Abstract:

Based on the problem of moisture absorption in winter for heat source tower, a novel solution regeneration system is proposed in this paper. The corresponding test bench is constructed to carry out the relevant experimental tests. Considering with the balanced temperature field in the initial operation and the phenomenon of solution thicken with the water seperation from solutionin, the unsteady characteristics of the solution regeneration system during start-up are studied, and the variation of the operation parameters with the initial running times is obtained. Simultaneously the regularity of operation parameters with different concentration is studied. The results show that: with the increase of initial operation times, under the condition that the total running water quantity remains unchanged, the energy consumption for a single operation decreases, the condensate water rate increases, and finally the system tends to be stable. With the increase of solution concentration, the regeneration efficiency increases first and then reduces. When the solution concentration is 18.5%, the regeneration efficiency reaches the maximum. Simultaneously the regeneration efficiency is 4.28 kg/(kW·h), and the regeneration rate is 749 kg/d. The regeneration percentage is 14%. In the system, low pressure boiling process of the solution is combined with the condensation process, and the energy efficiency is great.

Key words: unsteady state, boiling and condensation, regeneration efficiency, heat-source tower

摘要：

针对热源塔冬季运行时存在的吸湿问题，构建了一种新型热源塔溶液再生系统并对其进行实验测试。考虑到系统在初始运行时需要建立平衡的温度场且系统运行时存在溶液不断变浓的现象，对该溶液再生系统启动时的非稳态特性进行了研究，获取了各运行参数随初始运行次数的变化规律，同时对不同浓度下各运行参数变化规律进行了实验分析。实验结果表明：初始开机运行后，随着运行次数的增多，在总运行水量保持不变的情况下，单次运行所需电量呈下降趋势，冷凝水量呈上升趋势，最终系统趋于稳定。随着溶液浓度的变化，系统再生效率存在先增加后降低的趋势，当溶液浓度达到18.5%时出现最佳值，此时再生效率为4.28 kg/(kW·h)，再生速率为749 kg/d，再生百分比为14%。该装置将溶液的真空沸腾过程和冷凝过程融合在一起，系统能耗大大降低，具有较好的节能效果。

关键词: 非稳态, 沸腾冷凝, 再生效率, 热源塔