FCC汽油加氢脱硫四集总反应动力学数值模拟

 采用欧拉多相流模型、四集总反应动力学模型、多孔介质传热模型和层流有限速率模型，对FCC汽油加氢脱硫反应器内的多相流动、反应和传热进行了数值模拟计算，考察了多孔介质床层的速度场、温度场、脱硫率和影响脱硫率的各操作参数。结果表明，多相流和传热模型的选取、集总参数的求解和等价反应模型的设置能够较准确地描述三相流动状态及温度分布状态，四集总反应动力学模型结合层流有限速率模型能较准确地模拟计算脱硫率高达94%(质量分数)的深度脱硫过程。在该模型良好的适应性和外推性的基础上，计算了体积空速、反应压力和氢/油体积比3个操作参数对FCC汽油加氢脱硫率的影响。

Computational Fluid Dynamics Simulation of Four Lumped Reaction Dynamics of FCC Gasoline Hydrodesulfurization

Four lumped kinetic model,Eulerian multiphase flow model,the heat transfer model in porous zone,and laminar finite rate model were used to simulate the FCC gasoline hydrodesulfurization,such as multiphase flow within the porous media,reaction and heat transfer in reactor.The velocity field in the porous media bed,the temperature distribution in reactor,desulfurization efficiency and the operating parameters affecting desulfurization efficiency were mainly studied.The results showed that the state and distribution of three-phase flow and the temperature distribution in reactor could be more accurately described by the selection of multiphase flow and the heat transfer model,the solution of lumped parameter model and the equivalent reaction mechanics settings in reaction model.Four lumped kinetic model integrate with laminar reaction finite rate model can be used to more accurately simulate the higher deep desulfurization process with desulfurization rate of up to 94%.Based on the better fit and extrapolation of the model,the effects of operating parameters,such as liquid hourly space velocity,reaction pressure and volume ratio of hydrogen to oil,on the desulfurization rate of FCC gasoline were investigated.