载体内循环膜分离反应器的水力学性质及气液传质特性研究

Study on the Hydrodynamic Property and Gas-liquid Mass Transfer Efficiency in a Membrane Separation Reactor with Inner-loop Carriers

通过清水实验考察了载体内循环膜分离反应器的水力学性质及气液传质性能。结果表明,在固相含率为2%~8%、液流量为0~16 L/h时,反应器达到循环流态化需要的临界气速为6.2~7.7 m/h;投加载体后,气相含率和氧传质系数随着气速的增加而增大,随着固相含率的增加而减小,在固相含率为0~6%、液流量为5.3 L/h、气速为7.5~30.1 m/h时,反应器的气相含率介于0.65%~3.5%之间,氧传质系数在8.32~28.0 h-1之间变化;循环时间和混合时间都随着气速及固相含率的增加而减小,在固相含率为0~6%、液流量为5.3 L/h、气速为3.8~22.6 m/h时,循环时间为2.9~34 s,混合时间为10.2~41.9 s。

The hydrodynamic property and gas-liquid mass transfer efficiency of membrane separation reactor with inner-loop carriers was studied in the tap water test.The result showed that the critical gas velocity needed by circulation fluidization state was 6.2~7.7 m/h when the carrier holdup and liquid flow were 2%~8% and 0~16 L/h,respectively.After the carrier was added,the gas holdup and oxygen transfer coefficient can be improved with the increase of gas velocity and be reduced with increase of carrier holdup.G...