CaBr_(2)溶液除湿再生性能及腐蚀性实验研究

Experimental study on dehumidification and regeneration performance and corrosiveness of CaBr_(2) solution

为提升溶液除湿系统的再生性能、提高低品位能源的转化率,降低腐蚀性与初始成本,建立离子压降模型来选择压降能力强的CaBr_(2)溶液,基于静态法测量了该溶液的饱和蒸气压并确定了溶液配比;采用除湿量、再生量与空气进出口含湿量差值3个评判指标研究了不同工况下CaBr_(2)溶液的除湿/再生性能;将CaBr_(2)溶液与LiCl、LiBr溶液进行了腐蚀性、经济性对比.结果表明:3种溶液的除湿性能彼此接近,但CaBr_(2)溶液再生量比LiCl溶液平均提高了14.2%,比LiBr溶液平均提高了17.1%;CaBr_(2)溶液腐蚀速率小于LiCl溶液腐蚀速率,与LiBr溶液腐蚀速率相当;单位体积CaBr_(2)溶液成本最低,约为LiBr溶液成本的55%、LiCl溶液成本的50%.CaBr_(2)有望成为传统除湿溶液的替代品.

To improve the regeneration performance of liquid desiccant systems,increase the conversion of low-grade energy and reduce corrosion and initial costs,an ionic pressure drop model was developed to select a CaBr_(2) solution with the high pressure drop capacity and the saturated vapor pressure of the solution was measured based on the static method to determine the solution proportioning.Three evaluation criteria,including dehumidification/regeneration amount and the difference between air inlet and outlet moisture content were used to evaluate the dehumidification/regeneration performance of the CaBr_(2) solution under different working conditions.The corrosiveness and the economy of the CaBr_(2) solution were compared with LiCl and LiBr solutions.Experimental results indicate that the dehumidification performance of the three solutions are close to each other,but the regeneration amount of the CaBr_(2) solution is by an average of 14.2%higher than that of the LiCl solution,and by an average of 17.1%higher than that of the LiBr solution;the corrosion rate of the CaBr_(2) solution is only half of that of the LiCl solution,which is almost the same as that of the LiBr solution.The cost per unit volume of the CaBr_(2) solution is the lowest,about 55%of the cost of the LiBr solution and 50%of the cost of the LiCl solution.CaBr_(2) is expected to be an alternative to traditional dehumidification solutions.