Journal ArticleDOI
Water absorption by coals: effects of pore structure and surface oxygen
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TLDR
In this paper, the water-holding capacity of various coals from lignite to anthracite was measured and its relation to their oxygen content and pore structure was investigated.About:
This article is published in Fuel.The article was published on 1986-02-01. It has received 112 citations till now. The article focuses on the topics: Absorption of water.read more
Citations
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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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A study of spontaneous combustion characteristics of a turkish lignite: particle size, moisture of coal, humidity of air
TL;DR: In this paper, the authors evaluated the spontaneous combustion characteristics of Askale lignite from Turkey using Crossing Point Methods adapted to our laboratories conditions, and determined the three predominant oxygen functional groups (carboxyl, hydroxyl and carbonyl) in untreated and moist coal samples with wet chemical methods.
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Moisture in coal: 2. Maceral effects on pore structure
TL;DR: In this paper, it was shown that although the total porosity and inherent moisture of coals are determined primarily by rank effects, systematic differences in pore size distribution between inertinite and vitrinite-rich coals exist.
Journal ArticleDOI
Study of Chemical Structure Changes of Chinese Lignite upon Drying in Superheated Steam, Microwave, and Hot Air
Arash Tahmasebi,Arash Tahmasebi,Jianglong Yu,Jianglong Yu,Yanna Han,Fengkui Yin,Sankar Bhattacharya,David Stokie +7 more
TL;DR: In this article, the Fourier transform infrared (FTIR) spectra of raw and dried lignite samples were curve-fitted to a series of bands in aliphatic hydrogen (3000-2800 cm-1) and carbonyl absorption (1850-1500 cm -1) zones.
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The effect of coal properties on the viscosity of coal–water slurries ☆
TL;DR: In this paper, the effect of coal properties on CWSs have been investigated using two Turkish coals of different ranks and a Siberian bituminous coal, and the results showed that coal-water slurries have a similar viscosity as water slurries.
References
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Journal ArticleDOI
The-brown coal/water system: Part 2. Water sorption isotherms on bed-moist Yallourn brown coal
D.J. Allardice,D.G. Evans +1 more
TL;DR: In this article, the water sorption isotherms of Victorian brown coals were used to study the effect of hydrogen bonding of the water to functional groups on the coal surface, and a mechanism for the hysteresis effect was proposed based on differences between the desorption and adsorption data.
Journal ArticleDOI
Low temperature oxidation of coals: Effects of pore structure and coal composition
TL;DR: The low-temperature oxidation of five coals, ranging in rank from subbituminous to anthracite, was studied in the temperature range 30 −250 °C, and the reaction kinetics were elucidated as discussed by the authors.
Journal ArticleDOI
The brown-coal/water system: Part 3. Thermal dewatering of brown coal
J.B. Murray,David G. Evans +1 more
TL;DR: In this article, the authors investigated the mechanism of a process for removing water as liquid from soft brown coals and found that the removal of liquid water is initiated principally by a disruption of the coal/water interactions caused by the thermal destruction of functional groups.
Journal ArticleDOI
Factors affecting the equilibrium moisture contents of low-rank coals
TL;DR: In this article, the equilibrium moisture contents of various low-rank coals have been determined at a constant humidity and have been related to the carboxyl and phenolic hydroxyl contents.
Journal ArticleDOI
Chemisorbed oxygen evolved as carbon dioxide and its influence on surface reactivity of carbons
TL;DR: The combined oxygen that decomposes to evolve carbon dioxide (termed tentatively as CO2-complex) appears to play a significant role in determining surface acidity, polarity, chemisorption of water and methanol, heat of immersion in water and selective adsorption from binary solutions as mentioned in this paper.
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The-brown coal/water system: Part 2. Water sorption isotherms on bed-moist Yallourn brown coal
D.J. Allardice,D.G. Evans +1 more