煤炭地下气化
煤矿开采
煤
固碳
环境科学
石油工程
采矿工程
洁净煤
二氧化碳
废物管理
地质学
工程类
化学
有机化学
作者
Liangliang Jiang,Shanshan Chen,Yanpeng Chen,Zhangxin Chen,Fangjin Sun,Xiaohu Dong,Keliu Wu
出处
期刊:Fuel
[Elsevier]
日期:2022-10-12
卷期号:332: 126016-126016
被引量:30
标识
DOI:10.1016/j.fuel.2022.126016
摘要
As a clean coal technology, underground coal gasification (UCG) boasts a prospect in tapping worldwide deep coal seams, with a tremendous potential to be linked with following carbon storage and sequestration. Therefore, UCG ought to play a vital role as a sustainable technological alternative in a climate-conscious world. However, the world has very limited experience in deep UCG development because most of the tests were on shallow coals. This paper aims to bridge the knowledge gap to shed light on the development of UCG cavities in deep coal seams. A large-scale 3D UCG model was constructed with an improved Controlled Retraction Injection Point (CRIP) method, which is more suitable to deep UCG. In addition, the effect of double-diffusive natural convection was included. Modelling results show that the improved method contributed to a favourable development of UCG cavities in deep coal seams with a good gas production. Compared to a shallow UCG, pore variations exhibited a similar pattern but with distinct characteristics owing to the effects of a high pressure. Furthermore, double-diffusive natural convection was revealed to play an important role in the development of cavities and the general UCG performance. The relevant findings will help enhance the knowledge base of UCG operations in world deep coal seams, promote the clean utilization of world coal resources, and if linked to carbon dioxide storage and sequestration, contribute to the reduction of carbon dioxide emissions in a climate-conscious world.
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