摘要
针对近年来炼油厂中出现的催化裂化烟气轮机结垢严重问题，采用SEM（扫描电子显微镜）对催化剂平衡剂、烟机入口催化剂颗粒和垢样进行了微观形貌的分析，结果表明，烟机叶片上的结垢主要是由1～2μm的催化剂颗粒组成。对催化剂黏附在叶片表面的机理进行研究，分析黏附力对黏附作用的影响，结果表明，催化剂颗粒粒径越小，越容易被黏附，与SEM的结果吻合。通过CFD模拟烟机流道内速度场的分布，验证了黏附力对结垢的影响。
Addressing the problem of serious fouling on the blades of FCCU （fluid catalytic cracking unit） power recovery expanders in refinery, micro-morphologies of fouling and catalyst particle at inlet of power recovery expander were analyzed with scanning electron microscopy （SEM）. The fouling on the blades consisted of catalyst particle with diameter mainly between 1μm and 2μm. Then the adhesion mechanism of the catalyst particle and the effect of various adhesive forces on the adhesion phenomenon were studied. The smaller the diameter of the particle, the easier the particle was adhered, which agreed with the result of SEM. The inner distribution of the velocity field simulated by CFD demonstrated the effect of adhesive force on the fouling.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第1期79-85,共7页
CIESC Journal
基金
中国石油化工股份有限公司科技开发项目(312016)
关键词
催化裂化
烟气轮机
黏附
结垢
CFD
FCCU
power recovery expander
adhesion
fouling
CFD
