下行床反应器内催化裂化过程的CFD模拟  

CFD SIMULATION OF FCC PROCESS IN DOWNER REACTORS

作　　者：郑雨[1] 魏飞[1] 金涌[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《化工学报》2003年第8期1078-1086,共9页CIESC Journal

基　　金：国家自然科学基金资助项目 (No 2 0 1760 2 4)~~

摘　　要：耦合湍流气粒多相流模型和催化裂化集总动力学模型 ,建立了描述下行床内多相流动和催化裂化过程的反应器数学模型 ,并利用计算流体力学单元模拟软件CFX4 3对下行床内的催化裂化过程进行了数值模拟及分析 .模型能预测出在工业应用中反应器内最受关注的诸多参数 ,如固含率、相间滑移速度、压降、气固相的加速区以及各组分浓度的分布情况 .预测结果表明 ,气相反应的进行将导致反应器内的气粒流动行为发生较大变化 ,充分考虑反应与流动行为的耦合十分重要 ;A mathematical model is developed to predict the two-phase flow and fluid catalytic cracking (FCC) process inside a downer reactor by coupling a turbulent gas-particle multiphase flow model, which describes the flow behavior, with some lumping kinetic models, which simulate the cracking reaction inside the reactor. The model equations are coded and solved by CFX4. 3 package, a general computer program for unit simulation involving fluid, heat transfer or chemical reaction. The model can predict some important engineering aspects for a reactor such as solids holdup, interphase slip velocity, pressure drop, acceleration zone for both phases and yields distribution all over the reactor. The predictions reveal that flow behavior is significantly changed when cracking reaction takes place inside downer reactors and the scale-up of reactors can cause reduction of yield.

关 键 词：下行床 催化裂化 集总动力学 计算流体力学 

分 类 号：TQ021[化学工程]