气液鼓泡床泡罩式气体分布器流场的CFD模拟

CFD Simulation of Bubble-type Gas Distributor’s Flow Field for Gas-Liquid Bubble Column

采用ANSYS FLUENT商用CFD软件对气液鼓泡床内泡罩式气体分布器单体进行了数值模拟。以Ug=12.34m/s的入口速度对计算模型进行单相三维稳态模拟。研究了泡罩内径、泡罩齿片和入口管开孔分别对塔内不均度和泡罩式气体分布器的压降影响规律。研究表明,随着泡罩内径的增加,塔内不均度和分布器压降减小;泡罩齿片加宽,齿片对气体的阻力增加;齿片间距增加,齿片对气体的阻力减小;入口管开孔数对塔内不均度没有任何影响。开孔数很少时,开孔数量的增加使分布器的压降减小,然而开孔数增加到一定数量时,开孔数对分布器的压降影响甚微。对泡罩式气体分布器进行了结构优化。

The ANSYS FLUENT was used to implement numerical simulation of the flow field of bubble-type gas distributor for the gas-liquid bubble column. Basing on an inlet gas velocity （ Us = 12.34m/s）, the 3D single-phase steady simulation of the calculation model was implemented, including the study on the influence of bubble cap＇ s inner diameter, blade and the pipe hole on the bubble column＇ s uneven degree and the gas distributor＇ s pressure drop. The results show that with the increase of bubble diameter, both bubble column＇ s uneven degree and the distributor＇ s pressure drop become decreased; and widening bubble blade can reduce blade＇ s resistance to the gas; increasing the blade spacing, the blade＇ s resistance to the gas becomes de- creased ; the number of inlet pipe＇ s openings has no effect on the bubble column＇ s uneven degree ; with few openings, the increase of the number of openings can make distributor＇s pressure drop decrease, and having the opening increased to a certain number, the number of the openings has little effect on distributor＇ s pres- sure drop. The bubble-type gas distributor＇s structure was optimized.