带有Kenics静态混合器的水平液固两相流化床换热管的压降研究

摘要

By setting a Kenics static mixer into the device of horizontal liquid-solids two-phase fluidized bed heat exchange tube,experiment was performed using saturated calcium sulfate solution as working medium. The pressure drop results of the horizontal liquid-solids fluidized bed heat exchange tube with a Kenics static mixer were presented. The effects of working fluid velocity,Kenics static mixer twist ratio,solids volume fraction and size on pressure drop were discussed,and compared with the variation of pressure drop in cold state. The pressure drop of setting the Kenics static mixer in heat exchange tube was found to be about 20%-140%over the case without setting the Kenics static mixer under the same operation conditions. Pressure drop increased with increasing Reynolds number and decreased with increasing twist ratio. Moreover,pressure drop was found to increase with increasing volume fraction,but the effect was not significant. On the basis of experiment data,an empirical equation for pressure drop was established. It provides some theoretical information for the optimal design of the liquid-solids two-phase fluidized bed.%以饱和硫酸钙为介质，在安装 Kenics静态混合器的水平液固两相流化床换热管上进行实验研究，考察介质流速、Kenics 静态混合器扭率、颗粒体积分数及颗粒尺寸对压降的影响，并与冷态实验条件下的压降变化规律进行比较。结果表明：同等操作条件，安装Kenics静态混合器后压降比安装前提高20%～140%；压降随雷诺数的增大而增大，随 Kenics 静态混合器扭率的增大而减小；颗粒体积分数对压降也有影响。根据实验数据，得出了稳定操作条件下压降与上述影响因素之间的经验关联式，为带有 Kenics 静态混合器的水平液固两相流化床换热器的设计提供计算依据。