催化重整固定床径向反应器结构的优化研究  

The Optimization on Structures of Catalytic Reforming Fixed-Bed Radial Reactors

作　　者：孙守峰[1] 蓝兴英[1] 马素娟[1] 高金森[1] 

机构地区：[1]中国石油大学重质油国家重点实验室,北京102249

出　　处：《高校化学工程学报》2008年第2期252-258,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：教育部新世纪优秀人才支持计划(NCET-04-0107)

摘　　要：催化重整固定床反应器(Catalytic Reforming Fixed Bed Reactor,以下简称CRFBR)传递及反应过程的综合数学模型是以流体力学的基本微分方程为基础,考虑了流体的湍流流动,多孔介质内流体流动、传热、传质等过程,结合催化重整集总反应动力学模型而建立的。采用该模型对工业催化重整径向反应器进行数值模拟计算,考察了反应器入口分配器设置、催化剂床层空隙率分布情况、催化剂填装比、反应器底部结构四个因素对产物组成的影响,从而确定优化的反应器结构和理想的催化剂填装情况。结果表明,反应器入口分配器采用单层效果较好,并确定了分配器的最佳位置;分析了催化剂床层空隙率分布不均对床层轴向温度、压力、组份浓度分布的影响;确定了最佳的催化剂填装比为1:1:2:4;针对反应器底部床层温度分布不均的情况改善了反应器底部结构,效果较好。Based on the basic differential equations of fluid flow,heat transfer and mass transfer in porous media bed,together with k-ε turbulence model,and coupling with reforming reaction kinetic model,a mathematical model integrating the transport phenomena and reacting process of the catalytic reforming fixed bed reactor（CRFBR） was developed in our previous work.Using the mentioned model,the numerical simulations of the commercial CRFBR were carried out to investigate the effects of inlet distributor setting,fixed-bed porosity dispersion,catalyst stacking ratio and the reactor bottom structure on the products compositions,and thus the optimal arrangement of the reactor structures and catalyst stacking situation were determined.The results show that the monolayer distributor has a better effect,and its optimal locating position was confirmed.The effects of the inhomogeneous dispersion of fixed-bed porosity on axial temperature,pressure and species concentration profiles were analyzed,and the optimal catalyst stacking ratio in the four reforming reactors in series was found as 1：1：2：4.In order to alleviate the inhomogeneity of the temperature profiles at the bottom of the beds,the bottom structure of the reactors was improved,and good result was obtained.

关 键 词：催化重整 固定床 传递 结构参数 数值模拟 

分 类 号：TQ051.14[化学工程] TQ021.8