Ventilation arrangement evaluation and proactive goaf inertisation for spontaneous combustion and gas explosion management during longwall panel sealing-off process

Qiao, Ming; Ren, Ting; Roberts, Jon; Li, Zhongbei; Wu, Jianming

doi:10.1007/s11356-023-30575-9

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…At present, numerical calculation is the main tool for studying the gas migration process in large-scale mining areas. − Taking the 8105 working face of the Madaotou mine as the engineering background, Fluent 3D numerical calculation software was used to establish a numerical calculation model of the flow field in the working face of extra-thick spontaneous combustion coal seams. On this basis, the effects of nitrogen injection in the goaf and air intake in working face on the distribution of oxygen concentration in the mining area were studied.…”

Section: Methodsmentioning

confidence: 99%

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Zheng,

Liu,

Liu

et al. 2024

ACS Omega

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Low-oxygen (oxygen concentration below 18.5%) phenomena often occur in the top coal caving working face of ultrathick coal seams, posing a serious threat to the safety of workers. The characteristics of oxygen consumption and gas production at low-constant temperature and the corresponding functional group evolution of residual coal in goaf were studied by temperatureprogrammed and infrared spectrum experiments. The influence of different factors on the emission of low-oxygen gases was studied through numerical calculation. The results show that low-temperature oxygen consumption and gas production occurred when the coal was about 40 °C. When the temperature was constant, the oxygen consumption and gas production rate increased with the extension of time. In the early stage of coal oxidation, the aliphatic C−H components were attacked by oxygen molecules and reacted with them. The asymmetric methyl and methylene groups were more likely to oxidize and produce carbonyl compounds. With the increase of nitrogen injection, the overall width of the oxidation zone (oxygen concentration was defined as 10−18%) narrowed, and the range of the oxidation zone moved forward from the depth of the goaf. The oxygen concentration in the air return corner decreased gradually, and the low-oxygen area in the air return corner expanded gradually. The distance between the lowoxygen area of the working face and the air intake corner was gradually shortened. With the increase of air intake, the width of the oxidation zone increased and moved to the depth of goaf, and the degree of low oxygen in the air return corner increased. The research results are of great significance for the understanding and prevention of the low-oxygen phenomenon in ultrathick coal seams.

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Section: Methodsmentioning

confidence: 99%

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Zheng,

Liu,

Liu

et al. 2024

ACS Omega

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“…In the treatment of outcrop fire areas, techniques such as stripping, yellow mud injection, inert gas injection and loess covering are generally adopted 32 – 35 . Shao et al used the three-phase foam and water mist technology to deal with the upper fires in abandoned roadways and loose areas and to control the coalfield fires in Anjialing open-pit mine in China 36 .…”

Section: Introductionmentioning

confidence: 99%

Detection and management of coal seam outcrop fire in China: a case study

Liu,

Qi,

Luo

et al. 2024

Sci Rep

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The outcrop fire area in Rujigou Coal Mine in Ningxia, China has been burning continuously for over 100 years. This not only results in wastage of resources but also poses significant damage to the ecological environment. Previous research on open fire detection has mainly focused on coalfield fire areas, using single method such as infrared remote sensing or surface temperature measurement, magnetic method, electrical method, radon measurement and mercurimetry. However, the outcrop fire area has migrated to deeper parts over the years, conventional single fire zone detection methods are not capable of accurately detecting the extent of the fire zone, inversion interpretation is faced with the problem of many solutions. In fire management, current research focuses on the development of new materials, such as fly ash gel, sodium silicate gel, etc., However, it is often difficult to quickly extinguish outcrop fire areas with a single technique. Considering this status quo, unmanned aerial vehicle (UAV) infrared thermal imaging was employed to initially detect the scope of the outcrop fire area, and then both the spontaneous potential and directional drilling methods were adopted for further scope detection in pursuit of more accurate results. In addition, an applicable fire prevention and extinguishing system was constructed, in which three-phase foam was injected for the purpose of absorbing heat and cooling. Furthermore, the composite colloid was used to plug air leakage channels, and loess was backfilled to avoid re-combustion. The comprehensive detection and control technologies proposed in this study can be applied to eliminating the outcrop fire area and protecting the environment. This study can provide guidance and reference for the treatment of other outcrop fire areas.

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Ventilation arrangement evaluation and proactive goaf inertisation for spontaneous combustion and gas explosion management during longwall panel sealing-off process

Cited by 2 publications

References 37 publications

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Research on the Low-Temperature Oxygen Consumption and Low-Oxygen Gas Emission Law in Goaf of Ultrathick Coal Seams

Detection and management of coal seam outcrop fire in China: a case study

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