期刊
POWDER TECHNOLOGY
卷 398, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.powtec.2022.117137
关键词
Fluid catalytic cracking; Diameter-transformed fluidized bed; Choking; CFD; Reaction; EMMS
资金
- National Natural Science Foundation of China [22078331, 91834302, 21625605]
- Transformational Technologies for Clean Engery and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21030700]
- National Science and Technology Major Project [2017-I-0004-0005]
This study investigates the flow regime transition and regulation mechanism in diameter-transformed reactors using multiscale CFD simulations and twelve-lump kinetics. The results show that a high-concentration choking plateau appears in the new reactor when considering reactions, while it becomes a slowly ascending slope under cold-model conditions. Changing the particle circulating mode can stabilize the flow behaviors and product yield.
The maximizing isoparaffins (MIP) reactor has multiple reaction zones by expanding the diameter of the middle section of the conventional equal-diameter FCC riser to produce high-quality gasoline. This study aimed to probe the flow regime transition and corresponding regulation of such diameter-transformed reactors using multiscale CFD simulations with twelve-lump kinetics. It was found that a choking plateau that appears in a low-velocity, equal-diameter riser was captured at a much higher solid concentration in the new reactor when considering reactions, while the plateau disappears and becomes a slowly ascending slope under cold-model conditions. Using the particle circulating mode instead of the fixed mode gives rise to large fluctuations in solids flow and reaction rate in the first zone, but the formation of fast fluidization in the expanded second zone can help stabilize the flow behaviors and product yield. This finding sheds light on the design and operation of diameter-transformed fluidized beds. (C) 2022 Elsevier B.V. All rights reserved.
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