crushing of coal in low temperatures
Study on the Influence of the Mechanical Crushing Process on Low ...
2022年11月8日 In the process of mechanical crushing, the coal sample not only changes in physical structure but also changes in chemical structure. With the decrease in particle size of
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Effect of mechanical energy input during mechanical crushing on
2024年3月1日 Mechanical energy input (MEI) enhanced the coal–oxygen reaction (COR) strength. MEI lowered the ignition and burnout temperatures of the coal samples. MEI
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Insight into the low-temperature oxidation behavior of coal
2022年12月15日 Coal can emit carbon oxides(CmOn) including CO and CO 2 at low temperature and hydrocarbon(CxHy) such as C 2 H 4,C 2 H 6 at temperature over 120 °C,
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Evolution and mechanisms of low-temperature oxidation and
2022年3月14日 By thermogravimetry (TG) experiments, evolution behaviors and properties of thermal oxidation processes at low temperature of a bituminous coal with five microscale
MoreStudy on the Influence of the Mechanical Crushing Process on Low ...
2022年11月8日 In the process of mechanical crushing, the coal sample not only changes in physical structure but also changes in chemical structure. With the decrease in particle size of
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Micro-structure of crushed coal with different ... - ResearchGate
2020年5月1日 To explore the microstructure and oxidation reactivity of crushed coal, the free radicals and functional groups of coals with different ranks in the crushing process were
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Micro-structure of crushed coal with different metamorphic
2020年8月1日 Low-temperature oxidation of two Indonesian low rank coals was characterized by Thermogravimetric analysis (TGA). The effect of particle size on the spontaneous
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Study on the Influence of the Mechanical Crushing Process on Low ...
By comparing and analyzing the changes in CO and CO 2 emission, cross-point temperature, heat release intensity, and apparent activation energy of coal samples with different particle
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Dynamic Mechanical Properties of Coals Subject to the
2019年12月27日 In this work, the effects of low temperature gradient on the dynamic mechanical properties of coal were studied through SHPB Dynamic Impact Test, the law of dynamic mechanical parameters of...
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Sources of underground CO: Crushing and ambient temperature oxidation ...
2015年11月1日 A survey carried out by Wang et al. (2012) indicates that low rank coal contains numerous hydroxyl radicals and hydroxyl and carbonyl play significant roles in generating CO, by detecting variation in the IR of coals with different coal ranks during low-temperature oxidation.
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Effect of mechanical energy input during mechanical crushing on
2024年3月1日 The CO production observed by scholars during mechanical crushing of coal at room temperature and in an inert environment is good evidence for this chemical ... Study on the influence of the mechanical crushing process on low-temperature oxidation characteristics of coal samples. Combust Sci Technol (2022), 10.1080/00102202.2022. ...
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Experimental study on the transporting and crushing effect of gas
2023年11月1日 To explore the migration and crushing characteristics of the outburst coal, outburst simulation experiments under different gas pressures (0.3 MPa, 0.5 MPa, and 0.8 MPa) were carried out using ...
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Energy Evolution and Coal Crushing Mechanisms Involved in Coal
2023年12月16日 Comparing Tests 2 and 4, under the same experimental conditions (coal sample quality, coal particle size, ambient temperature, ... This suggests that the role of gas expansion energy in coal crushing is limited under low gas pressure conditions. If the gas expansion energy is low, coal will not be completely crushed.
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Dynamic Mechanical Properties of Coals Subject to the Low Temperature ...
2019年12月27日 The effects of low temperature gradient on dynamic mechanical properties of coal were examined through Split-Hopkinson Pressure Bar (SHPB) Dynamic Impact Experiment, the law of dynamic mechanical ...
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Carbon Dioxide Prevents Oxygen Adsorption at Low-Temperature
2023年8月20日 Carbon dioxide (CO2) is widely used in the prevention and control of spontaneous coal combustion. In this manuscript, three low-rank coals with different metamorphic degrees were selected as the research objects. The temperature-programmed experiments, in situ infrared cooling experiments, simulation of the competitive adsorption of
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Free radical reaction characteristics of coal low-temperature
2016年9月10日 Study on the mechanism of coal spontaneous combustion is significant for controlling fire disasters due to coal spontaneous combustion. The free radical reactions can explain the chemical process of coal at low-temperature oxidation. Electron spin resonance (ESR) spectroscopy was used to measure the change rules of the different sorts and different
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Natural desorption of carbon monoxide during the crushing of coal ...
2020年9月20日 The concentration of the above gases increases with the temperature of coal self-heating (Dai, 2007; Liang, 2008). Lu et al. (2004) found out that carbon monoxide can be applied as an indicator gas for the purpose of forecasting coal
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Law of low temperature oxidation affected to carbon monoxide
In order to set up the quantitative relationship between the specific surface area increased and the CO production value during the coal crushing process, and explain the influence law of the low temperature oxidation occurred from coal after the coal crushed to the CO production value.A full closed type coal sample crushing test instrument, gas chromatography, specific surface
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Natural desorption of carbon monoxide during the crushing of coal ...
2020年9月20日 It was observed that low temperature coal oxidation constitutes the major factor responsible for the self-heating of coal as well as an important source of gas emissions. ... In goaf zones where the crushing of coal occurs and the coal surface area exposed to the mine atmosphere sharply increases resulting in intensive gas ...
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Analysis of the influence of temperature on the
2024年6月18日 The changing patterns of coal gas adsorption characteristics, adsorption theories, and the temperature response of gas expansion were analyzed. Furthermore, engineering measures for preventing gas outbursts in
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An analysis of impact load and fragmentation dimension to
This research delineates the energy dissipation characteristics in coal crushing under impact loads, leveraging the capabilities of Separated Hopkinson Pressure Bar experimental system. A meticulous
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Optimization of Operating Parameters for Coal Low
2022年9月2日 Low-temperature oxygen-plasma ashing plus X-ray diffraction analysis is one of the effective techniques to identify minerals in coal. However, previous publications have not provided any details of the exact low
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Micro-structure of crushed coal with different metamorphic degrees and ...
2020年8月1日 To explore the microstructure and oxidation reactivity of crushed coal, the free radicals and functional groups of coals with different ranks in the crushing process were analyzed based on electron paramagnetic resonance (EPR) and Fourier transform infrared (FTIR) spectrometry.The low-temperature oxidation of different-sized crushed coals was also
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Numerical simulation study on the evolution law of mechanical ...
2024年4月8日 In order to study the effect of temperature on the structure and mechanical properties of coal with different metamorphic degree. Three coal samples with varying degrees of metamorphism were ...
MorePyrolysis characteristics and microstructure evolution of different ...
2022年7月18日 Coal pyrolysis is the basis of coal gasification, as it is the necessary reaction step in the coal conversion process. To study the pyrolysis characteristics of different coal grades under temperature, thermal simulation tests of three different ranks of coal were conducted, and the pore structure and gas products were analyzed by using liquid nitrogen adsorption and gas
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Modeling of the Crossing Point Temperature Phenomenon in the Low
2017年1月31日 Coal continues play a important role as one of the most widely used energy source in many countries. At the same time, self-ignition of low rank coals leading to spontaneous combustion accidents ...
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Experimentalstudyonadsorptionpromotionanddesorptionrestrain
teristics of coal in low-temperature environment (30, 10, 0, −10, −30 °C). At the same time, the gas desorption law of coal was compared, and the gas adsorption promotion and desorption restrain effect of coal in low-temperature environ-ment
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Low-temperature oxidation characteristics of coals at the
2021年3月26日 The coupling disaster of coal spontaneous combustion and methane seriously threatens the safe production of coal mines. In order to study the low-temperature oxidation characteristics of coals oxidized at the methane-containing atmosphere, characteristics of free radicals and thermal effects of two coals oxidized at atmosphere containing different
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Effect of mechanical energy input during mechanical crushing on
2024年3月1日 Underground mining is usually simplified as a process of coal crushing and pulverization. However, this process is not purely ... its impact on the low-temperature endothermic and burnout stages was weak and exhibited no clear regularity. (2) Mechanical energy input resulted in lower temperatures for ignition, peak reaction ...
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