溴化锂水溶液在倾斜平板上绝热吸收过程的数值模拟

Numerical Simulation of Adiabatic Absorption of Lithium-bromide Solution on Sloping Desk

提出了溴化锂水溶液在倾斜平板上的绝热吸收模型,对该模型进行了数值计算,得出了下落液膜内的温度、浓度分布的解析值。讨论了斜板尺寸和进口温度、浓度及吸收压力等参数对传热传质性能的影响。计算结果表明,吸收斜板的倾角、板长等对传热传质的影响较大,而传热传质分离的绝热吸收形式与传统的管外降膜吸收相比,传质系数也有很大的提高。

A mathematical model for adiabatic absorption of lithium-bromide on sloping desk is presented and the model is solved by the use of numerical method. An analytical solution of temperature and concentration distribution is obtained. The influences of the angle of tilt and the inlet temperature and concentration and the absorption pressure on the performance of heat and mass transfer are discussed. The results of the numerical method show that the effect of angle and length of sloping desk on the heat and mass transfer are greater. The transfer coefficient of adiabatic absorption give greater enhancement compares to the nonadiabatic horizontal tube of falling film absorption.