文献类型：期刊文献

英文题名：CFD investigation in the temperature effect on coal catalytic hydrogasification in the pressurized bubbling fluidized bed

作者：Zhang, Yin[1];Yan, Shuai[2];Xia, Zihong[1];Chen, Caixia[1];Qu, Xuan[3];Bi, Jicheng[3]

机构：[1]East China Univ Sci & Technol, Dept Energy Chem Engn, Shanghai 200237, Peoples R China;[2]Ningbo Univ Technol, Sch Mat & Chem Engn, Ningbo 315211, Peoples R China;[3]Chinese Acad Sci, State Key Lab Coal Convers, Inst Coal Chem, Taiyuan 030001, Peoples R China

年份：2025

卷号：78

起止页码：205

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20250517802757);WOS:【SCI-EXPANDED(收录号:WOS:001608070200001)】；

基金：This work is supported by the National Natural Science Foun-dation of China (22308170) .

语种：英文

外文关键词：Fluidized-bed; Gasification; Computational fluid dynamics

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 mm 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 mm. These findings provide valuable insights into the inherent interactions between temperature and gas-particle reaction. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.