小型提升管反应器流动-反应耦合模拟

Flow-Reaction Coupled Simulation in a Small Riser Reactor

在提升管气固两相湍流流动模型和重油反应动力学集总模型的基础上,利用Fluent软件建立了催化裂化提升管反应器气固两相流动与反应耦合模型,对实验室小型提升管反应器进行了数值模拟,考察了气固两相的流动、传热、传质与反应过程。结果表明,提升管反应器内气固两相在轴向和径向的流动、传热与反应的分布不均匀。在入口附近。原料和催化剂温度变化显著,各组分的浓度变化剧烈,在提升管上部,变化平缓。反应器出口各组分质量分数的模拟值和实验值基本吻合。说明该模型对提升管反应器出口参数和反应结果具有较好的预测性。

A two dimensional gas-solid two-phase flow and reaction model for the fluid catalytic cracking （FCC） riser reactor was established by means of Fluent software based on two dimensional gas-particle two-phase turbulent flow model and detailed lumping kinetics of heavy oil catalytic cracking reactions to investigate the flow, heat transfer, mass transfer and cracking reactions in the FCC riser reactor. The results showed that the axial and radial distribution of flow, heat and mass transfer of gas-solid two-phase was very uneven in the reactor. The temperature of gas and particle and the concentration of each component changed rapidly near the entrance, while changed smoothly in the upper part of the riser. The simulation results of the mass fractions of each component at the outlet of the reactor agreed well with the experimental results, which indicated that the flow-reaction model had good predictability for outlet parameters of the riser reactor.