Coal is a critical natural resource in the world, which provides large amounts of energy and raw materials for meeting industrial demands in China, America, India, Indonesia, etc. [1,2].With mining depth becoming larger, the dynamic hazards induced by gas and mining disturbance are raised, especially coal and gas outburst [].The coal and gas outburst hazards always occur in mining during the ...
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The process of gas extraction involves tapping into coal seams (layers of coal embedded in the earth) with the goal of extracting the methane gas trapped within. This gas is a byproduct of coal formation and is both pure and nontoxic, making it a commercially attractive energy resource. The location of conventional and unconventional gas.
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In drift mines, a tunnel is dug horizontally into the side of a mountain. In slope mines, this tunnel is diagonal. In shaft mines, elevators are used to move coal through vertical tunnels. Figure c : Subsurface mining involves digging tunnels to access coal deposits that are deep underground.
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What is CSG. Coal seam gas is a nonrenewable energy resource that is a byproduct of coal. It is a 'pure' and 'nontoxic' gas and for this reason has attracted a lot of commercial interest. During the process of coal formation, biogenic and thermogenic methane gas forms. Much of this methane remains trapped in the microspores of the ...
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The coal seam to be mined is the #2 coal seam with a buried depth of 433708 m.
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Coal seam gas is a natural gas held in coal seams under pressure by groundwater. Coal seam gas wells release the gas by reducing the pressure through groundwater extraction. Extracted water and gas is diverted to surface infrastructure treatment and processing plants (Figure 1). The extracted water is termed 'coproduced water' (also ...
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Gas extraction is the main method to reduce gas content and eliminate gas accidents, and due to the influence of mining stress in the coal seam mining process, there are elastic damage zones and plastic damage zones of coal seams [3, 7]. Therefore, in order to improve the efficiency of gas extraction, it is necessary to study the elastic ...
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Reservoir properties governing the emission of methane from coal seams can be divided into two groups: (1) properties that determine the capacity of the seam for total gas production,, adsorbed gas and porosity, and (2) properties that determine the rate of gas flow,, permeability, reservoir pressure, and diffusivity of coal.
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The gas in a coal seam is a clean energy source, but it is also the main cause of gas accidents during the mining of mineral resources. There is a large pressurerelief gas influx in the upper and lower adjacent layers of 1211 working face in the Wanfeng Coal Mine in Jinhui, Shanxi Province, China. Based on the evolution law of overburden fractures, the collaborative pressurerelief gas ...
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The coal seams 7 # and 8 # in the Huaibei mining area, Anhui province, are outburst tendency. The 7 # coal seam was mined as the upper PCS to prevent coal and gas outbursts in the 8 # coal seam ...
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Coal seam gas (CSG) is a natural gas, consisting primarily of methane, which collects in underground coal seams by bonding to the surface of coal particles.
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1. Introduction. Coal mine gas disaster is always the most dangerous in the process of coal mining [1].The determination of coal seam gas content is one of the fundamental key works involving the regional prediction of coal and gas outburst, validity check of outburst prevention, prediction of coal mine gas emission and designing gas drainage systems [2], [3].
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The change of gas emission or concentration level at the working face is one of the main precursor characteristics of coal and gas outburst. At present, coal and gas outburst monitoring and early warning are mainly based on whether it exceeds the limit and its change law. However, the gas concentration level is affected by factors such as coal seam gas content, permeability, and mining process ...
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Integrated coal production and gas extraction must be considered as a system which involves the exploration and measurement of stress field redistribution, deformation and failure of coal and rock, gas pressure and permeability, and gas desorption and migration during the process of coal mining. Fundamental theory
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COAL MINING METHODS Surface Mining In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction.
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Coalbed methane (CBM), is also known as coalbed gas and coal seam gas/methane (CSG/CSM), which are terms referring to the unconventional natural gas resource stored in coal beds and are expected to be an important energy resource of global significance in the future (Rightmire 1984; Rice 1993; Flores 1998, 2013; Palmer 2010; Yang and Liu 2021). ...
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Coal seam water injection is vital in mitigating dust pollution in coal mining operations. To investigate water imbibition and adsorption behavior on the coal surface following injection into coal seams, as well as the impact of surfactants, coal particles with sizes of 68 mm, 35 mm, and mm were selected from the Dongtan Coal Mine in Shandong Province, China.
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A Wyoming coal mine that supplies fuel to a power plant that will be converted to burn gas instead of coal will lay off 19 workers ... West ia added 1,500 coal mining jobs in 2022 and ...
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In addition, mining disturbance and gas drainage will break the gasair balance in the coal seam, resulting in gasair migration driven by the pressure difference (Liu et al., 2020a, Liu et al., 2020b). Gasair migration in coal seams is shown in Fig. 1(a) and (c).
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From this, the primary equipment and key production technologies were determined for the proposed softrock protective seam mining. Finally, in combination with the optimal arrangement of the working face, the pressurerelief gas extraction technology accomplished the pressurerelief mining of the protected coal seam. 2.
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The nation's coal mines are major emitters of methane, and that is complicating global talks on reducing this potent greenhouse gas. By Christian Shepherd. December 1, 2023 at 5:00 EST ...
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The No. 25050 working face in Xuehu Coal Mine in Henan Province, China*** was selected to test field EP signals and further analyze the response characteristics of EP signals to the mining process of coal seam. The roadway distribution in the working face is displayed in Fig. 1, with the mining depth of the coal seam reaching 700 m. In this ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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