CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed

doi:10.1016/j.cjche.2024.10.020

中国化学工程学报 ›› 2025, Vol. 78 ›› Issue (2): 205-217.DOI: 10.1016/j.cjche.2024.10.020

CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed

Yin Zhang¹, Shuai Yan², Zihong Xia¹, Caixia Chen¹, Xuan Qu³, Jicheng Bi³

1. Department of Energy and Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, China;
3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

收稿日期:2024-08-14 修回日期:2024-09-25 接受日期:2024-10-09 出版日期:2025-02-08 发布日期:2024-12-05
通讯作者: Zihong Xia,E-mail:zihxia@ecust.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (22308170).

CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed

Yin Zhang¹, Shuai Yan², Zihong Xia¹, Caixia Chen¹, Xuan Qu³, Jicheng Bi³

1. Department of Energy and Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo 315211, China;
3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Received:2024-08-14 Revised:2024-09-25 Accepted:2024-10-09 Online:2025-02-08 Published:2024-12-05
Supported by:
This work is supported by the National Natural Science Foundation of China (22308170).

摘要/Abstract

摘要： Temperature is a critical factor influencing the performance of coal catalytic hydrogasification in bubbling fluidized bed gasifiers. Numerical simulations at various temperatures (1023 K, 1073 K, 1123 K, and 1173 K) are conducted to elucidate the mechanisms by which temperature affects bubble size, global reaction performance, and particle-scale reactivity. The simulation results indicate that bubble size increases at elevated temperatures, while H₂-char hydrogasification reactivity is enhanced. Particle trajectory analyses reveal that particles sized between 100 and 250 μm undergo intense char hydrogasification in the dense phase, contributing to the formation of hot spots. To assess the impact of temperature on the particle-scale flow-transfer-reaction process, the dimensionless quantities of Reynolds, Nusselt, and Sherwood numbers, along with the solids dispersion coefficient, are calculated. It is found that higher temperatures inhibit bubble-induced mass and heat transfer. In general, 3 MPa, 1123 K, and 3–4 fluidization numbers are identified as the optimal conditions for particles ranging from 0 to 350 μm. These findings provide valuable insights into the inherent interactions between temperature and gas-particle reaction.

关键词: Fluidized-bed, Gasification, Computational fluid dynamics

Abstract: Temperature is a critical factor influencing the performance of coal catalytic hydrogasification in bubbling fluidized bed gasifiers. Numerical simulations at various temperatures (1023 K, 1073 K, 1123 K, and 1173 K) are conducted to elucidate the mechanisms by which temperature affects bubble size, global reaction performance, and particle-scale reactivity. The simulation results indicate that bubble size increases at elevated temperatures, while H₂-char hydrogasification reactivity is enhanced. Particle trajectory analyses reveal that particles sized between 100 and 250 μm undergo intense char hydrogasification in the dense phase, contributing to the formation of hot spots. To assess the impact of temperature on the particle-scale flow-transfer-reaction process, the dimensionless quantities of Reynolds, Nusselt, and Sherwood numbers, along with the solids dispersion coefficient, are calculated. It is found that higher temperatures inhibit bubble-induced mass and heat transfer. In general, 3 MPa, 1123 K, and 3–4 fluidization numbers are identified as the optimal conditions for particles ranging from 0 to 350 μm. These findings provide valuable insights into the inherent interactions between temperature and gas-particle reaction.

Key words: Fluidized-bed, Gasification, Computational fluid dynamics

Yin Zhang, Shuai Yan, Zihong Xia, Caixia Chen, Xuan Qu, Jicheng Bi. CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed[J]. 中国化学工程学报, 2025, 78(2): 205-217.

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CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed

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