喷雾塔内雾粒粒径对传质行为的影响

Influence of Drop Size on Mass Transfer in A Spray Column

本文研究了喷雾塔内的两相混合及雾粒粒径对传质行为的影响.建立了描述粒子群在塔内运动和传质规律的数学模型,这一模型既考虑了两相的返混,也考虑了粒径的影响,即所谓粒子群的向前混合.通过稳态浓度剖面法求解模型方程,得到了两相的返混准数Pe_x、Pe_y及粒子的真空传质系数K_(oco)用线性最小二乘法关联得到计算这些参数的经验方程.这些关联式可用于计算塔内的真实浓度剖面,并能适用于不同结构和尺寸的喷嘴.

The mixing of two phases and the influence of drop size on mass transfer were studied in a spray column with pneumatic nozzle. A mass transfer model including the effects of backmixing and drop size distribution ot the dispersed phase was established. The equations of the model were solved by the steady-state concentration profile method. The backmixing numbers (Peclet Numbers) of two phases and the true mass transfer coefficients of the drops were obtained. The equations can be used to calculate the concentration profile in a spray column with pneumatic nozzles of different structure and size.