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Experimental Study of Reverse Underground Coal Gasification

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  • Hongtao Liu

    (State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
    State Key Laboratory of Coal-Based Low Carbon Energy, ENN Science & Technology Development Co., Ltd., Langfang 065001, 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)

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.

Suggested Citation

  • Hongtao Liu & Feng Chen & Yuanyuan Wang & Gang Liu & Hong Yao & Shuqin Liu, 2018. "Experimental Study of Reverse Underground Coal Gasification," Energies, MDPI, vol. 11(11), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:2949-:d:178987
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    References listed on IDEAS

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    Cited by:

    1. Ján Kačur & Marek Laciak & Milan Durdán & Patrik Flegner, 2023. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research," Energies, MDPI, vol. 16(17), pages 1-55, August.
    2. Feng, Lele & Zhou, Sibo & Xu, Xiangcen & Qin, Botao, 2022. "Importance evaluation for influencing factors of underground coal gasification through ex-situ experiment and analytic hierarchy process," Energy, Elsevier, vol. 261(PA).
    3. Oleg Bazaluk & Vasyl Lozynskyi & Volodymyr Falshtynskyi & Pavlo Saik & Roman Dychkovskyi & Edgar Cabana, 2021. "Experimental Studies of the Effect of Design and Technological Solutions on the Intensification of an Underground Coal Gasification Process," Energies, MDPI, vol. 14(14), pages 1-18, July.
    4. Dong, Maifan & Feng, Lele & Qin, Botao & Pang, Jiabao & Han, Gang & Xie, Jiahao, 2024. "A novel gas injection method with swirl flow in underground gasification for improving gas production and controlling pollution yields," Energy, Elsevier, vol. 297(C).

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