浆态床反应器气体分布器的性能研究  

Study on performances of gas distributor for slurry-bed reactor

作　　者：陈强 蔡连波 盛维武 赵晓青 

机构地区：[1]中石化炼化工程(集团)股份有限公司工程技术研发中心,河南省洛阳市471003

出　　处：《炼油技术与工程》2015年第1期33-38,共6页Petroleum Refinery Engineering

摘　　要：在大型浆态床反应器冷模试验装置上,考察了新型气体分布器对反应器内流体力学性能的影响,主要从平均气含率、局部气含率、气泡尺寸及影响区的变化规律进行研究。同时对浆态床反应器内的气液两相流动状况进行了数值模拟研究,并将模拟结果与大型冷模试验结果对比分析,二者吻合较好,验证了数值模拟所用的k-ε双方程模型和欧拉多相流模型的可靠性与结果的可信性。结果表明,反应器内各个区域的气含率各不相同,但随表观气速的增加而增大;分布器轴向影响区域为高度200~300 mm,径向影响区域为直径140~150 mm;分布器的逆流速度一般小于10 m L/s;反应器下沿内部附近存在较大的涡旋,在实际操作过程中应当设计最佳的分布器结构和内构件的布置方式,消除涡旋,改善物料的接触效果和停留时间分布。The impacts of the gas distributor in the reactor on the performance of fluid mechanics were investigated on a large cold-run pilot plant of slurry-bed reactor. The average gas holdup,local gas holdup,bubble size and affected zone were studied. Numerical simulation of liquid-gas two-phase flow in a slurry bed reactor was performed,and simulation results were compared with the results of large cold-run pilot plant. The good agreement of them testified the reliability of applied standard k-ε model and Euler multiphase flow model.The study shows that the axial and radial gas hold-up distributions in different regions of the reactor are different,and the gas hold-up increases with increasing superficial gas velocity. The axial influence area of distributor is 200 ~ 300 mm in height,and radial influence area of distributor is for 140 - 150 mm in diameter. Counter current flow speed of distributor is less than 10 m L / s. Large eddies occur at the bottom of reactor. In commercial operation,the optimized gas distributor construction and distributor internals layout should be designed to eliminate eddies and improve the contact of effluents and distribution of residence time.

关 键 词：浆态床 泡罩式 气体分布器 CFX 内构件 

分 类 号：TE96[石油与天然气工程—石油机械设备]