Experimental Study of Reverse Underground Coal Gasification

Hongtao Liu, Feng Chen, Yuanyuan Wang, Gang Liu, Hong Yao and Shuqin Liu
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Hongtao Liu: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
Feng Chen: State Key Laboratory of Coal-Based Low Carbon Energy, ENN Science & Technology Development Co., Ltd., Langfang 065001, China
Yuanyuan Wang: State Key Laboratory of Coal-Based Low Carbon Energy, ENN Science & Technology Development Co., Ltd., Langfang 065001, China
Gang Liu: State Key Laboratory of Coal-Based Low Carbon Energy, ENN Science & Technology Development Co., Ltd., Langfang 065001, China
Hong Yao: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
Shuqin Liu: School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China

Energies, 2018, vol. 11, issue 11, 1-13

Abstract: Underground coal gasification (UCG) produces less pollution and is safer than traditional coal mining. In order to investigate the effects of different gasifying agents or comprehensive analyses of the characteristics of the gas components in the three zones for the reverse underground coal gasification process, a model test was carried out. The results showed that the oxygen concentration of a gasifying agent is recommended to be higher than 21%, which will lead to more combustible gases and a higher calorific value of gas. Higher flow rates and oxygen content generally afforded more desirable gas compositions and calorific values, with the latter as high as 1430.19 kcal/Nm 3 . For the enriched oxygen gasifying agent in the reverse gasification process, the flow increase from 10 to 20 Nm 3 /h affords a rapid increase in the growth rate of the flame front, from 1.80 to 4.88 m/day, which is much faster than that for the air gasifying agent. Increasing the gas injection rate and oxygen concentration will increase the growth rate of the flame front. This affects the distribution of the three zones and further leads to different characteristics of the gas components.

Keywords: underground coal gasification; reverse; gas composition; temperature field; three zones (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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