摘要
失活催化剂的气化再生过程是化工过程工业化连续运行的关键,其直接受到微观孔隙结构和焦炭分布特性的影响。本文基于格子玻尔兹曼方法,耦合相更新模型,研究了孔隙尺度上焦炭气化行为引起的孔隙结构的动态演变过程,评估了焦炭楔形分布对焦炭气化反应特性和传质特性的影响。结果表明,焦炭楔形分布条件下,气化反应导致轴向孔喉结构,且喉部不断右移。局部孔喉结构在一定程度上抑制了焦炭气化反应速率。本研究深入理解了焦炭气化行为引起的微观孔隙结构和传质特性的耦合作用,也为焦炭气化效率的提高提供了借鉴。
The gasification regeneration process of deactivated catalyst is the key to the industrial continuous operation of chemical processes,which depends on the microscopic pore structure and coke distribution properties.In this work,the dynamic evolution of pore structure caused by coke gasification on the pore scale are studied and the effects of wedge-shaped coke distributions on the coke gasification reaction characteristics and mass transfer characteristics are evaluated,based on the lattice Boltzmann method with phase update model.The results show that the gasification reaction leads to axial pore throat structure and the throat is continuously shifted to the right,for the wedge-shaped coke.The local pore-throat structure suppressed the coke gasification reaction rate to some extent.This study provides an in-depth understanding of the coupling effect of microscopic pore structure and mass transfer characteristics caused by coke gasification behavior,and also provides a reference for the improvement of coke gasification efficiency.
作者
雷依婷
张超
徐善志
刘敏
史轩
Lei Yiting;Zhang Chao;Xu Shanzhi;Liu Min;Shi Xuan(PipeChina Beijing Pipeline Co.,Ltd.,Qinhuangdao 066002,China;Offshore Oil Engineering Co.,Ltd.,Tianjin 300451,China)
出处
《山东化工》
CAS
2022年第11期55-58,共4页
Shandong Chemical Industry
关键词
气化
积碳
多孔催化颗粒
孔隙尺度模拟
gasification
coke
porous catalytic particle
pore-scale simulation
