Journal ArticleDOI
Reactivities of 34 coals under steam gasification
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In this article, the effect of coal rank on the gasification rate of coal char was examined and it was concluded that the surface active sites and/or the amount of exchangeable Ca and Na control the reactivity of low-rank coal chars in H2O.About:
This article is published in Fuel.The article was published on 1985-10-01. It has received 236 citations till now. The article focuses on the topics: Carbochemistry & Char.read more
Citations
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Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review
TL;DR: In this paper, a brief review of the coal gasification with CO2 as a diluent is presented, where coal rank, pressure, temperature, gas composition, catalyst and the minerals present inside the coal, heating rate, particle size, and diverse reactor types.
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Some recent advances in the understanding of the pyrolysis and gasification behaviour of Victorian brown coal
TL;DR: A review of recent progress in the understanding of the pyrolysis and gasification behavior of Victorian brown coal can be found in this article, where a brief account of the effects of AAEM species on the pyrotechnic yields of brown coal is given.
Journal ArticleDOI
Numerical simulation of coal gasification in entrained flow coal gasifier
Hiroaki Watanabe,Maromu Otaka +1 more
TL;DR: In this article, a coal gasification model composed of a pyrolysis model, a char model, and a gas phase reaction model is proposed to evaluate the performance of an entrained flow coal gasifier.
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Gasification of a South Australian low-rank coal with carbon dioxide and steam: kinetics and reactivity studies
TL;DR: In this article, an experimental gasification study of Bowmans coal with steam and with carbon dioxide in a single-particle reactor operating at atmospheric pressure and at temperatures between 714 and 892°C was conducted.
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Factors affecting the reactivity of coal chars during gasification, and indices representing reactivity
TL;DR: In this paper, the authors reviewed literature data for the rate of gasification of coal chars with oxygen, CO2 and steam and clarified the factors controlling this process. But, they did not consider the effect of the number of active sites in the coal matrix.
References
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Journal ArticleDOI
A random pore model for fluid‐solid reactions: I. Isothermal, kinetic control
TL;DR: In this paper, a random pore model is developed for fluid-solid reactions, which allows for arbitrary pore size distributions in the reacting solid. But the model is not suitable for the case of gasification, and it cannot represent the behavior of a system that shows a maximum in reaction rate as well as one that does not.
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The importance of active surface area in the carbon-oxygen reaction1,2
TL;DR: In this article, the authors measured the coverage of the surface with oxygen complex upon exposure of the samples to O2 at 300 deg for 24 hours, and calculated the unoccupied active surface area of the oxidized samples.
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Reactivity of heat-treated coals in air at 500 °C
TL;DR: In this paper, the reactivity of lignite coal was measured by a gravimetric method and the results showed that lower-rank coal chars are more reactive than those prepared from high-rank coals.
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Reactivity of heat-treated coals in carbon dioxide at 900 °C
Edwin J. Hippo,Philip L. Walker +1 more
TL;DR: In this article, the reactivity of sixteen 40 × 100 mesh U.S. coals charred to 1000 °C were measured in carbon dioxide at 900 °C and showed that magnesium and calcium are important to char reactivity.
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Enhancement of lignite char reactivity to steam by cation addition
TL;DR: In this article, a raw lignite has been treated with HCl and HF to demineralize it and to increase its carboxyl content prior to exchanging selected cations with the hydrogen on the Carboxyl groups.