The Impact of Atmospheric Pressure Changes on Methane Emission from Goafs to Coal Mine Workings

Duda, Adam

doi:10.3390/en17010173

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…One method involves the installation of methane capture systems directly within coal mines. These systems utilize a combination of ventilation and gas extraction techniques to capture methane emissions at their source [60][61][62][63]. By implementing these technologies, coal mining operations can minimize their environmental impact and simultaneously harness methane as a valuable energy resource [64,65].…”

Section: Additional Information Onmentioning

confidence: 99%

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European Climate Policy in the Context of the Problem of Methane Emissions from Coal Mines in Poland

Gajdzik,

Tobór-Osadnik,

Wolniak

et al. 2024

Energies

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This paper presents a thorough examination of methane capture from Polish coal mines, contextualized within the framework of the European Union’s (EU) climate policy objectives. Through a strategic analysis encompassing the interior of coal mines, the surrounding environment, and the macro environment, this study elucidates the complex dynamics involved in methane emissions and capture initiatives. The key findings include a declining trend in absolute methane emissions since 2008, despite fluctuations in coal extraction volumes, and a relatively stable level of methane capture exceeding 300 million m3/year since 2014. The analysis underscores the critical role of government support, both in terms of financial incentives and streamlined regulatory processes, to facilitate the integration of methane capture technologies into coal mining operations. Collaboration through partnerships and stakeholder engagement emerges as essential for overcoming resource competition and ensuring the long-term success of methane capture projects. This paper also highlights the economic and environmental opportunities presented by methane reserves, emphasizing the importance of investment in efficient extraction technologies. Despite these advancements, challenges persist, particularly regarding the low efficiency of current de-methanation technologies. Recommendations for modernization and technological innovation are proposed to enhance methane capture efficiency and utilization.

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Section: Additional Information Onmentioning

confidence: 99%

“…When we narrowed the scope of the assessment of the quantity of methane captured to the years 2014-2022, the trend function changed its characteristics and had the form of (3): y = −2.9717x + 337. 63 (3)…”

Section: The Problem Of Methane Emissions From Coal Mines In Polandmentioning

confidence: 99%

European Climate Policy in the Context of the Problem of Methane Emissions from Coal Mines in Poland

Gajdzik,

Tobór-Osadnik,

Wolniak

et al. 2024

Energies

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Grid study on methane diffusion law in confined space of working face

Zhao,

Qu,

Wang

et al. 2024

Energy Science & Engineering

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The layout of methane sensors in the working face cannot meet the needs for monitoring methane concentrations within confined spaces, and it is challenging to determine the precise locations for manual inspections. Therefore, the working face is firstly divided into different areas and grids. Then combined with the characteristics of methane emissions and the measured data on site, the boundary conditions of simulation experiments are set up and the research is carried out on the diffusion law of methane in the confined space of the working face under different conditions. The experimental results show that methane emission intensity from coal walls affects its distribution. As emission intensity rises, methane nearer the coal wall decreases, while methane further away increases. Among coal mining points, point 2 shows the widest methane diffusion range. Rising wind speeds decrease methane diffusion from the coal wall, increasing vertical diffusion distance. Methane from the coal wall shifts to the air inlet, while methane from the mining point diffuses increasingly to the downwind side. The location of the maximum methane concentration generated from falling coal and its transportation process is only related to the location of the coal mining point. The key areas for methane monitoring in confined spaces of the working face should be the overlapping locations of the vertical‐3 and vertical‐4 areas and the horizontal‐1 and horizontal‐3 areas. The key areas for manual inspection should be the overlapping locations of the vertical‐2 and vertical‐3 areas and the horizontal‐1 area.

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Layout Optimization of High-Level Directional Boreholes to Prevent Downward Invasion of Carbon Dioxide from an Overlying Coal Mine Goaf

Li,

Chen,

Chen

et al. 2024

Fire

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For adjacent coal seams, the downward invasion of harmful gases from an overlying coal mine goaf to the lower mining face could occur, and a high-level drainage tunnel is usually adopted for disaster prevention. Due to the high cost, instead of a high-level drainage tunnel, the high-level directional boreholes are widely adopted. In this study, the effect of a high-level drainage tunnel to prevent the downward invasion of carbon dioxide from the overlying coal mine goaf is analysed by applying a flow model in the numerical simulation. Then, the high-level directional boreholes are analysed to investigate the possibility of taking the place of the high-level drainage tunnel. The research results show that (1) for close adjacent coal seams, the downward invasion range of harmful carbon dioxide from the overlying coal mine goaf reaches one-third of the mining face, around 60 m wide; (2) a high-level drainage tunnel can effectively prevent the downward invasion of carbon dioxide from the overlying coal mine goaf by reducing carbon dioxide concentration within 0.3%; (3) the nine high-level directional boreholes with a careful layout can reduce the downward invasion of carbon dioxide from the overlying coal mine goaf to keep carbon dioxide concentration below 0.8% at the mining area, ensuring the coal mining safety.

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The Impact of Atmospheric Pressure Changes on Methane Emission from Goafs to Coal Mine Workings

Cited by 4 publications

References 24 publications

European Climate Policy in the Context of the Problem of Methane Emissions from Coal Mines in Poland

European Climate Policy in the Context of the Problem of Methane Emissions from Coal Mines in Poland

Grid study on methane diffusion law in confined space of working face

Layout Optimization of High-Level Directional Boreholes to Prevent Downward Invasion of Carbon Dioxide from an Overlying Coal Mine Goaf

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