Abstract: Plate falling film absorber with film-inverting configuration is a new kind of absorber that combines plate falling film absorption and film-inverting technique.By analyzing the fluid flow，heat and mass transfer processes in the absorber，a theoretical mathematical model was established.The control equation of the model was transformed by the flow function， discretized by the finite difference method， and used to numerically solve the case of lithium bromide solution falling film absorbed by using the TDMA algorithm.Comparison and analysis were made between the calculated result of the film-inverting plate falling film absorber and that of a same length vertical plate falling film absorber.It was shown that the newly developed absorber had better performance than the traditional plate falling film absorber under the same boundary and inlet conditions.

Key words: 传热传质, 吸收器, 降膜, 膜反转

摘要： 将板式降膜吸收和膜反转技术相结合，开发了一种新形式的降膜型吸收器，即膜反转板式降膜吸收器.通过对这种吸收器进行流动传热传质分析，建立了描述其物理过程的数学模型，采用流函数将控制方程进行变换，用有限差分法将变换后的方程离散，由TDMA方法编程计算这种膜反转板式降膜吸收器溴化锂溶液降膜吸收的过程，对比分析板式、膜反转板式降膜吸收计算结果表明，在同样的条件下膜反转板式降膜吸收器比板式降膜吸收器传热传质性能更好.

关键词: 传热传质, 吸收器, 降膜, 膜反转