开式吸收式热泵降膜吸收器热质传输研究

ANALYSIS OF HEAT AND MASS TRANSFER OF THE FALLING FILM ABSORBER IN THE OPEN CYCLE ABSORPTION HEAT PUMP

针对开式循环吸收式热泵系统中的吸收器,建立了竖直管降膜式吸收器模型,分析了吸收器内部的热质传输规律,并将拟合的传质系数与实验结果进行了比较。计算结果表明,溶液浓度升高最利于水蒸汽吸收,溶液温度升高有利于热的回收利用,增大降膜管径及增加降膜管长度均利于吸收过程的进行。计算结果可为此类吸收器的设计提供参考。

A falling film absorber was selected in this paper for the open cycle absorption heat pump which is used to recycle the latent heat and water in the flue gas from gas boiler or humid gas cycle （HAT cycle）. A steady-state model was developed and the heat and mass transfer processes was simulated. Comparing to the experimental results, the heat and mass transfer coefficients predicted from empirical correlations was reasonable. A parametric analysis was also conducted, the results showed strong solution concentration is beneficial to water absorption and high solution temperature is beneficial to heat recycle. The absorption process would be strengthen by increasing the diameter or the length of the tube, which can give a reference to the absorption design.