Numerical study on the evolution of methane explosion regions in the process of coal mine fire zone sealing

Wang, Guoqin; Shi, Guoqing; Wang, Yanming; Shen, Haoyang

doi:10.1016/j.fuel.2020.119744

Cited by 32 publications

(10 citation statements)

References 27 publications

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“…Among others, Oberholzer and Meyer (1995) used CFD to evaluate the effectiveness of various ventilation systems used to dilute methane in mine excavations and remove dust from them. In turn, Wang et al (2021) used CFD to analyse the distribution of methane concentration in goaf zones and its interaction with fire hazard. Mishra et al (2018), on the other hand, studied the influence of selected geological and mining factors on the distribution of methane concentration in a tailgate.…”

Section: Introductionmentioning

confidence: 99%

Applying Model Studies to Support the Monitoring of Methane Hazard during the Process of Underground Coal Mining

Tutak,

Brodny,

Małkowski

et al. 2023

Production Engineering Archives

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The process of underground mining is one of the most complex and hazardous activities. In order to maintain the continuity and efficiency of this process, it is necessary to take measures to reduce this hazard. The paper addresses this issue by presenting a developed methodology for using model studies and numerical simulations to support the process of monitoring methane hazards. Its basis is the developed model of the region of underground mining exploitation along with the ventilation phenomena occurring in it. To develop it, the ANSYS Fluent program was used, based on the finite volume method classified as computational fluid mechanics. The model reflects both the geometries and physical and chemical phenomena occurring in the studied area, as well as the auxiliary ventilation equipment used during operation. The research was conducted for two variants of methane emissions from goaf zones, the first of which concerned the actual state of the mining area, and the second of which concerned increased methane emissions from these goaf zones. The purpose of the study was to determine the distribution of methane concentrations in the most dangerous part of the studied area, which is the intersection of the longwall and the tailgate, as well as the distribution of ventilation air flow velocities affecting them. The studies for both variants made it possible to determine places particularly exposed to the occurrence of dangerous concentrations of methane in this region. The methodology developed represent a new approach to studying the impact of methane emissions from goaf zones into mine workings.

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Section: Introductionmentioning

confidence: 99%

Applying Model Studies to Support the Monitoring of Methane Hazard during the Process of Underground Coal Mining

Tutak,

Brodny,

Małkowski

et al. 2023

Production Engineering Archives

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“… 3 − 5 When a coal mine fire occurs, it not only causes massive casualties and losses but also leaves behind intractable pollution, which continues to affect the coal mining environment. 6 , 7 Among coal mine fires, 90% are caused by the spontaneous combustion of coal. 8 …”

Section: Introductionmentioning

confidence: 99%

“…Coal is closely related to economic development and people’s lives and is a primary energy source globally . However, coal mines have long been plagued by various disasters, of which, coal mine fires are the most serious. − When a coal mine fire occurs, it not only causes massive casualties and losses but also leaves behind intractable pollution, which continues to affect the coal mining environment. , Among coal mine fires, 90% are caused by the spontaneous combustion of coal …”

Section: Introductionmentioning

confidence: 99%

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

et al. 2022

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Considering disadvantages such as the low thermal stability and environmental pollution of existing gel inhibitors, a green and stable intumescent nanoinhibitor (INI) was prepared and tested. First, polyacrylamide (PAM), nano-silica, and intumescent flame retardant (IFR) were selected as raw materials. The INI was prepared by nanoparticle modification and cross-linking polymerization. Then, the structure and physical properties of INI were tested by Fourier transform infrared spectroscopy, scanning electron microscopy, and rheological experiments. Meanwhile, the inhibition performance of INI was studied through thermogravimetric analysis-Fourier transfer infrared spectroscopy (TGA-FTIR) analysis. The results suggest that the nanomodification improved the dispersibility of INI particles. The addition of modified nano-silica (MNS) and IFR enhances the strength of the reticular structure, thereby improving the transport convenience and covering ability of the INI gel. At high temperatures, IFR can generate a porous foamed carbon layer that further coats the coal. After INI inhibition treatment, the characteristic temperature and activation energy of coal were significantly improved, and the production of carbon monoxide and carbon dioxide decreased. Hence, irrespective of physical properties, physical inhibition performance, or chemical inhibition performance, INI performed well. Research results can provide valuable references for the preparation and performance study of a coal spontaneous combustion inhibitor.

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“…With the utilization of coal resources, the mining intensity increases year by year, and the underground mining conditions become more complex, resulting in an increase in disasters and accidents, such as fires, explosions, and outbursts. , After a coal mine disaster, the rapid sealing and isolation control of the disaster area can effectively prevent further accidents. , To improve the mine emergency response ability to deal with disasters and accidents, scholars conducted relevant research on the technology and equipment for rapid closed isolation of disaster areas after disasters. − Chang proposed a solidified door structure for a mine rescue cabin, established a three-dimensional model of a mine mobile protective closed door, and analyzed the strength of an arc door with ANSYS software. The results showed that the strength and stiffness of the arc door are better than those of the ordinary flat door.…”

Section: Introductionmentioning

confidence: 99%

“… 3 , 4 To improve the mine emergency response ability to deal with disasters and accidents, scholars conducted relevant research on the technology and equipment for rapid closed isolation of disaster areas after disasters. 5 − 7 Chang 8 proposed a solidified door structure for a mine rescue cabin, established a three-dimensional model of a mine mobile protective closed door, and analyzed the strength of an arc door with ANSYS software. The results showed that the strength and stiffness of the arc door are better than those of the ordinary flat door.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of a Sealing Airbag under Different Impact Types and Impact Pressures

Liu

Wei

et al. 2022

ACS Omega

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The rapid isolation of the disaster area underground coal mine can effectively prevent the spread of disaster accidents. Rapid sealing of the disaster area can be realized through sealing in the form of an inflatable capsule. The cushioning performance of the inflatable capsule to an explosion shock wave is an important factor affecting sealing reliability. The response process of a small inflatable capsule under an explosion shock wave was studied using the pipeline explosion experimental system to examine the dynamic response characteristics of the coal mine airbag under the impact load. The deformation buffering process of the inflatable and hydrogel capsules was tested by a drop hammer impact test. Results showed that under the action of three explosion impact pressures (0.3, 0.4, and 0.5 MPa), the inflatable capsule could absorb 22% of the impact energy through its deformation and reduce the maximum explosion impact pressure. Moreover, under the impact of falling weight at different heights (20, 30, 40, and 50 cm), the cushioning process of the inflatable and hydrogel capsules absorbed the impact energy through the compression deformation of the capsule, which is the loading stage. When the hammer speed decreased to zero, the deformation and absorbed energy of the capsule were at maximum. The capsule recovered its deformation and converted the absorbed energy into kinetic energy to make the hammer rebound, which is the unloading stage of the capsule. The capsule body realized the absorption and transfer of impact energy through its deformation and completed the energy buffer through the dynamic response process of multiple loading and unloading.

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Numerical study on the evolution of methane explosion regions in the process of coal mine fire zone sealing

Cited by 32 publications

References 27 publications

Applying Model Studies to Support the Monitoring of Methane Hazard during the Process of Underground Coal Mining

Applying Model Studies to Support the Monitoring of Methane Hazard during the Process of Underground Coal Mining

Characterization and Performance Testing of an Intumescent Nanoinhibitor for Inhibiting Coal Spontaneous Combustion

Dynamic Response Characteristics of a Sealing Airbag under Different Impact Types and Impact Pressures

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