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Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions

Author

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  • Wen Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia)

  • Heng Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Huamin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Dongyin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Huaibin Li

    (School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China)

  • Zhenhua Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract

The massive emission of low concentrations (≤0.5%) of methane (CH 4 ) from ventilation roadways results in resource waste and environmental pollution. To mitigate these emissions, an enrichment tower for low-concentration methane is designed, and segregation and non-segregation experiments are conducted. The results reveal that stable concentrations of methane under segregation and non-segregation states in the enrichment tower gradually increase with height, with a maximum methane concentration of 0.64% and 0.54%, respectively. This shows that the methane enrichment effect in free diffusion conditions is more significant under the segregation state than under the non-segregation state. The stable concentration of methane in the middle and upper sections of the enrichment tower shows an increasing trend. However, the stable concentration of methane in the lower section of the enrichment tower has an increasing trend (less than 0.50%). According to the methane molecule Boltzmann distribution law, methane concentration enrichment decreases with height, and the conversion of the methane from the segregated to non-segregated is irreversible. Consequently, industrial applications of methane enrichment from buoyant forces are not feasible for low concentrations of methane.

Suggested Citation

  • Wen Wang & Heng Wang & Huamin Li & Dongyin Li & Huaibin Li & Zhenhua Li, 2018. "Experimental Enrichment of Low-Concentration Ventilation Air Methane in Free Diffusion Conditions," Energies, MDPI, vol. 11(2), pages 1-11, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:428-:d:131722
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    References listed on IDEAS

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    1. Uddin, Noim & Blommerde, Mascha & Taplin, Ros & Laurence, David, 2015. "Sustainable development outcomes of coal mine methane clean development mechanism Projects in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 1-9.
    2. George Dalianis & Evanthia Nanaki & George Xydis & Efthimios Zervas, 2016. "New Aspects to Greenhouse Gas Mitigation Policies for Low Carbon Cities," Energies, MDPI, vol. 9(3), pages 1-16, February.
    3. Karakurt, Izzet & Aydin, Gokhan & Aydiner, Kerim, 2011. "Mine ventilation air methane as a sustainable energy source," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(2), pages 1042-1049, February.
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    Cited by:

    1. Bo Lan & You-Rong Li & Xu-Sheng Zhao & Jian-Dong Kang, 2018. "Industrial-Scale Experimental Study on the Thermal Oxidation of Ventilation Air Methane and the Heat Recovery in a Multibed Thermal Flow-Reversal Reactor," Energies, MDPI, vol. 11(6), pages 1-13, June.
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