Journal ArticleDOI
Physicochemical properties and gasification reactivity of the ultrafine semi-char derived from a bench-scale fluidized bed gasifier
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In this paper, the physicochemical properties and gasification reactivity of the ultrafine semi-char, derived from a bench-scale fluidized bed gasifier, using Zhundong coal as fuel, were investigated.Abstract:
Zhundong coalfield is the largest intact coalfield worldwide and fluidized bed gasification has been considered as a promising way to achieve its clean and efficient utilization. The purpose of this study is to investigate the physicochemical properties and gasification reactivity of the ultrafine semi-char, derived from a bench-scale fluidized bed gasifier, using Zhundong coal as fuel. The results obtained are as follows. In comparison to the raw coal, the carbon and ash content of the semi-char increase after partial gasification, but the ash fusion temperatures of them show no significant difference. Particularly, 76.53% of the sodium in the feed coal has released to the gas phase after fluidized bed gasification. The chemical compositions of the semi-char are closely related to its particle size, attributable to the distinctly different natures of diverse elements. The semi-char exhibits a higher graphitization degree, higher BET surface area, and richer meso- and macropores, which results in superior gasification reactivity than the coal char. The chemical reactivity of the semi-char is significantly improved by an increased gasification temperature, which suggests the necessity of regasification of the semi-char at a higher temperature. Consequently, it will be considered feasible that these carbons in the semi-char from fluidized bed gasifiers are reclaimed and reused for the gasification process.read more
Citations
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Catalysts for gasification: a review
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Journal ArticleDOI
Ash Fusion Properties and Mineral Transformation Behavior of Gasified Semichar at High Temperature under Oxidizing Atmosphere
TL;DR: In this article, the ash fusion properties and mineral transformation behavior at high temperature of the semichar from an industrial circulating fluidized bed (CFB) gasifier were investigated under oxidizing condition.
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References
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Journal ArticleDOI
Reactivity of coal gasification with steam and CO2
Alejandro Molina,Fanor Mondragón +1 more
TL;DR: In this article, a description of the main parameters affecting char gasification, as well as an evaluation of the kinetic models used for describing the gasification reaction, are presented, and it is shown that the thermal history of the char, the pore structure and the coal chemical composition are those which present the most different results.
Journal ArticleDOI
The ash deposition mechanism in boilers burning Zhundong coal with high contents of sodium and calcium: A study from ash evaporating to condensing
TL;DR: In this paper, the authors investigated the ash deposition mechanism based on the results obtained from a full-scale boiler (350MW) burning Zhundong coal, and a fixed bed reactor used for ash evaporating-condensing.
Journal ArticleDOI
Syngas production through gasification and cleanup for downstream applications — Recent developments
TL;DR: In this article, various gasification technologies/gasifiers and syngas cleaning options are critically reviewed keeping in view various types of feedstocks and various downstream applications of synggas such as power generation, chemicals and hydrogen production, liquid fuels production and synthetic natural gas (SNG) production.
Journal ArticleDOI
Reactivities of 34 coals under steam gasification
TL;DR: 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.
Journal ArticleDOI
Geochemistry and mineralogy of coal in the recently explored Zhundong large coal field in the Junggar basin, Xinjiang province, China
TL;DR: The coal reserves of the Zhundong coalfield in Western China are of a high quality and are characterized by low ash, aluminum, iron, sulfur, and trace element contents as mentioned in this paper.
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