鼓泡塔反应器中两相流动CFD-PBM耦合数值模拟  

CFD-PBM Coupled Numerical Simulation of Two Phase Flow in Bubble Column Reactor

作　　者：贾翔飞 钱嘉澍 吴幼青[2] 陈剑佩[1] JIA Xiangfei;QIAN Jiashu;WU Youqing;CHEN Jianpei(State Key Laboratory of Chemical Engineering;Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]华东理工大学煤气化及能源化工教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2021年第1期1-10,共10页Journal of East China University of Science and Technology

基　　金：国家重点研发计划(2018YFB0604602)。

摘　　要：针对气液体系,将一个新型气泡破碎模型植入群体平衡模型(PBM)并与欧拉双流体模型进行耦合,在内径0.44 m、高2.43 m的鼓泡塔中对气-液两相流动进行模拟。在对破碎模型的气泡破碎速率和子气泡分布预测值进行验证后,将计算流体动力学-群体平衡耦合模型(CFD-PBM)在不同表观气速下的气含率、轴向液速模拟值与实验值进行了对比,并探究了升力的加入对模拟结果的影响。结果表明,模拟过程中升力的加入使气含率和轴向液速的径向分布更接近实验值。低表观气速和高表观气速下模型的计算数据与实验数据均吻合良好。同时,随着表观气速增大,反应器内的湍动耗散率增加,气泡之间的相互作用力增强,使得反应器内气泡尺寸分布范围变宽。Reasonably describing gas-liquid interaction force and bubble size distribution is key to accurately simulate the hydrodynamic parameters of bubble column.For the gas-liquid system,a new bubble breakup model was implemented into the population balance model(PBM)and coupled with the Euler two-fluid model.The mechanisms of bubble coalescence included coalescence due to turbulent eddies,different bubble rise velocities and bubble wake entrainment,and bubble breakup model,energy constraint and pressure constraint were considered.The gas-liquid twophase flow in a bubble column with an inner diameter of 0.44 m and a height of 2.43 m was simulated.Firstly,the predicted values of bubble breakup rate and daughter bubble size distribution of the breakup model were verified.Then,the gas holdup and axial liquid velocity predicted by coupled model at different superficial gas velocities were compared with experimental values.Moreover,the effect of lift force to model(prediction result)was investigated.The results show that both gas holdup and axial liquid velocity are improved in radial distribution when the lift force is included.The simulation value of the CFD-PBM coupled model agrees well with the experimental data at low and high superficial velocity.Both the turbulent dissipation rate in the reactor and the interaction between the bubbles rise with an increase in superficial gas velocity,which make the distribution range of bubble size widened.

关 键 词：鼓泡塔反应器 群体平衡模型 双流体模型 计算流体动力学 

分 类 号：TQ519[化学工程]