CFD investigation of effects of feedstock oil vaporization on FCC cracking reaction and coking

doi:10.11949/0438-1157.20211720

CIESC Journal ›› 2022, Vol. 73 ›› Issue (7): 2982-2995.DOI: 10.11949/0438-1157.20211720

• Catalysis, kinetics and reactors • Previous Articles Next Articles

CFD investigation of effects of feedstock oil vaporization on FCC cracking reaction and coking

Sheng CHEN¹(),Mengke WANG^1,²(),Bona LU^3,⁴,Xiufeng LI¹,Cenfan LIU¹,Mengxi LIU²(),Yiping FAN²,Chunxi LU²

^1.Technological Innovation Center of Risk Prevention and Control for Refining and Chemical Equipment, China Special Equipment Inspection and Research Institute, Beijing 100029, China
^2.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
^3.State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
^4.School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 101408, China

Received:2021-12-02 Revised:2022-03-29 Online:2022-08-01 Published:2022-07-05
Contact: Sheng CHEN,Mengxi LIU

原料油汽化特性对催化裂化反应结焦过程影响的CFD模拟

陈昇¹(),王梦钶^1,²(),鲁波娜^3,⁴,李秀峰¹,刘岑凡¹,刘梦溪²(),范怡平²,卢春喜²

^1.中国特种设备检测研究院，炼油与化工装备风险防控国家市场监管技术创新中心，北京 100029
^2.中国石油大学（北京）重质油国家重点实验室，北京 102249
^3.中国科学院过程工程研究所多相复杂系统国家重点实验室，北京 100190
^4.中国科学院大学化工学院，北京 101408

通讯作者: 陈昇,刘梦溪
作者简介:陈昇（1987—），男, 博士,高工，chen_sheng1987@sina.com|王梦钶（1997—），女，硕士研究生，15737814797@163.com
基金资助:
国家市场监督管理总局科技计划项目(2019MK132);国家自然科学基金项目(21808245);中国特种设备检测研究院二级学科建设项目(2021XKTD004)

Abstract

Abstract:

To investigate the influence of feedstock oil vaporization characteristics, a multi-phase Eulerian model coupling with the models of EMMS drag and mass transfer, oil droplet vaporization and twelve lumped reaction kinetics were used to simulate a million ton scale industrial FCC riser for predicting complex three-phase flow, reaction and coking behaviors. A coking model was proposed to predict the coking extent. The distribution of concentration and temperature of each phase, reaction component and coking extent were investigated under different droplet sizes of atomized feedstock oil and initial vaporization temperatures. The results show that the simulation can well predict the vaporization, reaction coking and fixed coking. The atomized droplet size and initial vaporization temperature affect the oil droplet vaporization rate and cracking reaction conversion rate through the interphase momentum transfer and vaporization speed. Appropriate droplet size (60 μm) and initial vaporization temperature (654 K) can improve the yield of light oil, gasoline and liquefied petroleum gas and alleviate the degree of coking.

Key words: fluid catalytic cracking, multiphase reaction, vaporization, coking, computational fluid dynamics

摘要：

为考察原料油汽化特性影响，在一套百万吨级工业FCC提升管中，基于多相欧拉模型耦合EMMS曳力和传质、油滴汽化和十二集总反应动力学模型，采用三维CFD模拟研究气液固三相流动、汽化、反应、结焦的复杂过程，新开发结焦预测模型定量预测结焦状况，对比研究不同原料油雾化液滴粒径和起始汽化温度下各相和反应组分浓度场、温度场分布和结焦程度。结果表明，模拟方法可较准确预测汽化、反应生焦和结焦过程，不同雾化液滴粒径和起始汽化温度通过流场分布和汽化快慢影响液相油滴汽化率和反应转化率；合适液滴粒径(60 μm)和起始汽化温度(654 K)可提升轻油、汽油、液化石油气目标产品收率并改善结焦程度。

关键词: 催化裂化, 多相反应, 汽化, 结焦, CFD

CLC Number:

TE 624

Sheng CHEN, Mengke WANG, Bona LU, Xiufeng LI, Cenfan LIU, Mengxi LIU, Yiping FAN, Chunxi LU. CFD investigation of effects of feedstock oil vaporization on FCC cracking reaction and coking[J]. CIESC Journal, 2022, 73(7): 2982-2995.

陈昇, 王梦钶, 鲁波娜, 李秀峰, 刘岑凡, 刘梦溪, 范怡平, 卢春喜. 原料油汽化特性对催化裂化反应结焦过程影响的CFD模拟[J]. 化工学报, 2022, 73(7): 2982-2995.

Figures/Tables 1

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CFD investigation of effects of feedstock oil vaporization on FCC cracking reaction and coking

原料油汽化特性对催化裂化反应结焦过程影响的CFD模拟

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