摘要
在气、固两相流体动力学模型的基础上,采用基于机理反应的14集总模型,考虑了反应温度、局部固体浓度变化以及流动对重油催化裂化反应的影响,建立了重油催化裂化流动-反应耦合模型;采用该模型计算了提升管反应器内气、固两相流动形态。结果表明,提升管内气、固两相沿轴向、径向和切线方向的流动不均匀,并非完全对称流动,而以S型螺旋形上升流动。受喷嘴区高速射流的影响,喷嘴上方固体颗粒呈向下流动趋势,形成一个诱导回流区域。
Based on gas-solid two-phase turbulent flow model and the 14 lumped molecular kinetic FCC model, a three-dimension flow-reaction coupling model was derived to simulate the heavy oil cracking reaction and the two-phase flow pattern in riser reactor. The influences of the local solid concentration and hydrodynamic behavior of the gas-solid two phase flow on the real FCC reaction were investigated. The simulation results showed that the flow of gas-solid two-phase was non-uniform in axial, radial and tangential directions, and was not symmetric flow as expected, but was up in S-type form. Induced by the high-speed feed jet flow, the solid particles above the feed nozzle tended to flow down, and a reverse flow zone was formed along the riser wall.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2005年第5期19-27,共9页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
流化催化裂化
数值模拟
计算流体力学
fluid catalytic cracking
numerical simulation
computational fluid dynamics
