加氢反应器气液分配盘数值模拟

Numerical Simulation of Gas-Liquid Distribution Plate in Hydrogenation Reactor

以加氢反应器UOC(Union Oil Company)型气液分配盘为对象,利用计算流体力学(CFD)方法对分配盘内的气液两相流动进行了研究。根据某工厂数据确定了分配盘的几何尺寸,应用原油和氢气为介质,使用群体平衡模型(PBM)等多种计算模型进行计算。计算结果表明,UOC型气液分配盘是依据分配盘上单个分配器的内外压力差作为动力,氢气与原油在分配器内外进行充分的碰撞,达到混合及分配效果。原油通过分配盘后以多个点状峰值状态存在,分配器存在中心聚集现象,消除分配器的中心汇聚现象为其结构改进的主要方向。

The Computational Fluid Dynamics(CFD)method was used to study the gas-liquid two-phase flow in the Union Oil Company(UOC)type distribution plate of the hydrogenation reactor.According to the data of a factory,the geometric dimensions of the distribution plate were determined and the calculations were completed using the Population Balance Model(PBM)and other calculation models with the crude oil and hydrogen gas as medium.The results showed that UOC gas-liquid distributor was driven by the difference of the internal and external pressure of the distributor on the distribution plate,and the hydrogen and the crude oil were fully collided inside and outside of the distribution plate to mix and distribute.The crude oil existed in many dot-like peak spots after the oil passed through the distribution plate and the central agglomeration phenomenon was observed.Eliminating the central convergence phenomenon of the distributor would be the main direction of its structural improvement.