Journal ArticleDOI
Effects of drying upon lignite macro-pore structure
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In this paper, the effect of drying on the macro-and partly meso-pore structure of Greek lignite lumps was investigated under vacuum (∼0.2 Torr) in a constant-temperature (100 − 250 °C) environment.About:
This article is published in Powder Technology.The article was published on 1986-03-01. It has received 25 citations till now. The article focuses on the topics: Porosimetry & Specific surface area.read more
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A review on water in low rank coals: The existence, interaction with coal structure and effects on coal utilization
TL;DR: In this paper, a comprehensive overview on the fundamental understanding of water in brown coal and lignite, including the physical and chemical structure of coal, the forms of water present in low-rank coals, migration of water during drying, coal structure changes during moisture loss, moisture re-adsorption, and effects of water removal on subsequent applications including combustion, gasification and liquefaction are also summarized.
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Evolution lignite mesopore structure during drying. effect of temperature and heating time
TL;DR: The results of pore structure studies of Greek lignite are reported in this paper, where the pore volume and surface area were increased as the drying temperature was raised to 200°C and further drying up to 250°C, respectively.
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Spontaneous combustion of carbonaceous stockpiles. Part II. Factors affecting the rate of the low-temperature oxidation reaction
Myles A. Smith,David Glasser +1 more
TL;DR: In this article, the rate of low-temperature oxidation reaction was found to be critical in determining the relative tendency of a carbonaceous material to self heat and hence undergo spontaneous combustion.
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Effect of Drying Conditions on Moisture Re-Adsorption Performance of Dewatered Lignite
TL;DR: In order to improve the drying efficiency of lignite and restrain the moisture re-adsorption of dewatered coal, Wang et al. as discussed by the authors investigated the change in pore structure throughout the entire process.
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Spontaneous combustion of carbonaceous stockpiles. Part I: the relative importance of various intrinsic coal properties and properties of the reaction system
Myles A. Smith,David Glasser +1 more
TL;DR: In this article, the authors investigated a range of coal properties that were considered to be the most critical in terms of heat generation in a bulk coal medium, such as the heat capacity, the heat of reaction with oxygen and the activation energy for this reaction, were found to vary to a relatively minor degree for coals of varying rank and geological origin.
References
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Surface areas from mercury porosimeter measurements
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Evaluation of mercury porosimeter experiments using a network pore structure model
TL;DR: In this paper, a square network model was developed to interpret mercury penetration and retraction behavior in the widely employed mercury porosimetry technique for investigating pore structure and pore size distribution.
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Effects of drying and oxidation on coal pore structure
TL;DR: In this paper, pore volume distributions and surface areas were measured by mercury intrusion porosimetry for seven coals of different rank and source location, with little additional change during subsequent moderate temperature (<300/degree/C) oxidation.
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Macro-pore structure characteristics of a low-rank coal and its froth flotation fractions
TL;DR: In this paper, a high pressure Mercury Porosimeter (M.P) and an optical microscope interfaced with a Quantimct image analyser were employed to investigate the internal macro-pore structure of froth flotation concentrates of low-rank coal.
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Changes in the physical structure of coal on partial solubilization
TL;DR: In this paper, changes in the physical structure of Alberta hvCb coal upon partial solubilization in tetralin, Athabasca bitumen and the oil fraction from the bitumen were determined from gas adsorption measurements, mercury porosimetry and petrographic examination.