Numazawa Yui, Hara Yuki, Matsukawa Yoshiya, Matsushita Yohsuke, Aoki Hideyuki, Shishido Takahiro, Okuyama Noriyuki
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
Kobe Steel, Ltd., 2-3-1, Shinhama, Arima-cho, Takasago, Hyogo 676-8670, Japan.
ACS Omega. 2021 Apr 22;6(17):11436-11446. doi: 10.1021/acsomega.1c00443. eCollection 2021 May 4.
A distributed activation energy model (DAEM) was applied to the kinetic analysis of CO and HO gasification reactions for pulverized metallurgical coke. The results of the scanning electron microscopy observations and CO gas adsorption suggested that the gasification reaction occurs at the particle surface. Therefore, a grain model was employed as a gasification reaction model. The reaction rates of CO and HO gasification were evaluated based on the DAEM. The activation energy changed as the reaction progressed and hardly depended on the particle size. The activation energies were 200-260 kJ/mol in CO gasification and 220-290 kJ/mol in HO gasification. The frequency factor of HO gasification was approximately 10 times larger than that of CO gasification, regardless of the progress of the reaction. At the same activation energy level, the frequency factor showed a higher value with a decrease in the particle size. This result was consistent with the theory of the grain model and indicated that the gasification reaction of the pulverized coke with a micrometer scale occurs on the surface of the coke particle. Furthermore, the value predicted by the DAEM was in good agreement with the experimental one.
采用分布式活化能模型（DAEM）对粉磨冶金焦的CO和H₂O气化反应进行动力学分析。扫描电子显微镜观察结果和CO气体吸附表明，气化反应发生在颗粒表面。因此，采用颗粒模型作为气化反应模型。基于DAEM评估了CO和H₂O气化的反应速率。活化能随反应进行而变化，且几乎不依赖于颗粒尺寸。CO气化的活化能为200 - 260 kJ/mol，H₂O气化的活化能为220 - 290 kJ/mol。无论反应进程如何，H₂O气化的频率因子约比CO气化的大10倍。在相同活化能水平下，频率因子随颗粒尺寸减小而呈现更高的值。该结果与颗粒模型理论一致，表明微米级粉磨焦炭的气化反应发生在焦炭颗粒表面。此外，DAEM预测值与实验值吻合良好。
