不同结构气化炉激冷室气液两相流的数值模拟

Numerical simulation of gas-liquid two-phase flow in gasifier quench chamber with different structures

针对目前工业用激冷室存在的粗合成气洗涤效果不佳、破泡器堵渣等问题,提出了改变液池直径与下降管直径之比、在床层内减少破泡条、调整单层破泡条节距等调整方案,基于双流体模型和群平衡模型对含破泡条的激冷室进行了三维CFD模拟,比较了70%、100%、110%负荷下的液相含率、速度分布、湍动能分布、涡分布、气泡直径分布等,结果表明:调整后激冷室中的气泡直径更小,洗涤效果更好,气液两相传质传热更加充分,且能适应不同负荷工况。

Aiming at the problems of poor scrubbing effect of crude syngas and slag blocking of bubble breaker in industrial quench chambers,the proposal was made for such adjustment schemes as changing the ratio of liquid pool diameter to downcomer diameter,reducing the bubble breaking strips in the bed layer and adjusting the pitch of single-layer bubble breaking strip.Based on the dual-fluid model and population balance model,3D CFD simulation was conducted on the quench chamber with bubble breaking strip,and the liquid phase volume fraction,velocity distribution,turbulent kinetic energy distribution,vortex distribution,bubble diameter distribution under 70%,100%and 110%loads were compared.The results showed that after the adjustment,the bubble diameter in the quench chamber was smaller,the scrubbing effect was better,the gas-liquid two-phase mass and heat transfer was more complete,and it could adapt to different load conditions.