DOI: 10.1080/00102202.2022.2142044 Corpus ID: 253435666; Study on the Influence of the Mechanical Crushing Process on Low-Temperature Oxidation Characteristics of Coal Samples
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The result can indirectly verify whether coal crushing is an important source of CO generation. ... Therefore, taking low metamorphic coal as the main research object, the CO gas production characteristics of different coal samples at low temperatures were determined through temperature-programmed experiments. It was found that the CO …
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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-temperature degrees and corresponding working conditions of ashers, and this could lead to two adverse effects without proper …
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Underground mining is usually simplified as a process of coal crushing and pulverization. However, this process is not purely physical. ... In comparison, 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 ...
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They found that the processes of crushing and grinding could cause fracture of covalent bonds in the macromolecular structure, generating large amounts of hydrocarbon free radicals and oxygen-containing free radicals. ... ·OH is derived from the cracking of ·OOH, which is a key product in the coal low-temperature oxidation chain …
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This study focuses on the mechanism of gas (such as CO and CO 2) generation during low-temperature oxidation of coal to provide a better understanding …
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And Indian coal, with its high ash content, ignites at a relatively low temperature, 122 degrees Fahrenheit. Coal seams burning at night in the state's Jharia coal region set off a ghostly, vermillion glow, releasing toxins including carbon dioxide, nitrogen oxides and volatile metals such as mercury. ... He says the crushing directly at …
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It is important to have an in-depth understanding of the relationship between coal functional group and mass changes during low-temperature oxidation.
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The theory holds that coal oxidation at low temperatures is due to the interaction of coal with O 2 in the air (physical adsorption, chemical adsorption, and chemical reaction). When the heat accumulates to the point that it cannot be released in time, the coal will combust spontaneously. ... In the process of coal crushing, a large number of ...
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The low temperature oxidization and high temperature combustion behaviors of raw coal and modified coal samples were studied with programmed …
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different coal types Yanpeng Chen1, Zhenyong Yin2,3, Fenjin Sun1, Hao Xu2,3, Jingjie Wu2,3 and Fangliang Fu2,3 Abstract Coal pyrolysis is the basis of coal gasification, as it is the necessary reaction step in the coal con-version process. To study the pyrolysis characteristics of different coal grades under temperature,
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As the particle size continuously decreases in the coal crushing process, the active groups on coal surfaces suffer from the joint action of crushing and oxidation. ... This paper presents an investigation into the evolution of the surface physical structure of different metamorphic coal during low-temperature oxidation. Specific surface area ...
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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), …
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Semantic Scholar extracted view of "Effect of mechanical energy input during mechanical crushing on the macrokinetics of the coal–oxygen reaction: A laboratory–scale study" by Xinlei Yang et al. ... Study on the Influence of the Mechanical Crushing Process on Low-Temperature Oxidation Characteristics of Coal Samples. Wanshu Hao Shujie …
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Learn everything you need to know about primary crushing, secondary crushing, and tertiary crushing in this comprehensive guide. Discover the types of crushers used in each stage, their working principles, and the advantages and disadvantages of each process. Get answers to frequently asked questions and improve …
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Which of these is not a method uses by utilities to reduce sulfur dioxide emission-burning low sulfur coal-crushing ans washing coal to remove sulfur-burning coal at high temp. to break down sulfur-employing flue gas scrubbers in smoke stacks which trap sulfur dioxide-all of these are current methods utilities are using to lower SO2 emissions.
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The crushing of generated CO is inversely proportional to moisture content in coal. •. CO production via ambient temperature oxidation is influenced by temperature, particle size and ventilation rate etc. •. Coal with rich aliphatic hydrocarbons and O …
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The effect of CO 2 curing and coal gangue on sulfate attack of cement paste at low temperature was investigated in this paper. The strength change, mass change and volume deformation were analyzed. In addition, pore structure, phase composition and microscopic morphology were tested by using MIP (mercury intrusion porosimeter), TG …
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By thermogravimetry (TG) experiments, evolution behaviors and properties of thermal oxidation processes at low temperature of a bituminous coal with five microscale particle sizes (L1 215.20 μm; L2 151.90 μm; L3 80.22 μm; L4 43.71 μm; and L5 19.21 μm) were investigated. A two-step reaction model was developed by using …
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So far, DME has been produced from a variety of feedstock including natural gas, crude oil, residual oil, coal, and waste products in the industry [22]. 5) Low extraction temperature and energy consumption. Almost all the current liquefied DME extraction processes are performed at low or room temperatures, which greatly reduces the …
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Shenmu (SM) subbituminous coal without caking property was treated by low-temperature rapid pyrolysis (LTRP) to modify its caking and coking properties. The treated samples were characterized by Fourier transform infrared spectrometry, vitrinite reflectance, and X-ray diffraction to determine the modification mechanism. Moreover, …
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DOI: 10.1016/J.JLP.2015.08.007 Corpus ID: 110923960; Sources of underground CO: Crushing and ambient temperature oxidation of coal @article{Tang2015SourcesOU, title={Sources of underground CO: Crushing and ambient temperature oxidation of coal}, author={Yibo Tang}, journal={Journal of Loss Prevention in The Process Industries}, …
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The effects of low temperature gradient on dynamic mechanical properties of coal were examined through Split-Hopkinson …
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A lab-scale experimental setup to simulate underground coal fires is established. • Natural convection of air is the primary driving force for the chemical reactions.. Temporal variation of surface thermal anomaly and CO/CO 2 emissions are studied.. Correlations between the coal temperature and other parameters are identified.
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The gases evolution during the low-temperature oxidation of coal is an essential parameter used to assess the state of coal oxidation and to estimate the …
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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. In this case, the coal ...
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Four coal samples with different metamorphic degrees were selected in this paper. The proximate analysis of coal samples is shown in Table 1.They were collected respectively from Wulan coal mine in Inner Mongolia, labeled as WL, Kouzidong coal mine and Yuandian coal mine in Anhui Province, labeled as KZD and YD, and Qincheng coal …
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Additionally, with the aid of a self-built experimental system for coal oxidation, the low-temperature oxidation of crushed coal of different particle sizes was studied, …
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Based on the second derivative of the oxygen concentration, a novel method was proposed to determine the critical and cracking temperatures of coal during low …
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Based on the method of opening closed pores through step-by-step crushing, this study investigated the pore structure of thermally-treated bituminous coal during crushing using low-field nuclear ...
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3.5. Stage Characteristics of Carbon Oxide at Low-Temperature Oxidation of Coal. By summarizing the experimental and simulation results above, we come up with the characteristics of generating carbon oxide at low-temperature oxidation stages of coal, as shown in Figure 8. We divide low-temperature oxidation of coal into four steps.
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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 …
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These oxygen-containing functional groups can accelerate the low-temperature oxidation process of coal in the subsequent secondary low-temperature …
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Based on the second derivative of the oxygen concentration, a novel method was proposed to determine the critical and cracking temperatures of coal during low …
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The CSC propensity has been proofed to increase with decreasing coal rank in general. Tang [69] observed that the low-rank lignite was oxidized to produce CO at 25 • C, while the high-rank ...
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In this paper, the morphological changes of organic sulfur in coal during low-temperature oxidation were studied first, and then the changes of organic sulfur forms in coal before and after low ...
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Other processing methods can include crushing and grinding the coal to make it suitable for burning or other uses, as well as processes to remove sulfur and other pollutants from the coal. ... Sub-bituminous coal can form at temperatures as low as 35 to 80 °C (95 to 176 °F), while anthracite requires a temperature of at least 180 to 245 °C ...
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Case study on the application of low-temperature plasma integration technology for the treatment mercury-containing waste gas from the crushing process of waste fluorescent lamps. Feng Qinzhong 1,2, Chen ... Liu R., Zhao J. et al. 2020 Current situation and prospect of mercury removal technology from bituminous coal flue gas …
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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 …
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Aiming at the problem that the coal seam temperature is high and the gas desorption rate is fast, the gas content loss is estimated to be biased, resulting in inaccurate measurement of coal seam gas content. This paper proposes a method for taking the coal samples at low temperature (below 0 °C) in order to improve the accuracy of gas …
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