对二甲苯搅拌式反应器增设导流简的流体力学

在高径比为1．0的搅拌反应器中，研究了导流筒结构及固体含量对翼型轴流桨功耗与气含率的影响。研究发现导流筒的安装会降低功耗，提高气含率；导流筒的开孔率以16．4％为佳；翼型桨排出流向上时功耗较小，气含率较高；功耗随固体含量的增加而增大；气液两相体系中的气含率比气液固三相体系中的气含率高；并得到在开孔率为16．4％条件下，翼型轴流桨上提操作时的气含率关联式。此外，在高径比为1．5时对双层组合桨进行了研究，并得出了与单层桨类似的结论。

Hydrodynamics of an Agitated Reactor with Draft Tube for p-Xylene Oxidation

In an agitated reactor with hydrofoil impeller, effects of draft tube structure and solid content on power consumption and gas holdup were investigated. Single impeller was used when the liquid height to tank diameter ratio was 1.0. With the aid of draft tube, the power consumption decreased while the gas holdup increased. The optimal holes area ratio of draft tube was 16.4%. Lower power consumption and higher gas holdup were obtained when the hydrofoil impeller was upward. Power consumption increased with the increasing of solid content. The gas holdup in gas-liquid system was found to be much greater than that in the gas-liquid-solid system. The correlation formula of gas holdup was obtained when the holes area ratio of draft tube was 16.4% and the hydrofoil impeller was upward. Furthermore doublecombined impellers were installed when the liquid height to tank diameter ratio was 1.5 and the similar conclusions as single impeller were obtained.