method to distribute air quantity in coal mine ventilation design, and then provide the mine operator with the essential opinions and e˙ective operations for day-to-day management in a coal mine ...
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Most operation optimisation studies based on data mining methods are local optimisations of certain devices, variables, or working conditions and may not be capable of dealing with complex coal-fired power units, which may experience a series of different working conditions. ... Determination of benchmark values. The coal quality of the 1000 …
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Coal resources are an integral part of China's energy security, with coal consumption accounting for 56.2% of China's total energy consumption in 2022 (Mushtaq et al., 2022).Based on China's "coal-rich, oil-poor, and gas-poor" resource endowment, coal will remain as the mainstay of energy consumption for a long time (Tang et al., 2018). ...
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The most common coal analysis is proximate analysis. It is used on coals during exploration, mining, and preparation. Four different parameters are measured from one sample in a proximate analyzer, which is an automated instrument. Ash yield (the material in coal that will not combust) Fixed carbon(the remaining carbon in coal after …
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The Xinjulong Coal Mine is located in the Juye Coalfield in Eastern China. The No. 2305 S working face of the coal mine has an average depth of −980.85 m, a mining length of 1904 m, and a mining width of 263.5 m. ... Investigation of the effect of caving height on the efficiency of the longwall top coal caving production method …
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Based on the above studies, the working safety management department has divided the coal spontaneous combustion process into three stages in the Safety Regulations in Coal Mine, namely the latent stage, self-heating stage, and combustion stage [34] (Fig. 1).However, the typical gas and its critical value, spontaneous …
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Consulting the Chinese safety industry standard for the "predicting method of mine gas emission rate" (AQ 1018-2006), for single coal seam mining, the mining influence coefficient may vary from 1.3 to 1.6, wherein 1.3 shall be chosen when the direct roof and floor of the active coal seam is shale, while 1.6 corresponds to carbonaceous or ...
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Currently, 35 coal mine underground water reservoirs have been established in the Shendong mining district and 95% of the water used for industrial, ... The foregoing analysis reveals the prediction method of water storage capacity in a horizontal mining district. However, the majority of coal resources are inclined seams, and the …
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Due to historical and technological limitations, China's residual coal reserves are estimated to be around 40 billion tons, of which 34% to 45% needs to be mined through upward mining [].Feasibility determination is the core prerequisite for upward mining [2,3].The current methods used to determine the feasibility of upward mining have …
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In a coal mine, air leakage exists in some roadways through doors and other ventilation structures inevitably. Based on this opinion, there are different views on whether these roadways must be assigned airflow in coal mine ventilation design. ... Analysis of distribution method of designed air quantity in coal mine ventilation-a case …
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Coal mining disturbs surface ecosystems in coal mining subsidence areas. Based on the groundwater–surface composite ecosystem analysis, we constructed an ecological disturbance evaluation index system (18 indices) in a coal mining subsidence area using the analytic hierarchy process (AHP). Taking the Nalinhe mining area in …
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According to physical simulation and theoretical model, the maximum surface subsidence of -2 seam mining in Ningtiaota coal mine are 1.1 m and 1.07 m respectively, which is basically ...
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A report on the methods and procedures for sampling and analysing coal, based on a survey of international and national standards. It covers topics such as sampling …
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A measured sample of coal is completely combusted in a bomb calorimeter, which is a device for measuring heat (ASTM method D5865-12; American Society for Testing and Materials, 2013, p. 648–666). Samples are mixed in a container under ASTM guidelines and then the "bomb" container is placed in the calorimeter for automated …
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Based on the analysis results of the influence of the third upper coal seam mining on the third lower coal seam mining in the previous chapter, the distance between the two layout modes of the outer staggered and the inner staggered is determined to be 6 m, and the numerical analysis model of three roadway layout schemes is established as …
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Evaluation methodology. Figure 2 exhibits the procedures and methods of constructing an EEQE evaluation system of the mining area. We select the indicators that can reflect the ecological ...
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Surface mining, also known as opencast mining, is the method of choice when (a) the coal seam is relatively shallow (40 to 50 m), (b) the overburden consists of …
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In order to explore the effective method for the comprehensive evaluation of ecological environment quality of environmental pollution governance in China's coal mining areas, based on the review of domestic and foreign research literature and the requirements and actual situation of environmental pollution control in China's coal …
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Coal seam mining causes fracture and movement of overlying strata in goaf, and endangers the safety of surface structures and underground pipelines. Based on the …
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Today, almost a third of American coal mines use longwall mining. Outside the U.S., that number is even higher. In China, the world's largest coal producer, more than 85 percent of coal is exracted using the longwall method. Underground Mining: Room and Pillar In the room-and-pillar mining method, miners carve a "room" out of coal ...
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The prevention and control of coal mine gas disaster are both crucial and challenging to mine safe production.The core issue lies in the accurate determination of coal seam gas content and ...
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Direct Method Determination of the Gas Content of Coal: Procedures and Results By W. P. Diamond and J. R. Levine UNITED STATES DEPARTMENT OF THE INTERIOR . ... As part of its coal mine health and safety program, the Bureau of Mines has developed a simple, inexpensive test to measure the methane content of ...
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This article discusses the importance of comprehensive coal analyses for coal utilization, research, and environmental and health issues. It explains how coal …
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Analysis of the mining status of the Baorixile open-pit coal mine in Fig. 2 shows that the main technical problems are: a large part of the north side of the 2nd mining district has been covered ...
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In production panels where pillars will be completely or partially extracted, an FS <1 may be used. In this whole analysis, the most uncertain part is often the determination of the compressive strength of the coal which determines the strength of the pillar. ... Dr. Syd S. Peng has classified underground coal mining method in China …
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In the coal mine, backfill mining method is used, and the gangue gypsum filling materials was used, by using this materials, the gangue generated during the coaling process was fully used and the ...
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The direct method test was developed for general mine safety applications by the U.S. Bureau of Mines in the early 1970's to measure the gas content of coal samples obtained from the relatively shallow depths of eastern U.S. coal mines.
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Surface mining and underground mining are the two most widely used coal mining methods (Lien, 2013, Mukherjee and Pahari, 2019), ... Fig. 8 (b) shows the effect size of runoff for different mining methods. An analysis of the extracted literatures reveals that more studies use surface mining than underground mining, and no study on runoff …
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Opencast coal mining method has become the dominant mode of extraction of coal due to adoption of heavy earth moving equipments. Extraction of coal by opencast mining method creates environmental problems and becomes economically unviable at a greater depth. ... Procedure for determination of local mine stiffness by BEM …
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4. Application of AHP-SPA model in coal mines. We chose the Yuan Shop coal mine as a case study to evaluate the proposed method. Yuan Shop coal mine is located in the eastern part of Anhui Province, China, it is the third largest coal mine in Anhui and has received a total investment of 253 million US $ to date.. The occupational …
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