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Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems

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  • Faqiang Su

    (Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Takuya Nakanowataru

    (Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Ken-ichi Itakura

    (Graduate School of Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran 050-8585, Japan)

  • Koutarou Ohga

    (Graduate School of Engineering, Hokkaido University, Kita-ku, Sapporo 060-8628, Japan)

  • Gota Deguchi

    (Underground Resources Innovation Network, NPO, Higashi-ku, Sapporo 007-0847, Japan)

Abstract

In the underground coal gasification (UCG) process, cavity growth with crack extension inside the coal seam is an important phenomenon that directly influences gasification efficiency. An efficient and environmentally friendly UCG system also relies upon the precise control and evaluation of the gasification zone. This paper presents details of laboratory studies undertaken to evaluate structural changes that occur inside the coal under thermal stress and to evaluate underground coal-oxygen gasification simulated in an ex-situ reactor. The effects of feed temperature, the direction of the stratified plane, and the inherent microcracks on the coal fracture and crack extension were investigated using some heating experiments performed using plate-shaped and cylindrical coal specimens. To monitor the failure process and to measure the microcrack distribution inside the coal specimen before and after heating, acoustic emission (AE) analysis and X-ray CT were applied. We also introduce a laboratory-scale UCG model experiment conducted with set design and operating parameters. The temperature profiles, AE activities, product gas concentration as well as the gasifier weight lossess were measured successively during gasification. The product gas mainly comprised combustible components such as CO, CH 4 , and H 2 (27.5, 5.5, and 17.2 vol% respectively), which produced a high average calorific value (9.1 MJ/m 3 ).

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:5:p:2386-2406:d:25468
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    References listed on IDEAS

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    1. 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.
    2. Blinderman, M.S. & Saulov, D.N. & Klimenko, A.Y., 2008. "Forward and reverse combustion linking in underground coal gasification," Energy, Elsevier, vol. 33(3), pages 446-454.
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    Cited by:

    1. Zenon Pilecki & Robert Hildebrandt & Krzysztof Krawiec & Elżbieta Pilecka & Zbigniew Lubosik & Tomasz Łątka, 2023. "Assessment of Combustion Cavern Geometry in Underground Coal Gasification Process with the Use of Borehole Ground-Penetrating Radar," Energies, MDPI, vol. 16(18), pages 1-14, September.
    2. Fa-qiang Su & Akihiro Hamanaka & Ken-ichi Itakura & Gota Deguchi & Wenyan Zhang & Hua Nan, 2018. "Evaluation of a Compact Coaxial Underground Coal Gasification System Inside an Artificial Coal Seam," Energies, MDPI, vol. 11(4), pages 1-11, April.
    3. Christopher Otto & Thomas Kempka, 2015. "Thermo-Mechanical Simulations of Rock Behavior in Underground Coal Gasification Show Negligible Impact of Temperature-Dependent Parameters on Permeability Changes," Energies, MDPI, vol. 8(6), pages 1-28, June.
    4. Md M. Khan & Joseph P. Mmbaga & Ahad S. Shirazi & Japan Trivedi & Qingzia Liu & Rajender Gupta, 2015. "Modelling Underground Coal Gasification—A Review," Energies, MDPI, vol. 8(11), pages 1-66, November.
    5. 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.
    6. 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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