催化裂化提升管进料区新型助流剂技术的CFD模拟

doi:10.11949/j.issn.0438-1157.20160401

化工学报 ›› 2016, Vol. 67 ›› Issue (8): 3179-3190.DOI: 10.11949/j.issn.0438-1157.20160401

催化裂化提升管进料区新型助流剂技术的CFD模拟

陈昇^1,2, 范怡平¹, 闫子涵¹, 李飞², 王维², 卢春喜¹

1 中国石油大学(北京)重质油国家重点实验室, 北京 102249;
2 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

收稿日期:2016-03-31 修回日期:2016-06-09 出版日期:2016-08-05 发布日期:2016-08-05
通讯作者: 卢春喜, 王维
基金资助:
国家重点基础研究发展计划项目(2012CB215000)。

CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser

CHEN Sheng^1,2, FAN Yiping¹, YAN Zihan¹, LI Fei², WANG Wei², LU Chunxi¹

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
2 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, CAS, Beijing 100190, China

Received:2016-03-31 Revised:2016-06-09 Online:2016-08-05 Published:2016-08-05
Supported by:
supported by the National Basic Research Program of China (2012CB215000).

摘要/Abstract

摘要：

为改善提升管进料区气固两相混合状况、消除二次流对近壁面处返混的影响，提出了一种新型助流剂技术。该技术在边壁处形成一层助流剂“保护层”，可阻止进料射流与催化剂在边壁处过长接触。通过三维CFD模拟对比了3种助流方式（逆流式、顺流式、交叉式）对传统进料区催化剂与进料混合和边壁返混的改进效果，并对最佳方式下助流剂量做进一步的优化。结果表明，逆流式助流方式最理想，交叉式助流方式最差。合适的逆流式助流方式（如助流剂注入量为进料相总流率的15%时）可改善进料区催化剂与进料相混合，抑制二次流扩张，明显减弱近边壁处（|r/R|>0.9）返混强度。

关键词: 提升管, 进料区, 二次流, 助流剂, 流化催化裂化, 能量最小多尺度模型, 计算流体力学

Abstract:

To improve the gas-solid two-phase mixing and eliminate the effect of secondary flow on the back-mixing near the riser wall in the feedstock injection zone, a novel fluidizer technology is proposed. A protective layer is produced by fluidizer to prevent long-duration contact between catalysts and feed near the wall. Three schemes for this technology (reverse-impact, concurrent-flow and crossed schemes) are used to improve the catalyst-feed mixing and back-mixing near wall by using 3-D CFD simulation. The amount of fluidizer of the optimal scheme is further optimized. The results show that the best is the reverse-impact scheme and the worst is the crossed scheme. The optimal reverse-impact scheme(when the mass flux of fluidizer is equal to the 15% mass flux of feed) can improve the catalyst-feed mixing, prevent the expanding of secondary flow and weaken the intensity of back-mixing at the |r/R|>0.9 near the wall.

Key words: riser, feed injection zone, secondary flow, fluidizer, fluid catalytic cracking, EMMS, CFD

中图分类号:

TE624

陈昇, 范怡平, 闫子涵, 李飞, 王维, 卢春喜. 催化裂化提升管进料区新型助流剂技术的CFD模拟[J]. 化工学报, 2016, 67(8): 3179-3190.

CHEN Sheng, FAN Yiping, YAN Zihan, LI Fei, WANG Wei, LU Chunxi. CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser[J]. CIESC Journal, 2016, 67(8): 3179-3190.

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催化裂化提升管进料区新型助流剂技术的CFD模拟

CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser

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