Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser

FAN Yiping; LU Chunxi

doi:10.11949/j.issn.0438-1157.20171016

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Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser

更新时间：2025-12-10

- Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser
- CIESC Journal Issue 1, Pages: 249-258(2018)
- 作者机构：
  
  中国石油大学(北京)重质油国家重点实验室,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171016
  CLC： Q016
- Online First：05 January 2018，
  
  Published：05 January 2018
- 稿件说明：
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FAN Yiping, LU Chunxi. Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser[J]. CIESC Journal, 2018, (1): 249-258.
DOI：

FAN Yiping, LU Chunxi. Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser[J]. CIESC Journal, 2018, (1): 249-258. DOI： 10.11949/j.issn.0438-1157.20171016.

摘要

催化裂化提升管进料段内油、剂两相的流动-混合状况对目标产品的收率具有重要的影响。早期研究多属于“探索性”的结构优化。近年来，通过大型冷模实验，结合理论分析和数值模拟，发现在传统结构进料段中，对油、剂混合流场起重要作用的是Kutta-Joukowski横向力引起的原料射流“二次流”。对二次流“用其利、抑其弊”是优化传统结构进料段的关键，目前已取得广泛的工业应用。而近期Kutta-Joukowski横向力分析以及冷模实验、数值模拟的结果表明，油剂逆流接触新型进料段可更有效地促进油剂混合，使两相接触更为均匀；较传统形式进料段结构具有更明显的优势。

Abstract

The flow/mixing condition of feed oil and catalysts in the feed injection zone of FCC riser plays a crucial role in the yield of the desired products. The early relative researches were essentially tentative optimization works. In recent years

large cold model experimental research

theoretical analysis and CFD simulation were widely carried out. It was found that the feed jet secondary flow

which is generated by a Kutta-Joukowski transverse force

contributes considerably to the mixing and flow in the traditional feed injection zone. Therefore

effectively controlling and utilizing the secondary flow is the key factor to optimize the traditional feed injection scheme. The proposed improved scheme has been widely used in commercial units. In the past six years

the downward pointed feed injection scheme has been proved to be a more desired structure by the Kutta-Joukowski transverse force analysis

cold model experiment and CFD simulation. It was shown that the mixing of feed oil and catalysts was intensified while the contacting of two-phase presented more uniform. In other words

the downward pointed feed injection scheme exhibited more obvious advantages comparing with the traditional.

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