Across the world, coal resource is widely utilized in industrial production. During coal mining activities, dynamic disasters may be induced, such as coal and gas outbursts, or rock burst, resulting in serious accidents or disasters. Previous studies have shown that electric potential (EP) signals can be produced during the deformation and fracture process of coal and rock mass under load. The ...
WhatsApp: +86 18838072829Coal is the mainstay of China's energy supply. With the gradual progress in China's policy of phasing out backward coal production capacity, the intensive and deep mining of coal has gradually become the new norm. The current mining depth is increasing at a rate of 10~15 m/year. The high crust stress, high gas pressure, high ground temperature, and engineering disturbance stress in deep ...
WhatsApp: +86 18838072829Another key challenge faced during coal gasification is greenhousegasemission reduction. To reduce the greenhousegas emission during coal gasification, clean coal technologies (CCT) can be applied at different stages of coal processing, such as preparation, gasification, removal of pollutants and capturingstoring CO 2 [ 125 ].
WhatsApp: +86 18838072829Naturalgas processing is a range of industrial processes designed to purify raw natural gas by removing ... ultimately coming out of solution as the pressure is reduced during production. ... often existing underground in a more concentrated state of adsorption onto the surface of the coal itself. Such gas is referred to as coalbed gas or ...
WhatsApp: +86 18838072829Coal 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 ...
WhatsApp: +86 18838072829In this study, the coal temperature during the outburst process was monitored using temperature sensors. The results show that the coal temperature decreased rapidly as the outburst progressed. ... "Research on Temperature Variation during Coal and Gas Outbursts: Implications for Outburst Prediction in Coal Mines" Sensors 20, no. 19: 5526 ...
WhatsApp: +86 18838072829He has reported from across Ukraine during the fullscale invasion. Dominic Nicholls. Dom is Associate Editor (Defence) at The Telegraph, having joined in 2018. He previously served for 23 years ...
WhatsApp: +86 18838072829Investigating the division of coal spontaneous combustion stages and the selection of indicator gases is significant to the safe production of coal mines. In this study, the characteristic temperature of coal spontaneous combustion, the generation law of indicator gases, the combustion process, and the division of the combustion stages of coal samples taken from Hongqingliang (HQL) and Dayan ...
WhatsApp: +86 18838072829Coalbed methane can be extracted from coal deposits before or during coal mining, and it can be added to natural gas pipelines without any special treatment. ... Natural gas processing can be complex and usually involves several processes, or stages, to remove oil, water, HGLs, and other impurities such as sulfur, helium, nitrogen, hydrogen ...
WhatsApp: +86 18838072829The underground coal mining process is accompanied by coal mine methane release. Methane is the main greenhouse gas emitted during coal mining (about 90%). Reducing coal mine methane emissions contributes to a significant reduction of greenhouse gas emissions. To determine the amount greenhouse gas emissions, as a result of production processes ...
WhatsApp: +86 18838072829Arsenic is a highly toxic element in coal and one of the representative toxic trace metals emitted from coalfired power plants, which is mainly converted into As 2 O 3 vapor during the combustion process of coal. When absorbed by the body, arsenic can cause arsenic poisoning, which not only causes metabolic disorders and subsequent neurotoxicity in the body but also retards growth in young ...
WhatsApp: +86 18838072829Coal and gas outburst accidents seriously threaten mine production safety. To further improve the scientific accuracy of coal and gas outburst risk prediction, a system software () was developed based on the C/S architecture, Visual Basic development language, and SQL Server 2000 database. The statistical process control (SPC) method and logistic regression analyses were used to assess ...
WhatsApp: +86 188380728291. Introduction. The demand for natural gas as the main clean, lowcarbon energy source has increased substantially in China, and external dependence will increase to as high as approximately 65% in 2030. 1−3 Due to the characteristics of primary energy in China, 4−7 many enterprises are investing in clean coal conversion processes, especially the development of commercial coalto ...
WhatsApp: +86 18838072829The gases evolution during the lowtemperature oxidation of coal is an essential parameter used to assess the state of coal oxidation and to estimate the gaseous pollutants. However, the current semiquantitative method, which employs gas concentration as the measurement standard, is flawed. This paper presents a quantitative calculation method for gas products during coal oxidation. N2 is ...
WhatsApp: +86 18838072829Coal and natural gasfired power plants create it, as do cars, agriculture, unpaved roads, construction sites and wildfires. ... A thick layer of smog seen engulfed during early hours of morning ...
WhatsApp: +86 18838072829Sintering accounts for about 50% of the total NOx emissions of the iron and steel industry. NOx emissions from the sintering process can be simulated using the emissions from coke combustion. However, the generation and emission law for NOx burning in the sintering process of pulverized coal is still not clear. The formation characteristics of NOx during coal combustion catalyzed by iron ore ...
WhatsApp: +86 18838072829The gasification process involves two distinct stages: coal devolatilization followed by char gasification, which is specific to the conditions of the reaction. The chapter also discusses the quality of various products obtained from coal gasification: low Btu gas, medium Btu gas, high Btu gas, methane, and hydrogen.
WhatsApp: +86 18838072829Coal fullprocess CO 2 emission accounting model, in which coal production, raw coal processing, logistics and transportation, conversion and utilization have a large amount of CO 2 gas discharge, coal gangue power generation in resource utilization, coal gangue building materials also increase carbon dioxide emissions Quantity, but the comprehensive utilization of coal mine gas and mine water ...
WhatsApp: +86 18838072829Synthetic Fuels: Coal can be converted into synthetic fuels like coal gas, coaltoliquid (CTL) fuels, and coalderived hydrogen. These can be used as substitutes for natural gas, gasoline, and diesel. ... Tailings are the finegrained waste materials produced during coal processing. They can be disposed of in tailings ponds or undergo further ...
WhatsApp: +86 18838072829During the mining process, abnormal coalmine gas emissions and gas over the safety limit in goaf often occur, which have seriously affected the safety of daily coal mining. As shown in Figure 16, the reasons leading to the above problems are various. According to the analysis results of the permeability model established above, it can be found ...
WhatsApp: +86 18838072829Global food systems accounted for 17 billion metric tonnes of carbon dioxide equivalent or 31% of humanmade greenhouse gas emissions in 2019, according to the United Nations' Food and Agriculture ...
WhatsApp: +86 18838072829Coal tar pitch (CTP) is abundant and widely used, but its properties will be affected due to oxidation aging during storage. In this study, CTP was oxidized by simulating the air oxidation process, and the change of chemical structure has been analyzed by Fourier transform infrared spectroscopy (FTIR), Xray diffraction (XRD), and both gas chromatography and mass spectrometry (GCMS).
WhatsApp: +86 18838072829It can be seen from Figure 3a that the release intensity of CH 4 gas during coal pyrolysis in the H 2 atmosphere is higher than that in the CH 4 and N 2 pyrolysis atmospheres. Figure 4 shows the infrared spectra of semicokes prepared in N 2, H 2containing, and CH 4containing atmospheres at different pyrolysis temperatures.
WhatsApp: +86 18838072829During the combustion process, the values of apparent activation energy in the O 2 /CO 2 /N 2 atmosphere were approximately 3358% lower than that in the O 2 /N 2 atmosphere for BLT coal, while ...
WhatsApp: +86 18838072829The indicative ability of a gas indicator for the spontaneous combustion of coal is affected by the secondary oxidation of oxidized coal, from old goafs, entering a new goaf through air leakages. This phenomenon can affect the accuracy of early warning systems regarding the spontaneous combustion of coal in a goaf. In this research, three kinds of coal were selected to carry out a spontaneous ...
WhatsApp: +86 18838072829of the particulate removal process is the removal of coal dust, ash, and tar aerosols in the raw product gas. During tar and oil removal and gas quenching and cooling, tars and oils are condensed, and other impurities such as ammonia are scrubbed from raw product gas using either aqueous or organic scrubbing liquors.
WhatsApp: +86 18838072829This drives off impurities such as coal gas, carbon monoxide, methane, tars, and oil. The resulting material—coal with few impurities and high carbon content—is coke. The method is called coking. ... Synthetic Products The gases that are released during the coking process can be used as a source of power. Coal gas can be used for heat and ...
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