Degasification of methane for high methane-emitted coal seam at Mao Khe coal mine - Vinacomin by drilling long borehole

  • Affiliations:

    1 Mao Khe Coal Company - Vinacomin, Quang Ninh, Vietnam
    2 Hanoi University of Mining and Geology, Hanoi, Vietnam

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  • Received: 29th-July-2021
  • Revised: 2nd-Nov-2021
  • Accepted: 30th-Nov-2021
  • Online: 31st-Dec-2021
Pages: 58 - 63
Views: 6030
Downloads: 1447
Rating: 5.0, Total rating: 144
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Abstract:

This paper presents a technical solution for reducing methane gas concentration (degasification) caused by a high methane-emitted coal seam at Mao Khe coal mine - Vinacomin. The technique is implemented by drilling a long borehole from the footwall of the roadway into the coal seam and punching small holes along the borehole for gas release. A field study at the longwall level -150/-80 m at Seam 9 of Mao Khe coal mine shows that after the degasification, the gas concentration here is lowered to safety standards. The technique can be used for all coal seams ranked as Class II, Class III, and super-class regarding methane gas, minimizing the risk of methane combustion and explosion.

How to Cite
Pham, D.Van, Le, D.Tien and Do, S.Anh 2021. Degasification of methane for high methane-emitted coal seam at Mao Khe coal mine - Vinacomin by drilling long borehole. Journal of Mining and Earth Sciences. 62, 6 (Dec, 2021), 58-63. DOI:https://doi.org/10.46326/JMES.2021.62(6).08.
References

Center of Mining Safety - Vinacomin, (2020). Results of methane gas content and gas concentration in boreholes. Quang Ninh. 

Kundu, S., Zanganeh, J., and Moghtaderi, B., (2016). A review on understanding explosions from methane–air mixture. Journal of Loss Prevention in the Process Industries, 40, 507-523. https://doi.org/10.1016/j.jlp.2016.02.004. 

Le, T. T., Nguyen, M. P., Do, M. H., and Hoang, Q. H., (2021). Study on classification of mines according to the level of danger of methane gas in underground coal mines in Quang Ninh region. Mining Technology Bulletin(3), 43-51.

Mao Khe Coal Company, (2020). Initiative for last 6 months of the year 2020. Quang Ninh.

Thanhnien, (2014). Coal combustion in Quang Ninh may be caused by methane gas. Retrieved from https://thanhnien.vn/thoi-su/chay-lo-than-o-quang-ninh-co-the-do-khi-metan-459937.html. 

Tran, X. H., Le, V. T., Dao, V. C., Nguyen, H. C., Le, T. P., Phan, Q. V., . . . Phung, Q. H., (2019). Mine Ventilation Manual - Underground Traffics and Fans. Hanoi: Construction Publishing House.

Vietnam Government Portal, (2008). Methane explosion incident at Khe Cham coal mine, Quang Ninh. Retrieved from http://baochinhphu.vn/Tin-noi-bat/Su-co-no-khi-metan-tai-mo-than-Khe-Cham-Quang-Ninh/19998.vgp.

Vietnam Ministry of Industry. (1999). DIRECTIVE: On strengthening technical safety management in coal mines and other minerals. Retrieved from http://vbpl.vn/TW/Pages/vbpq-toanvan.aspx?ItemID=7256. 

Vietnam Ministry of Industry and Trade, (2011). National technical regulations for safety in underground coal mining. Retrieved from http://vanban.chinhphu.vn/portal/page/portal/chinhphu/hethongvanban?class_id=1and_page=57andmode=detailanddocument_id=99378.

Vietnam Ministry of Industry and Trade, (2011-2020). Decisions on mine classification according to methane gas. Hanoi. Retrieved from https://thuvienphapluat.vn/van-ban/tai-nguyen-moi-truong/quyet-dinh-983-qd-bct-xep-loai-mo-theo-khi-metan-135717.aspx?v=d. 

Vietnam Ministry of Industry and Trade, (2021). Rank of mines according to methane gas for Vinacomin underground coal mines.

Vinacomin, (2016). Prevention and response to methane explosion hazards: Things to "pocket". Retrieved from http://www.vinacomin.vn/tho-mo-ngay-nay/phong-ung-pho-voi-hiem-hoa-chay-no-khi-me-tan-nhung-dieu-phai-bo-tui-20161226105257382.htm. 

VnExpress, (2002). Gas explosion in underground kills five people. Retrieved from https://vnexpress.net/no-khi-ham-lo-lam-5-nguoi-chet-1962690.html. 

VnExpress. (2006). Methane explosion, 8 workers died. Retrieved from https://vnexpress.net/no-khi-metan-8-cong-nhan-thiet-mang-2064612.html.