煤
煤炭地下气化
点火系统
煤矿开采
入口
扩散
石油工程
燃烧
环境科学
机械
采矿工程
废物管理
核工程
地质学
工程类
化学
热力学
机械工程
物理
有机化学
航空航天工程
作者
Yi Xiao,Haoyu Zhang,Guangqian Luo,Can Fang,Tianyu Zhao,Lingxuan Chen,Renjie Zou,Youjun Zhang,Juan Chen,Xian Li,Hong Yao
出处
期刊:Energy
[Elsevier]
日期:2024-02-01
卷期号:288: 129735-129735
标识
DOI:10.1016/j.energy.2023.129735
摘要
Underground coal gasification (UCG) in deep coal seam was attracting more and more attentions all over the world due to its characteristics of safety, clean and low carbon. In the study, the ignition of UCG in deep coal seam was simulated by employing computational fluid dynamics (CFD). A new method setting gas diffusion in coal seam as transitional diffusion (TD) was put forward, and the TD and Fickian diffusion (FD) mechanism were compared. It was elucidated that TD mechanism was more accurate for UCG model. The default FD mechanism in coal seam overestimated the reaction rate of coal seam. With TD mechanism, coal seam in turn went through external heating controlled (EHC) region and hybrid heating controlled (HHC) region during the ignition of UCG. The demarcation temperature between EHC and HHC regions was 720 K. Then, various inlet temperatures and mass fractions of O2 were attempted during the simulation of UCG ignition. The time spent by the ignition was shortest with 1100 K inlet temperature and it was ∼180 s. The less the inlet mass fraction of O2 was used, the slower combustion rate was. CO2 was the most potential indicator to get access to the underground condition.
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