for heat and mass transfer,determines the integrated performance of the system. The spray column type evaporative separator test bench was erected to research the influence of entering solution temperature,entering air temperature and air flow rate at different solution mass concentrations on the separation performance of the spray column. Increasing the entering solution temperature and the entering air temperature can effectively enhance the separation process,but only when the air flow rate is originally not big,the separation process can be enhanced significantly by increasing the air flow rate. Increase of solution concentration makes the evaporation capacity and evaporation efficiency reduced,which can reduce evaporative energy consumption when the air temperature is not high.