Control technology for the avoidance of the simultaneous occurrence of a methane explosion and spontaneous coal combustion in a coal mine: A case study

Qin, Botao; Li, Lin; Ma, Dong; Lü, Yi; Zhong, Xiaoxing; Jia, Yuwei

doi:10.1016/j.psep.2016.07.005

Cited by 86 publications

(19 citation statements)

References 30 publications

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“…The shape of the air flow transport route is similar to the letter "U," which is called "U" ventilation system. [23][24][25][26][27][28][29] For a long time, most scholars have studied the "three zones of spontaneous combustion" in association with a "U" ventilation system. The shape of the air flow transport route is similar to the letter "Y," which is called "Y" ventilation system.…”

Section: Coal Enterprises In Chinamentioning

confidence: 99%

“…To study the problem of fire prevention and extinguishing under the condition of non-pillar coal mining technology, especially the coal spontaneous combustion mechanism, scholars have conducted considerable studies. [23][24][25][26][27][28][29] For a long time, most scholars have studied the "three zones of spontaneous combustion" in association with a "U" ventilation system. 30 Generally, the gas pressure in goaf of "U" ventilation system is fan-shaped distribution with the center of the intersection of working face and air inlet and air return way.…”

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confidence: 99%

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Evolution characteristics of spontaneous combustion in three zones of the goaf when using the cutting roof and release pressure technique

Chen

Guo³

et al. 2019

Energy Science & Engineering

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The changes associated with the cutting roof and release pressure mining method in the three zones that are susceptible to spontaneous combustion in the goaf with “Y” type ventilation system were studied. For the investigated underground coal mine working face, its three zones of spontaneous combustion have a “U” type ventilation system for the traditional mining method and a “Y” type ventilation system for the cutting roof and release pressure mining method. These systems were monitored using a beam tube method, and the evolution characteristics of spontaneous combustion of the three zones was analysed. The monitoring data showed that when using a traditional mining method with a “U” type ventilation system, the scattered tropical zone converts into the oxidation heating zone after 68.5 m in the goaf, and the suffocative zone presents after 85.5 m. For the cutting roof and release pressure mining method together with a “Y” type ventilation system, the scattered tropical zone converts into the oxidation heating zone after 84 m in the goaf, and the suffocative zone appears after 198.8 m. Compared to traditional mining, the width of the oxidation heating zone increases when using the cutting roof and release pressure method. To prevent spontaneous combustion of the goaf, the comprehensive techniques of the pressure balance for fire control, ground fissure sealing, working face sealing, retained roadways guniting and inert gas fire extinguishing have been used in the studied coal mine. The CO concentration of the goaf is less than 300 ppm during the mining process. Safe mining of the tested working face shows that the cutting roof and release pressure technique can be applied to control the coal seam spontaneous combustion.

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Section: Coal Enterprises In Chinamentioning

confidence: 99%

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confidence: 99%

Evolution characteristics of spontaneous combustion in three zones of the goaf when using the cutting roof and release pressure technique

Chen

Guo³

et al. 2019

Energy Science & Engineering

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“…Methane control techniques are often the cause of increasing the risk of coal spontaneous coal combustion in the minedout area known as the goaf in longwall mining system. These causes include increased migration of air through the goaf due to the increase in the amount of air for diluting methane in the tailgate road or the improper design of drainage boreholes above the caving zone [29,32,40,44].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, spontaneous coal combustion in the goaf may lead to methane explosion followed by a coal dust explosion [29,36]. Cases of self-ignition of coal followed by methane explosion at sudden air inflow into the goaf with a methane-air mixture are known from mining practice both in Poland [37] and in China [4].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Safety in the Polish High-Methane Coal Mines: an Overview

Szlązak

Obracaj

Swolkień

2020

Mining, Metallurgy & Exploration

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Polish coal mines are characterized by severe geological conditions and the co-occurrence of natural hazards. These hazards are associated with methane and dust emissions during mining processes which can provide methane, dust or methane-dust explosions. Besides, there are such natural hazards as gas and rock outbursts, rock bursts, spontaneous combustion of coal and environmental heat load. The mutual influences of various geological conditions, as well as the natural hazards, intensify the increase of the methane explosion hazard. The occurrence of methane explosions in the Polish mining industry between 2013 and 2108 are analyzed. Fatal accidents are compared with similar events in the global mining industry. The methods of preventing the explosion hazard as well as methane emission control in the Polish coal mining sector are presented. Methane hazard prevention should be adapted to levels and other natural hazards, especially those related to ventilation of underground mine. The methods of preventing methane emissions into mine excavations are often contrary to the means of preventing other ventilation-related hazards in the underground mine, e.g. the prevention of spontaneous combustion of coal in the goaf of longwall panel. Therefore, the design of longwall panels should be preceded by a detailed analysis of the results of both methane emission prediction and forecast of other ventilation-related hazards.

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Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

Min,

Liu,

Chen

et al. 2023

Energy Science & Engineering

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The number of mines using roof cutting and pressure relief technology to extract mine deep coal resources is increasing daily. Most of these mines are facing the risk of high gas emission and residual coal spontaneous combustion disasters, and the composite disasters caused by these two risks also threaten the safety of mine production. On the basis of constructing a model for the evolution of porosity and permeability in a single side roof cutting along the gob, this study studied the occurrence locations of gas explosion risk areas, oxidation and heating risk areas, and composite disaster areas under different air supply and gas emission conditions, and summarized the evolution laws of composite disaster risk areas. The research results show that the roof rock collapse caused by roof cutting and pressure relief technology reduces the permeability of porous medium, which significantly reduces the sensitivity of the width of the oxidation temperature rise zone and the composite disaster area to the air supply. The increase in air supply causes the position of the composite disaster risk zone inside the goaf to shift toward the deep part of the goaf, while the width remains basically unchanged. The increase in gas emissions has suppressed the occurrence of coal spontaneous combustion in the goaf, while also keeping the gas concentration in a large area outside the upper limit of gas explosion. The research content enriches the research system of gas and oxygen flow fields in the goaf cutting face, and has positive significance for the promotion and application of goaf cutting technology and the understanding of secondary disasters caused by it.

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Control technology for the avoidance of the simultaneous occurrence of a methane explosion and spontaneous coal combustion in a coal mine: A case study

Cited by 86 publications

References 30 publications

Evolution characteristics of spontaneous combustion in three zones of the goaf when using the cutting roof and release pressure technique

Evolution characteristics of spontaneous combustion in three zones of the goaf when using the cutting roof and release pressure technique

Enhancing Safety in the Polish High-Methane Coal Mines: an Overview

Investigation on risk fields assessment in the longwall working face with single side roof cutting along the gob

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