Using high level roadway to control gas emission in a longwall mining face – numerical simulation study

• Autorzy: Ma Yongzhen , Cheng Jianwei , Zhang Rui , Wang Zui , Ran Dezhi , Sheng Shuping , Zhang Jufeng , Si Junhong , Yu Zhaoyang

Identyfikatory

DOI

10.24425/ams.2022.143683

• Języki publikacji: EN

Abstrakty

EN

With the increase of coal mining depth, the gas content in coal seams could also become larger and larger, which could suddenly cause an inrush of gas into the longwall mining face. It is very dangerous for miners’ safety in the underground. The U-shaped ventilation pattern of longwall mining face that underground coal mines currently use is not enough to deliver sufficient air quantities to dilute gases in mining faces, which could result in the gas concentration over the required celling limit by government laws. Thus, the mine must stop production. In this paper, the high level roadway (HLR) is designed and the U + HLR new ventilation pattern is proposed to control gas emission in a longwall mining face. Using computational fluid dynamics simulation (CFD) software, the flow field and gas transportation in the mine gob are studied. The optimized ventilation parameters are summarized. It is found that the best vertical distance of the HLR is 35 m over the coal seam and the horizontal distance is 25 m from the air return roadway. It is recommended that the negative suction pressure design of the high level roadway should be ranged from 9000 Pa to 10000 Pa. Based on the study outcomes, the gas emission could be well controlled in mining faces and avoid any gas disaster accidents.

Słowa kluczowe

EN

high level roadway; gob; numerical simulation; u+hLR ventilation method

PL

symulacja numeryczna; wentylacja górnicza; kopalnia węgla

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2022
• Tom: Vol. 67, no. 4
• Strony: 715--728
• Opis fizyczny: Bibliogr. 14 poz., rys., tab., wykr.

Twórcy

autor

Ma Yongzhen

• China University of Mining and Technology, China

• https://orcid.org/0000-0003-2260-8837

autor

Cheng Jianwei

• China University of Mining and Technology, China

• https://orcid.org/0000-0003-4915-6295

autor

Zhang Rui

• China University of Mining and Technology, China

autor

Wang Zui

• China University of Mining and Technology, China

autor

Ran Dezhi

• China University of Mining and Technology, China

autor

Sheng Shuping

• China University of Mining and Technology, China

autor

Zhang Jufeng

• Longdong University, China

autor

Si Junhong

• North China Institute of Science and Technology, China

autor

Yu Zhaoyang

• Guizhou University, China

Bibliografia

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• [4] R.L. Wu, Theoretical study on the scope of “three zones” of gas unloading and extraction in coal seam group mining, China University of Mining and Technology (2011).
• [5] Q.C. Li, X. Zhu, Z.G. Wang, Improved Darcy equation for coal seam permeability calculation. Science and Technology Innovation Herald 12 (23), 56-58 (2015).
• [6] Y.P. Qin, Y.J. Hao, P. Liu, W. Liu, J. Wang, Numerical simulation of coal chip gas Fick diffusion. Journal of Liaoning University of Engineering and Technology (Natural Science Edition) 33 (7), 871-876 (2014).
• [7] S. Zheng, Y.A. Wang, Z.Y. Wang, G.X. Chen, Gas extraction and utilization in Chinese coal mines. Coal Mine Safety 9, 4-6 (2003).
• [8] A. Mark, C. Luis, V. Alexis, Porous Medium Flow with Both a Fractional Potential Pressure and Fractional Time Derivative. Chinese Annals of Mathematics 38 (1), 45-82 (2017).
• [9] P.D. Sun, Study of gas dynamics model. Coalfield Geology and Exploration 1, 33-39 (1993).
• [10] J.W. Cheng, X.R. Zheng, Y.D. Lei, A compound binder of coal dust wetting and suppression for coal pile. Process Safety and Environmental Protection 9 (31), 92-102 (2021).
• [11] S. Zhu, J.W. Cheng, W.T. Song, Using seasonal temperature difference in underground surrounding rocks to cooling ventilation airflow: A conceptual model and simulation study. Energy Science & Engineering 8 (10), 3457-3475 (2020).
• [12] J.W. Cheng, C. Qi, S.Y. Li, Modelling mine gas explosive pattern in underground mine gob and overlying strata. International Journal of Oil, Gas and Coal Technology 22 (4), (2019).
• [13] L. Wang, Experimental and numerical simulation study of gas deflagration propagation law in large tunnel and small pipeline, Harbin Engineering University (2021).
• [14] J.W. Cheng, Assessment of Mine Ventilation System Reliability Using Random Simulation Method, Environmental Engineering and Management Journal 5 (4), 841-850 (2016).

Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)