不同工况下除湿溶液再生的模拟与实验

建立了LiCl溶液再生过程的数学模型,通过模拟分析,得到了溶液再生量、溶液温度和溶液浓度随时间的变化规律。以平均再生量为评价指标,对LiCl溶液的再生性能进行了实验研究。分析了热源温度、溶液浓度、溶液初始温度、再生压力和冷水温度5个因素分别对溶液再生性能的影响规律。实验结果表明:溶液浓度和再生压力对溶液再生性能影响显著,冷水温度对溶液再生性能的影响最小。在设定的标准工况下,再生压力为4kPa、溶液中LiCl质量分数从28%增大到34%时,平均再生量由20.45g/(m²·s)减小至7.44g/(m²·s);再生压力从4kPa升高至10kPa时,平均再生量由15.33g/(m²·s)降低至1.92g/(m²·s)。最后,以溶液温度和溶液浓度作为对比目标参数将模拟结果和实验结果进行了对比分析,结果表明,实验值与模拟值符合较好。

Simulation and experimental study on regeneration of desiccant solution on different conditions

The mathematical model of regeneration process of lithium chloride water solution was built in this paper. Variation of average moisture removal rate, temperature and concentration of solution with time were obtained by simulation analysis. Experimental study of regeneration performance of lithium chloride water solution was carried out using average moisture removal rate as the evaluation index. Influence trends of temperature of hot water , concentration of solution, initial temperature of solution, regeneration pressure, and temperature of cold water these five factors on regeneration performance were analysed, respectively. Experimental results showed that concentration of solution, pressure of regeneration have significant impact on regeneration performance, temperature of cold water has a weak influence on regeneration performance. At standard operating conditions, the pressure of regeneration is 4 kPa. When the mass fraction of LiCl in solution increased from 28% to 34%, the average moisture removal rate decreased from 20.45g/ (m²·s) to 7.44g/ (m²·s). When pressure of regeneration increased from 4kPa to 10kPa, the average moisture removal rate decreased from 15.33g/ (m²·s) to 1.92g/ (m²·s). At last, both simulation and experimental results using temperature and concentration of solution as target parameters were compared and analysed. Results showed that simulation and experimental values are in a good agreement.