热源塔热泵甲酸钠防霜溶液冷冻再生方法研究
Study on regeneration method of sodium formate anti-frost solution regenerator units using freezing concentration for heat source tower heat pumps
摘要：
在热源塔热泵实际运行过程中,溶液质量分数随运行时间的延长逐渐降低,其吸湿能力下降,冰点温度上升,进而对热源塔热泵的制热能力与稳定运行带来严重影响。因此,本文提出了配套热源塔热泵的甲酸钠防霜溶液冷冻再生机组,通过搭建实验台测试了该机组在预设工况下的再生性能表现,从结冰分离、溶质损失和余热利用效率3个方面评估了系统再生性能与热回收能力。结果表明,机组能够在5个再生循环中将稀溶液从初始质量分数13%提升至目标质量分数15%,平均分离比为34.8%;采用溶质回收循环后,溶质回收率为69.1%,溶质损失占比降为3.1%;在整个过程中,机组的有效热利用系数为1.56,除冰质量能耗比为0.332 kW·h/kg,具有较好的再生效率和较高的能效。
Abstract：
During the actual operation of the heat source tower heat pump(HSTHP), the mass fraction of the solution gradually decreases with the extension of operation time, leading to a decline in its moisture absorption capacity and an increase in freezing point temperature, which seriously impacts the heating capacity and stable operation of the HSTHP. Therefore, this paper proposes a sodium formate anti-frost solution regenerator unit using freezing concentration for the HSTHP. An experimental platform is built to test the regeneration performance of the unit under preset conditions. The regeneration performance and heat recovery capacity of the system are evaluated from three aspects: icing and separation, solute loss, and waste heat utilization efficiency. The results show that the unit can increase the mass fraction of the dilute solution from the initial 13% to the target fraction of 15% over 5 regeneration cycles, with an average separation ratio of 34.8%. After employing the solute recovery cycle, the solute recovery rate is 69.1%, and the proportion of solute loss is reduced to 3.1%. Throughout the process, the effective thermal utilization coefficient of the unit is 1.56, and the mass-energy ratio for ice removal is 0.332 kWh/kg, indicating good regeneration efficiency and high energy efficiency.
Keywords:heat source tower heat pump(HSTHP); sodium formate; anti-frost; solution regenerator unit using freezing concentration; regeneration efficiency; thermal performance analysis