石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (3): 600-608.doi: 10.3969/j.issn.1001-8719.2020.03.020

• 研究报道 • 上一篇    下一篇

催化裂化管式待生剂分配器颗粒分配特性及内部流动特性的CPFD模拟

杨赛飞1,张永民1,付明义2,杨智君1   

  1. 1. 中国石油大学 重质油国家重点实验室,北京 102249;
    2. 山东京博石油化工有限公司,山东 滨州 256500
  • 收稿日期:2019-04-07 修回日期:2019-10-30 出版日期:2020-05-25 发布日期:2020-07-21
  • 通讯作者: 张永民,男,研究员,博士,主要从事石油化工多相流反应工程领域研究,Tel:010-89731269,E-mail:zym0876@sina.com E-mail:zym0876@sina.com
  • 作者简介:第一作者:杨赛飞,女,硕士研究生,从事化工过程机械方面的研究
  • 基金资助:

    国家自然科学基金项目(21276273)资助

CPFD Simulation on Particle Distribution and Inner Hydrodynamics in the Pipe FCC Spent Catalyst Distributor

YANG Saifei1,ZHANG Yongmin1, FU Mingyi2, YANG Zhijun1   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2. Shandong Chambroad Petrochemicals Co., Ltd., Binzhou 256500, China
  • Received:2019-04-07 Revised:2019-10-30 Online:2020-05-25 Published:2020-07-21

摘要: 基于CPFD(Computational particle fluid dynamics)方法,对实验室前期研究的催化裂化管式分配器内的颗粒分配特性及内部流动特性进行了数值模拟,系统研究了输送风、松动风及分配器倾斜角度对颗粒分配不均匀指数的影响,并进一步考察了输送风和松动风对分配器各出口气体流量分布及内部气固流动特性的影响。结果表明,增大输送风量、松动风量以及分配器的倾斜角度均可以降低颗粒分配不均匀指数,但改变松动风量的效果不如改变输送风量和倾斜角度显著。分配器倾斜角存在一个最优值时,颗粒分配均匀性最佳。输送风的增大会使得颗粒出料量最高的排料口的位置逐渐向分配器的末端移动,中间排料口所流出的气体流量占比增大,末端排料口排风量占比减小。引入松动风后,各出口的颗粒排料量更加接近,同时靠近末端排料口的气体流量占比明显增大。

关键词: 管式待生剂分配器, 输送风, 松动风, CPFD模拟, 均匀性

Abstract: Simulation on particle distribution and inner hydrodynamics in the pipe FCC spent catalyst distributor was carried out by using Computational Particle Fluid Dynamics (CPFD) method. The effects of flowrates of transport and fluidizing gases, distributor tilt angle on the heterogeneity index of particle distribution were studied, as well as the effects of flowrates of transport and fluidizing gases on the distribution of gas flow from the outlets and the inner twophase hydrodynamics. The results show that the heterogeneity index of particle distribution can be reduced by increasing the flowrates of transport and fluidizing gases, and the distributor tilt angle, in which the fluidizing gas has less impact than the transport air and distributor tilt angle. There is an optimized tilt angle at which the heterogeneity index reaches a minimum. With increasing of flowrate of transport air, the exit position with the highest particle flux gradually moves towards the end of the distributor, the fraction of gas flow from the middle exits increases, and the fraction of gas flow from the end exits decreases. After introducing fluidizing gas, the differences of solids fluxes at all outlets become smaller, and more gas flow from the outlets near the end of distributor.

Key words: pipe spent catalyst distributor, transport air, fluidizing gas, CPFD simulation, uniformity