基于热质传递解耦特性的溶液除湿过程传热传质系数(Ⅱ) 实验与Le-h_D分离测量法应用

Heat and mass transfer coefficients based on decoupling characteristics of heat and mass transfer between liquid desiccant and air(Ⅱ) Experiments and application of new method

对采用规整波纹填料结构的溶液除湿器除湿过程进行了实验研究,空气与溶液流型组织形式为叉流,基于Le-hD分离测量法得到空气入口流量、温度、含湿量以及溶液入口质量分数、温度对耦合传质系数的影响,并采用数据回归的方法对传质系数与Lewis数进行拟合,得到该类结构除湿器除湿过程的传质系数与Lewis数的关联式,并进行了74组稳态实验对该关联式进行误差分析与验证,结果表明根据关联式计算得到的进出口参数变化与实验进出口参数变化之间相对误差很小,进出口空气温度变化、含湿量变化误差分别仅在6%、10%以内,进出口溶液温度变化相对误差不超过12%,表明Le-hD分离测量法的准确性和可接受性。

Experiments for the liquid desiccant dehumidification process with a cross flow structured packed dehumidifier were performed. Based on the Le-hD separative evaluation method, mass transfer coefficients were obtained according to the experimental results. The effects of the temperature, flow rate and humidity ratio of inlet air, the temperature and mass concentration of inlet desiccant solution on mass transfer coefficients were analyzed. The correlations of mass transfer coefficients and Lewis number were established. Additional 74 groups of experiments validated the correlations. The calculated values were compared with the experimental values and it was found that the differences of air outlet humidity, temperature and solution outlet temperature between calculated and experimental results were respectively less than 10%, 60%, 12%. The results illustrated that the Le-hD separative evaluation method was quite acceptable and the correlations of mass transfer coefficients were accurate for packed tower designing or simulation of thermodynamic performance.