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RFCC沉降器内流动及传热过程的数值模拟 预览

Numerical simulation of flow and heat transfer in RFCC disengager
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摘要 针对重油催化裂化(RFCC)沉降器结焦问题,采用计算流体力学方法,建立了一套160万吨/年工业重油催化裂化(RFCC)沉降器油气流动和传热的数学模型。通过模拟研究考察了沉降器内的速度、温度以及油气分压分布,结果表明,油气运动速度低、分压大易导致结焦。通过计算粗旋、顶旋以及汽提段等各部分油气在沉降器内的停留时间分布发现,粗旋料腿处进入沉降器的油气含量高且停留时间很长,对沉降器结焦的影响最大,因此降低粗旋料腿处进入沉降器内的油气量是防结焦的关键。 A flow and heat transfer model of oil-gas in a 1.60 Mt/a RFCC disengager was established using computational fluid dynamics (CFD) to solve coking problems of resid fluid catalytic cracking (RFCC) disengager. The distribution of oil-gas velocity, temperature and partial pressure were investigated. The results show that low velocity and high partial pressure of oil-gas is an important reason for disengager coking. Meanwhile, residence time distribution of oil-gas from the primary cyclone standpipe, the primary cyclone dipleg, the secondary cyclone dipleg and the stripper inlet were calculated. The results reveal that coking in disengager is mainly caused by oil-gas from the primary cyclone dipleg due to its big volume and long residence time. Therefore, decrease of oil-gas in the primary cyclone dipleg is the key to eliminate disengager coking.
作者 刘英杰 卢春喜 LIU Ying-jie;LU Chun-xi(Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,Changzhou University,Changzhou 116024,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum (Beijing),Beijing 102249,China)
出处 《高校化学工程学报》 EI CAS CSCD 北大核心 2019年第2期315-320,共6页 Journal of Chemical Engineering of Chinese Universities
基金 江苏省绿色催化材料与技术实验室开放课题基金(BM2012110) 重质油国家重点实验室开放课题基金(SKLOP20163001)。
关键词 重油催化裂化 沉降器 结焦 停留时间分布 计算流体力学 resid fluid catalytic cracking disengager coking residence time distribution CFD
作者简介 刘英杰(1982-),女,山东威海人,常州大学讲师,博士;通讯联系人:卢春喜,E-mail:lcx725@sina.com.
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