下行床入口分布器的计算流体力学模拟研究  

COMPUTATIONAL FLUID DYNAMICS SIMULATION OF GAS-SOLID DOWNER DISTRIBUTOR

作　　者：刘文明 袁起民[1] Liu Wenming;Yuan Qimin(SINOPEC Research Institute of Petroleum Processing,Beijing 100083)

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油炼制与化工》2022年第8期73-78,共6页Petroleum Processing and Petrochemicals

基　　金：中国石油化工股份有限公司合同项目(119044)。

摘　　要：针对下行床入口分布器难以兼顾颗粒浓度增加(增浓)和均匀分布的问题,基于下行床中气固两相流动机制提出了一种适用于下行床颗粒增浓的新型入口分布器,利用已开发的结构曳力模型耦合CFD软件考察了下行床流体力学性能。模拟结果表明:结构曳力模型模拟结果与试验结果一致,说明该模型能够准确预测下行床床层固含率的分布;相对于传统入口分布器,采用了分区流化、文丘里式溢流管和漏斗式设计的新型入口分布器的轴向固含率分布更加均匀;在新型入口分布器颗粒循环量为700 kg/(m^(2)·s)条件下,下行床反应器床层平均固含率可达0.06,且均匀分布;气速和颗粒循环量对下行床颗粒增浓的程度不同,颗粒循环量是床层内颗粒增浓更为关键的调控因素。In order to solve the problem that it is difficult to take into account both high solids holdup and uniform gas-solid distribution in the inlet distributor of the downer,a novel gas-solid distributor for particle concentration in downers was proposed based on the mechanism of gas-solid two-phase flow in downer.The performance of downer fluid mechanics was investigated by using the developed structural drag model coupled with computational fluid dynamics software.The simulation results showed that the simulation results of the structural drag model were consistent with the experimental data.Compared with the distributor in the literature,the novel distributor is more uniform with the design of subarea fluidization,Venturi type overflow pipe and funnel type.When the solids circulation rate was up to 700 kg/(m^(2)·s),the overall solids holdup could reach 0.06 with uniform gas-solid distribution.Furthermore,the solid circulation rate plays a more sensitive role in increasing solids holdup than the gas velocity.

关 键 词：下行床 入口分布器 模拟 固含率 

分 类 号：TE96[石油与天然气工程—石油机械设备]