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The abs. amt. of CO, CO2 and C2H6 generated by 1kg residual coal (CCO, CCO2 and CC2H6), which can reduce the influence of air leakage and residual coal mass on prediction index gases, were introduced to predict the spontaneous combustion in high gassy coal mine goaf. Then, the distribution diagrams of CCO, CCO2 and CC2H6 with temp. and O2 concn ...
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Ground fissures (GF), appearing in front of dumps, are one of the most obvious and harmful geological hazards in coal mining areas. Studying preferential flow and its influencing factors in the ground fissures of dumps may provide basic scientific support for understanding the rapid movement of water and vegetation restoration and reconstruction in mining areas.
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The 11101 working face of Qipanjing Mine was taken as the research object to explore the dynamic change law of the spontaneous combustion of the remaining coal in the gob-side entry retaining goaf area. A …
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1.3.3. Open pit mining 8 1.4. Underground coal mining 9 1.4.1. Room and pillar 9 1.4.2. Longwall 12 1.5. South African coal mining context 13 1.5.1. History of the South African coal mining industry 13 1.5.2. Current status of coal mining in South Africa 15 1.5.3. The role of South African coal market plays globally 18 1.6. Purpose of the study ...
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Multi-scale voids including fractures and bed separations will appear and dynamically develop as the underground mining-induced disturbance increases. The void fraction, which is an index for characterizing the void scale, is an important parameter for understanding the heat and mass transfer (including methane flow, coal spontaneous combustion, …
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By exploring the effects of the position of the air cooler on the temperature distribution of the mining face and the air flow in the inlet trough and provides a detailed analysis of the factors that affect the performance of cooling systems in underground coal mines, highlighting the importance of optimizing cooling strategies to ensure safe ...
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The air leakage in goaf can easily lead to disasters such as spontaneous combustion process of residual coal and gas accumulation, threatening production safety in underground coal mines. In order to study and master air leakage flow field distribution in goaf, the particle flow numerical simulation software PFC3D is used for the simulation of the …
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Jin et al. (2016a, b) took Zhuxianzhuang Coal Mine (Suzhou City, Anhui Province, China) as an exam-ple. Based on this, they studied the influences of remote lower protective coal seam mining (spacing of coal seams was 78 m) on gas control in the coal mine through numerical simulation, data statistics of gas drainage, measurement of residual ...
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Deformation and destruction of roadway surrounding rock is one of the main causes of coal mine accidents. In this paper, the horseshoe-shaped roadway model was established by particle flow code firstly and then analyzed the roadway damage process through the contact force chain, deformation displacement and distribution of micro-cracks. The research result …
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In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction. The elements of a surface mining operation are (1) topsoil removal and storage for later use, (2) drilling and blasting the strata overlying the coal seam, (3) loading and transporting this fragmented overburden material (called spoil), (4) drilling and blasting the ...
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Mining coal. Coal miners use large machines to remove coal from the earth. Many U.S. coal deposits, called coal beds or seams, are near the earth's surface, but others are deep underground.Modern mining methods allow U.S. coal miners to easily reach most of the nation's coal reserves and to produce about three times more coal in one hour than in 1978.
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Submersible pumps were installed for extracting the coal mine water. That is to say, main roadways were used in this work for flow and heat transfer of abandoned coal mine water. According to the drawing provided by the coal mine, main roadways had an average cross-section area of 13.85 m 2. The concrete with a thickness of 100 mm was paved for ...
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Power distribution system in a mine Electricity's application in the mining industry is a distinct area of both mining engineering and electrical engineering. Mining's difficult environment, dynamic power loads, cyclic and mobile operation, and stringent safety requirements all place unique demands on the mine power system. Mine power distribution …
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A recent study by the National Academies of Science, Engineering and Medicine (2018) reviewed respirable dust sampling and monitoring in coal mines. Among numerous recommendations, the study called for detailed characterization of respirable coal mine dust to shed light on the resurgence of occupational lung disease among miners in the United …
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A semicontinuous process system consisting of a single-bucket excavator, truck, crushing station, and belt conveyor is the main coal mining process system of a large-scale hard coal open-pit mine.
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Our open database on global coal and metal mine production 12 covers worldwide mining activities of metal ores and coal, on an individual mine level. It comprises 1171 mines, production data for ...
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The water-rich burnt rock may threaten the safe production of coal mines. Identifying the boundaries of burnt rock and the water-rich area is of great practical significance for the ensuring the ...
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Coal mining - Underground mining: In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and the overlying and underlying strata. Access to the coal seam is gained by suitable openings from the surface, and a network of roadways driven in the seam then facilitates the installation of …
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Zhang et al. (2021) conducted a CFD comparative analysis on the pollution characteristics of coal dust generated by turbulent airflow from coal cutting in the fully mechanized mining face, finding that the turbulence not only increased the intensity of the turbulent flow field but also caused a positive offset in the airflow, increasing the ...
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Despite international efforts to limit worker exposure to coal dust, it continues to impact the health of thousands of miners across Europe. Airborne coal dust has been studied to improve risk models and its control to protect workers. Particle size distribution analyses shows that using spraying systems to suppress airborne dusts can reduce particulate matter …
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A high-pressure and large-diameter extraction borehole is used in coal mines due to lack of understanding of the mechanism of negative pressure in the process of gas …
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The open-pit coal mine dump in the study area contains many low-concentration heavy metal pollutants, which may cause pollution to the soil interface. Firstly, statistical analysis and geostatistical spatial interpolation methods described heavy metal pollution's spatial distribution. The mine dump heavy metal pollution distribution is strongly random due to …
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12. Splitting A split is a branch of air current taken from the main air current which travels inbye from the DC shaft. • Each ventilating district is ventilated by a separate split. • When a mine has several working districts, it is preferable to divide or split the air required for the mine to the respective quantities needed in these districts and supply them through separate ...
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The flow distributors effectively avoid the occurrence of jet phenomena within the baghouse and significantly reduce the quality of dust on the surface of the filter bag. The weight has decreased by approximately 24.6 % in Case B (a flow distributor with four baffles perpendicular to the flow direction) compared to Case A (without a flow ...
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Figure 18 is a vortex flow distribution map of the vortex area in the roadway of different ventilation ducts. In the figure, the position and range of the vortex flow of No. 1, 2, and 3 are ...
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We provide coal conveyors for transporting coal on the port and coal mobile shiploader for loading coal into container of bulk vessels. Mobile Shiploader for Coal. We provide coal conveyor component for sale. You can get all types of …
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The sputnik hydraulic distributor (so called as it resembles the Russian "Sputnik" satellite in outer shape) is widely employed to mix run-of-mine coal and water in the first stage …
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Globally, studying the impact of coal mining on groundwater remains challenging. This is because the exploitation of coal resources and the sustainable development of groundwater resources involve economic, social, and environmental aspects. Over the last few decades, the number of publications on groundwater-related studies in coal mining areas has …
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SKE provides belt coal conveyor machine for mine, port, power plant, steel plant, etc. We not only supply conveyors but also coal conveyor component such as coal conveyor rollers, pulleys, belts, and conveyor structures.
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In coal mining, conveyor belts are essential for moving large volumes of coal from extraction points to processing plants or loading areas. These systems help streamline coal transport, …
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In coal mine paste filling technology, geomaterials like coal gangue and fly ash are used as the main component, and cement is applied as the cementing material.
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1. Introduction. Coal is one of the most important energy resources in the world, apart from gas and oil (Jundika et al., 2014), and China is the world's largest coal producer, accounting for 37% of global coal production (Yuan, 2011).In China, 90% of the coal mines are underground mines, and 51% of them are highly gassy mines (Yuan, 2009).Long-term and …
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Taking a coal mining face in Shaanxi Province, China as the research object, a mathematical model of gas flow was constructed. Through finite element numerical simulation, the pressure and velocity distribution of gas in the goaf fracture field were obtained, and the influence of vertical fracture field on gas flow was analyzed.
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Most of the coal in China is exploited via underground mining, in which the gas pressure increases with the mining intensity and depth. However, Chinese coal mines encounter various dynamic disasters arising from the following factors: complex geological conditions, harsh working environment, backward technical equipment and chaotic safety management [1, 2].
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A large number of field experiments have shown that the method of gas drainage can effectively solve the problem of gas overrun in coal mining face [4], [5], [6].In fact, the study of gas drainage is based on the distance between intubation and drainage negative pressure [7], [8], [9], [10].The coal mining intensity increases year by year with the update and iteration of coal …
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