温压耦合特性对吸附制冷解吸性能的影响

doi:10.11949/j.issn.0438-1157.20170858

摘要/Abstract

摘要：

在太阳能吸附制冷循环解吸过程中传质性能受到非稳定热源温度的限制，而压力调节可作为强化传质的有效补偿手段。通过构建活性炭-甲醇工质对的恒温解吸理论模型给出了解吸率、解吸速率的表达式，对变压强化传质效果进行计算，揭示了温度与压力变化对解吸率的影响规律。计算结果显示系统压力降低10 kPa可等效于热源温度升高了6～8℃。搭建了以活性炭-甲醇为工质对的吸附单元管吸附制冷平台，实验结果显示当解吸温度分别为90、100和110℃时，系统压力降低14 kPa后，解吸率分别提高了20.5%、15.1%和12.1%，平均解吸速率分别提高了49.3%、44.6%和37.1%，与理论计算吻合较好。得出了温度与压力对解吸性能影响的耦合关系，并对实际太阳能吸附制冷系统变压解吸方法给出建议。

关键词: 解吸, 传质, 解吸温度, 系统压力, 实验验证

Abstract:

The mass transfer performance is limited by the unstable heat source temperature during the desorption process of a solar energy adsorption refrigeration cycle. However, the pressure regulation can be used as an effective compensation method for mass transfer enhancement. The expressions of desorption ratio(l) and desorption rate are given by building a theoretical model of constant temperature desorption. The effect of mass transfer enhancement through pressure swing was calculated. The theoretical results revealed the regularities that the desorption ratio(l) would increase with the decrease of the system pressure at different desorption temperatures. The results showed that there were the same effects on the improvement of desorption rate through reducing the pressure of the system of 10 kPa or increasing the heat source temperature of 6-8℃. In addition, a solar adsorption unit tube adsorption refrigeration platform with activated carbon-methanol as working pair was constructed. Experiments were carried out under different desorption temperatures and system pressures, and the theoretical results were verified by experiments. The results showed that when the system pressure decreased by 14 kPa, at the desorption temperature of 90℃, 100℃ and 110℃, the desorption ratio(l) increased by 20.5%, 15.1% and 12.1%, and the average desorption rate increased by 49.3%, 44.6% and 37.1%, respectively. The experimental results are in good agreement with the theoretical calculation. The coupling relationship between the temperature and pressure on desorption performance was obtained. Finally, the method of lowering pressure for enhanced desorption is proposed in a practical application of solar adsorption refrigeration system.

Key words: desorption, mass transfer, desorption temperature, system pressure, experimental validation

中图分类号:

TK519

杜文平, 李明, 王云峰, 何京鸿, 冯志康, 张晓蝶. 温压耦合特性对吸附制冷解吸性能的影响[J]. 化工学报, 2018, 69(4): 1445-1453.

DU Wenping, LI Ming, WANG Yunfeng, HE Jinghong, FENG Zhikang, ZHANG Xiaodie. Influence of temperature-pressure coupling characteristics on desorption performance of adsorption refrigeration unit[J]. CIESC Journal, 2018, 69(4): 1445-1453.

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