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

doi:10.11949/j.issn.0438-1157.20171016

Abstract

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.

Key words: FCC, riser reactor, feed injection zone, multi-phase flow, mixing, flow, optimization

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。

关键词: 催化裂化, 提升管反应器, 进料段, 多相流, 混合, 流动, 优化

CLC Number:

TQ016

FAN Yiping, LU Chunxi. Multiphase flow characteristics and structural optimization in feed injection zone of FCC riser[J]. CIESC Journal, 2018, 69(1): 249-258.

范怡平, 卢春喜. 催化裂化提升管进料段内多相流动及其结构优化[J]. 化工学报, 2018, 69(1): 249-258.

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