TY - JOUR
T1 - Revisiting a large-scale FCC riser reactor with a particle-scale model
AU - Du, Yupeng
AU - Chen, Xiaoping
AU - Li, Shuo
AU - Berrouk, Abdallah Sofiane
AU - Ren, Wanzhong
AU - Yang, Chaohe
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (21908186), the China Postdoctoral Science Foundation (2020M681979), the Fundamental Research Funds for the Central Universities and the Opening Fund of State Key Laboratory of Heavy Oil Processing (SKLOP202003002) and the Natural Science Foundation of Shandong Province (ZR2017LB022).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/2/15
Y1 - 2022/2/15
N2 - Understanding gas–solid hydrodynamics, heat and mass transfer, and multiphase reactions is of great importance to the design of a large-scale fluid catalytic cracking (FCC) riser reactor. FCC catalyst particles in a large-scale (e.g., demo-scale or industrial-scale) riser reactor are generally simulated using Eulerian methods since Lagrangian approaches are often avoided because of their high computational cost. As a result, information about the flow at the particle scale is not considered. In this study, the catalyst behaviors in a large-scale FCC riser reactor are investigated with a particle-scale model that is based on the multiphase particle-in-cell (MP-PIC) scheme. Cracking reactions are taken into account through the incorporation of an eight-lump kinetic model. Numerical predictions are found to be in very close agreement with the available plant data. Detailed particle-scale information, including the particle trajectory, residence time (i.e., internal age), and coke content of the catalysts in the large-scale riser reactor, are fully quantified. Catalyst particles may be entrapped in the diameter-enlarged section, leading to high mean residence time (i.e., 1.67 s) and coke content (more than 3.0% of 3.20% catalyst particles therein), and thereby low catalytic activities (e.g., 0.77 at the height of 2.0 m). It is believed that these findings should help better understand the particle-scale physical and chemical phenomena in large-scale FCC multi-regime riser reactors and assist the design, scale-up, and optimization of similar industrial devices.
AB - Understanding gas–solid hydrodynamics, heat and mass transfer, and multiphase reactions is of great importance to the design of a large-scale fluid catalytic cracking (FCC) riser reactor. FCC catalyst particles in a large-scale (e.g., demo-scale or industrial-scale) riser reactor are generally simulated using Eulerian methods since Lagrangian approaches are often avoided because of their high computational cost. As a result, information about the flow at the particle scale is not considered. In this study, the catalyst behaviors in a large-scale FCC riser reactor are investigated with a particle-scale model that is based on the multiphase particle-in-cell (MP-PIC) scheme. Cracking reactions are taken into account through the incorporation of an eight-lump kinetic model. Numerical predictions are found to be in very close agreement with the available plant data. Detailed particle-scale information, including the particle trajectory, residence time (i.e., internal age), and coke content of the catalysts in the large-scale riser reactor, are fully quantified. Catalyst particles may be entrapped in the diameter-enlarged section, leading to high mean residence time (i.e., 1.67 s) and coke content (more than 3.0% of 3.20% catalyst particles therein), and thereby low catalytic activities (e.g., 0.77 at the height of 2.0 m). It is believed that these findings should help better understand the particle-scale physical and chemical phenomena in large-scale FCC multi-regime riser reactors and assist the design, scale-up, and optimization of similar industrial devices.
KW - Catalyst behaviors
KW - Fluid catalytic cracking (FCC)
KW - Large-scale riser reactor
KW - Multi-regime
KW - Multiphase particle-in-cell (MP-PIC)
KW - Particle-scale model
UR - http://www.scopus.com/inward/record.url?scp=85120344376&partnerID=8YFLogxK
U2 - 10.1016/j.ces.2021.117300
DO - 10.1016/j.ces.2021.117300
M3 - Article
AN - SCOPUS:85120344376
SN - 0009-2509
VL - 249
JO - Chemical Engineering Science
JF - Chemical Engineering Science
M1 - 117300
ER -