— Coal is the largest non-renewable energy as well as an important basic energy and industrial raw material. Thus, correctly understanding the molecular structure characteristics of coal has important theoretical value for realizing carbon neutralization. In this work, we clarified the molecular structure characteristics of anthracite, where the …
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DOI: 10.1016/0166-5162(93)90029-A Corpus ID: 129446288; The role of shear strain in the graphitization of a high-volatile bituminous and an anthracitic coal @article{Wilks1993TheRO, title={The role of shear strain in the graphitization of a high-volatile bituminous and an anthracitic coal}, author={Kenneth R. Wilks and Maria …
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— The properties and structure of anthracitic coals through to meta-anthracites were examined using a variety of analytical methods.With increasing rank, the following increased as well: moisture content, carbon content, vitrinite reflectance, reflectance anisotropy, microhardness, real and apparent density, whereas volatile matter content, …
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: The damage evolution of coal is accompanied by the generation of acoustic 14 emission (AE) signal. Through the analysis and research of AE response 15 characteristics of coal deformation and failure, it is helpful to reveal the initiation, 16 propagation and fracture evolution of micro cracks in coal. In this work, taking the 17 anthracite coal as research …
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Anthracite Coal is a premium type of coal. It is very hard and compact. It is considered the highest quality of coal. It has the least amount of impurities, giving it the name "Clean Coal." Anthracite coal has no soot residue and produces no smoke when consumed. Bituminous Coal is a "soft coal" that contains tar-like particles within ...
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101 coal was first cut into a 102 mm×51 mm×51 mm cuboid using a rock cutting machine, 102 and then the six sides of the coal samples were polished by a double-end grinder. 103 Through polishing, the unevenness of the six sides of the coal samples is less than 104 0.01 mm. Finally, the standard coal samples used for uniaxial compression and AE
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A hard jet-black coal that burns slowly with a nonluminous flame giving out intense heat. Fixed carbon.... Click for pronunciations, examples sentences, video. TRANSLATOR. LANGUAGE. ... anthracitic (ˌænθrəˈsɪtɪk) or anthracitous (ˈænθrəˌsaitəs) adjective. Word origin [1810–15; prob. ‹ F ‹ L (Pliny) anthracītis kind of coal.
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— The average reservoir pressure of the #3 coal seam prior to CO 2 injection was 1241 kPa (180 psia) at a depth of 472 m. The absolute permeability of the coal seam prior to CO 2 injection was 12.6 milli-darcy (md), which was based on an effective permeability to gas of 1.8 md and a gas saturation of 40.8%.
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— The coalbed methane field has two major coal seams, an upper coal seam (#3) and a lower coal seam (#15), separated by about 100 m. They are both high rank anthracitic coals. A single-well micro-pilot test was performed at an existing well on coal seam #3, which is located at a depth of about 500 m in Shizhuang south block, South …
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— anthracite Form of coal consisting of more than 90% carbon, relatively hard, black, and with a metallic lustre. It burns with the hot pale-blue flame of complete combustion. It is the final form in the series of fuels: peat, lignite, bituminous coal, and …
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DOI: 10.1007/s13399-023-04584-0 Corpus ID: 259970159 (Co-) pyrolysis/steam gasification of Chinese herb residues and anthracitic coal: interaction effects, kinetic parameters, and products evaluation
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1. Introduction. With the coal resources gradually entering the deep mining stage, under the complex environment of "three-high and one-disturbance," the coal and rock are more prone to fracture and lose stability, leading to more dynamic disasters such as rockburst and coal and gas outburst [1 – 4].Moreover, in recent years, the coal-gas compound dynamic …
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There are four major types (or "ranks") of coal. Rank refers to steps in a slow, natural process called "coalification," during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material. The four ranks are:Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, …
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Anthracite coal is the most preferred coal for heating buildings and homes. It stands out for its high-quality heat and unique nature to burn in a manner that is efficient and clean. …
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— Coal is a sedimentary rock composed of both organic and inorganic materials. Coal is composed of macerals, discrete minerals, inorganic elements held molecularly by the organic matter, and water and gases contained in submicroscopic pores. Organically, coal consists primarily of carbon, hydrogen, and oxygen, and lesser amounts of sulfur …
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Anthracitic definition: Pertaining to, or composed of, anthracite . Dictionary Thesaurus Sentences ... in the combustion of small anthracitic coal, where a current of air from a fan-blower is sometimes blown under the grate to promote combustion. The proportion of this residue is greatest in the more anthracitic or drier coals, ...
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— The U.S. Department of Energy's Office of Scientific and Technical Information
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— Pennsylvania's hidden anthracite coal towns offer a unique glimpse into the past. These towns, rich in history, showcase the hard work and resilience of the …
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— Similar, Wang et al. [13] studied mechanical parameters and AE response characteristics of anthracitic coal samples in uniaxial compression experiments. Yin et al. [14] analyzed the damage and ...
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Anthracitic rank marks the beginning of distinctive physical and chemical changes to coal termed anthracitization, graphitization, metadiagenesis, and telodiagenesis in different reports (see figure). The most distinctive physical change at anthracite rank, is the development of conchoidal fracture and the loss of cleats in coal.
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overcome related issues, the sample of anthracitic coal (AC) from Shenmu country in Shaanxi Province, China, was investigated as the targeted coal to be blended with CHR. As presented in Table 1, the LHV for AC was high up to 25.470 MJ/kg, which could be served as the auxiliary fuel for more eciently disposing of CHR. The proximate analysis result
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