A new transient nonuniformity index for the feed injection zone of a multiphase fluidized bed reactor--颗粒学报PARTICUOLOGY

Kong, S., Cai, M., Li, J., Cheng, F., Lu, C., Liu, M., . . . Hou, K. (2025). A new transient nonuniformity index for the feed injection zone of a multiphase fluidized bed reactor. Particuology, 103, 164-175. https://doi.org/10.1016/j.partic.2025.05.002

A new transient nonuniformity index for the feed injection zone of a multiphase fluidized bed reactor

Shuangzhu Kong^a, Min Cai^b, Jian Li^a, Feng Cheng^a, Chunxi Lu^a, Mengxi Liu^{a e *}, Chaowei Liu^c, Zhifeng Wang^d, Kaijun Hou^d

a State Key Laboratory of Heavy Oil Processing, China University of Petroleum Beijing, Beijing, 102249, China
b Sinopec Engineering Incorporation, Beijing, 100101, China
c Petrochemical Research Institute, PetroChina, Beijing, 102206, China
d Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou, 730060, China
e Shandong Institute of Petroleum and Chemical Technology, Dongying, 257061, China

10.1016/j.partic.2025.05.002

Volume 103, August 2025, Pages 164-175

Received 8 April 2025, Revised 20 April 2025, Accepted 4 May 2025, Available online 24 May 2025, Version of Record 5 June 2025.

E-mail: liumx@cup.edu.cn

Highlights

• A new index TSNI is proposed to investigate transient gas-solid distribution nonuniformity of cross-sections.

• Temporal and spatial distributions of TSNI is studied to evaluate influence of jets on flow field of a feed injection zone.

• Effect of operating conditions on transient nonuniformity is investigated.

Abstract

In the feed injection zone of a multiphase fluidized bed reactor, nonuniform distribution exists due to the introduction of feed nozzle jets and circulating catalyst, which ultimately have an impact on the performance of the reactor. The transient sectional nonuniformity index (TSNI) is proposed as a new index to quantify the nonuniformity of solid distribution in both radial and circumferential dimensions at the same time, based on the transient solids holdup data in the feed zone. The temporal and spatial distributions of TSNI can more accurately reflect the changes in the real-time gas-solid distribution uniformity of the cross-sections and the efficiency of gas-solid contact in the feed injection zone. The feed injection zone can be divided into three regions according to the characteristics of TSNI: the bubble-influenced zone, the jet-influenced zone, and the acceleration zone. According to the numerical simulation results, it was analyzed that TSNI is highly correlated with operating conditions, such as nozzle gas velocity and catalyst circulation rate.

Graphical abstract

Keywords

Gas-solid fluidized bed; Nonuniformity index; Computational fluid dynamics; Feed injection zone

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