摇摆状态下TFE/NMP降膜吸收理论研究

Theoretical Study on Falling Film Absorption Inside Swaying Tube with TFE/NMP Solution

根据船用条件下吸收器内溶液降膜吸收的特点 ,建立了摇摆状态下垂直管TFE NMP降膜吸收过程中动量、热量和质量传递的物理和数学模型。模型中充分考虑了转动附加惯性力对降膜流场中液膜厚度、速度、温度和浓度分布的影响。采用膜内积分与全隐式有限容积相结合的数值方法求解理论模型。通过对计算结果的分析 ,可以发现 ,在摇摆状态下TFE NMP降膜吸收过程中 ,由于转动附加惯性力的存在 ,液膜内速度。

According to the characteristics of the falling film absorption in the absorbers employed on boats, a physical and mathematical model of momentum, heat and mass transfer of falling film absorption in a swaying tube with TFE/NMP solution was established. The model takes into account the effects of swaying accessional inertia forces on the distributions of film thickness, velocity, temperature, and concentration of falling film. A combination of integral and completely implicit finite volume method was adopted to solve the governing equations. By analyzing the computational results, it is shown that the distributions of the parameters inside the falling film, such as velocity, temperature, and concentration, take on the traits of periodicity and symmetry due to the existence of the swaying accessional inertia forces in the process of the falling film absorption under a swaying status using TFE/NMP as working fluid.