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

CHEN Sheng; FAN Yiping; YAN Zihan; LI Fei; WANG Wei; LU Chunxi

doi:10.11949/j.issn.0438-1157.20160401

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

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- CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser
- CIESC Journal Issue 8, Pages: 3179-3190(2016)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160401
  CLC： E624
- Online First：05 August 2016，
  
  Published：05 August 2016
- 稿件说明：
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CHEN Sheng, FAN Yiping, YAN Zihan, et al. CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser[J]. CIESC Journal, 2016, (8): 3179-3190.
DOI：

CHEN Sheng, FAN Yiping, YAN Zihan, et al. CFD simulation of novel fluidizer technology in feedstock injection zone of FCC riser[J]. CIESC Journal, 2016, (8): 3179-3190. DOI： 10.11949/j.issn.0438-1157.20160401.

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。

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.

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