Texaco气流床煤气化炉内气固两相流动的数值模拟  

Numerical simulation of gas-solid two-phase flow in a Texaco entrained-flow coal gasifier

作　　者：刘升[1] 郝英立[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学空间科学与技术研究院,南京210096

出　　处：《东南大学学报（自然科学版）》2009年第4期803-807,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217703)

摘　　要：应用Eulerian-Lagrangian方法对国内某工厂实际运行的Texaco气流床煤气化炉内气固两相流动进行了模拟.采用Realizablek-ε模型计算炉内复杂气体湍流运动,应用颗粒轨道模型追踪煤粉颗粒在湍流气流中的运动轨迹.通过数值计算取得了炉内气相速度矢量、颗粒运动轨迹、颗粒碰撞壁面并沉积于壁面的沉积通量和颗粒在炉内的停留时间分布.揭示了该气化炉的气固两相流动特性,并分析了运行工况对壁面沉积通量分布的影响规律.结果表明:气化炉内的气体流场存在回流,回流延长了颗粒在气化炉内的停留时间,颗粒沉积通量最大的位置为筒体段下部和锥体段上部;绝大部分颗粒在气化炉内的停留时间在5s以内,气体流量降低时颗粒在炉内的停留时间减少.Numerical simulation of gas-solid two-phase flow in a Texaco coal gasifier operated in a domestic factory in China was carded out using the Eulerian-Lagrangian approach. The realizable k-ε model was used to describe the turbulence gas flow in an Eulerian frame while the coal particle trajectories were calculated by a stochastic tracking model in a Lagrangian frame. The velocity vector of gas, particle trajectories, particle deposition on inner wail, and particle residence time in the gasifier were acquired through numerical calculation. The results indicate that back flow exists in the gas flow field, which increases the particle resistance time in the gasifier. The largest deposition rate appears at the bottom of cylinder part and the top of pyramid part of the gasifier. Most of the particle has a resistance time of less than 5 s in the gasifier, and the resistance time decreases with the reduction of gas flow rate.

关 键 词：气流床煤气化炉 颗粒轨迹 沉积率 停留时间 

分 类 号：O359[理学—流体力学]