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Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Author

Listed:
  • Akihiro Hamanaka

    (Department of Earth Resources Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan)

  • Fa-qiang Su

    (School of Energy Science and Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo 454-003, Henan, China
    Center of Environmental Science and Disaster Mitigation for Advanced Research, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Ken-ichi Itakura

    (Center of Environmental Science and Disaster Mitigation for Advanced Research, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan
    Department of Information and Electronic Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Kazuhiro Takahashi

    (Center of Environmental Science and Disaster Mitigation for Advanced Research, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan
    Department of Information and Electronic Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Jun-ichi Kodama

    (Division of Sustainable Resources Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan)

  • Gota Deguchi

    (Underground Resources Innovation Network, Kita 47 Higashi 17, Higashi-ku, Sapporo 007-0847, Japan)

Abstract

Underground coal gasification (UCG) is a technique to recover coal energy without mining by converting coal into a valuable gas. Model UCG experiments on a laboratory scale were carried out under a low flow rate (6~12 L/min) and a high flow rate (15~30 L/min) with a constant oxygen concentration. During the experiments, the coal temperature was higher and the fracturing events were more active under the high flow rate. Additionally, the gasification efficiency, which means the conversion efficiency of the gasified coal to the product gas, was 71.22% in the low flow rate and 82.42% in the high flow rate. These results suggest that the energy recovery rate with the UCG process can be improved by the increase of the reaction temperature and the promotion of the gasification area.

Suggested Citation

  • Akihiro Hamanaka & Fa-qiang Su & Ken-ichi Itakura & Kazuhiro Takahashi & Jun-ichi Kodama & Gota Deguchi, 2017. "Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System," Energies, MDPI, vol. 10(2), pages 1-11, February.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:2:p:238-:d:90563
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    References listed on IDEAS

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    1. Faqiang Su & Takuya Nakanowataru & Ken-ichi Itakura & Koutarou Ohga & Gota Deguchi, 2013. "Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems," Energies, MDPI, vol. 6(5), pages 1-21, May.
    2. Khadse, Anil & Qayyumi, Mohammed & Mahajani, Sanjay & Aghalayam, Preeti, 2007. "Underground coal gasification: A new clean coal utilization technique for India," Energy, Elsevier, vol. 32(11), pages 2061-2071.
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    Cited by:

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    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. Javed, Syed Bilal & Uppal, Ali Arshad & Bhatti, Aamer Iqbal & Samar, Raza, 2019. "Prediction and parametric analysis of cavity growth for the underground coal gasification project Thar," Energy, Elsevier, vol. 172(C), pages 1277-1290.
    4. Krzemień, Alicja, 2019. "Fire risk prevention in underground coal gasification (UCG) within active mines: Temperature forecast by means of MARS models," Energy, Elsevier, vol. 170(C), pages 777-790.
    5. Xi Lin & Qingya Liu & Zhenyu Liu, 2018. "Estimation of Effective Diffusion Coefficient of O 2 in Ash Layer in Underground Coal Gasification by Thermogravimetric Apparatus," Energies, MDPI, vol. 11(2), pages 1-14, February.

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