基于多孔介质加氢裂化反应器多相流数值模拟

采用欧拉多相流模型，通过建立多孔介质能量守恒模型、热量传递模型和质量传递模型，对加氢裂化反应器内的多相流动、传热和传质进行了数值模拟计算，得到了反应器内多孔介质床层的速度场、温度场、浓度场和压力分布。结果表明，多相流模型的选取、传热传质模型的建立、油品物性的计算和边界条件的设置能够较准确地描述三相流动状态及其分布状态。反应器入口处的流动状况将直接向内部传递，壁面流随流动而发展，其宏观描述为：在出口床层处径向体积分率曲线出现拐点，进而使流体在催化剂床层径向和轴向分布不均匀，气化率得到提升。为了获得反应介质与催化剂充分混合的流体分布状态，有效利用催化剂，反应器入口处的流动状态必须得到优化。

Computational Fluid Dynamics of Multiphase Flow in Hydrocracking Reactor Based on Porous Media

The Eulerian multiphase flow model,the energy conservation model,heat transfer and mass transfer model were used to numerically simulate the multiphase flow,the heat and mass transfer within the porous media of the hydrocracking reactor.The overall flow field in the porous media bed,temperature distribution,mass transfer and the pressure distribution of the hydrocracking reactor were obtained.The results showed that the multiphase flow model selection,heat and mass transfer models and computational model could more accurately describe the state and distribution of three-phase flow.The flow conditions at the entrance of the reactor will be passed directly to the interior,surface flow of the reactor will be the current developed,from the macro view,which could be described as the radial bed in the export volume fraction curve inflection point,and then the fluid in the radial and axial direction of the catalyst bed uneven distribution of gasification rate may be raised.Finally in order to get a better bed fluid distribution in the reactor,and get a full used of the catalyst efficiency,the reactor must be optimized at the entrance boundary conditions.