文献类型：期刊文献

英文题名：Thermal behaviors of coal particles in an impinging entrained-flow gasifier: Char oxidation

作者：Wang, Yue[1];Gong, Yan[1];Lu, Hantao[1];Guo, Qinghua[1];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

年份：2024

卷号：267

外文期刊名：COMBUSTION AND FLAME

收录：;EI(收录号：20242616531210);WOS:【SCI-EXPANDED(收录号:WOS:001261809500001)】；

基金：This work has been supported by the National Natural Science Foundation of China (U21A20318) , National Key R & D Program of China (2022YFB4101500) , and Shanghai Rising -Star Program (21QA1402300) .

语种：英文

外文关键词：Entrained-flow gasification; In -situ visualization; Particle trajectories; Particle temperature; Char oxidation

摘要：The thermal behaviors of high-temperature particle (HTP) and low-temperature particle (LTP) are investigated based on the bench-scale impinging entrained-flow coal-water slurry (CWS) gasification experimental platform with a modified visualization system. The size and velocity distribution of both particles, and the evolution of HTP are analyzed through the algorithmic and precise processing of the image sequences. In addition, in-situ temperature diagnosis of the particles during the reaction process were realized. The typical evolution process and the temperature of HTP in char oxidation stage are obtained. The results show that the concentration of HTP in the gasifier is greater than LTP, but the particle size is relatively small. Particles moving at the low speed (0-2 m/s) account for the largest proportion of both HTP and LTP. The char oxidation process lasts over 300 ms and can be divided into three reaction stages. During the reaction, the peak temperature at the center of the particle can reach more than 2000 K. The average temperature of the particles gradually increased, reaching a peak in reaction stage II (1500 K) followed by a gradual decrease. The particle temperature is affected by O/C and is prone to experience swelling and bubbling phenomena during char oxidation.