Pressurised steam drying of Australian low-rank coals

Bongers, Geoff; Jackson, W. Roy; Woskoboenko, Fedir

doi:10.1016/s0378-3820(99)00070-3

Cited by 40 publications

(6 citation statements)

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“…For instance, when it is heated, thermal decomposition of carboxyl groups in Victorian brown coal may occur at temperatures as low as 150 °C . During drying, as water is progressively removed, the pore structure of the coal tends to collapse and shrinkage takes place , As a result of the binderless briquetting process, a significant reduction in pore volume occurs; in particular, the macropores collapse. Changes in physicochemical properties of Victorian brown coal during mechanical thermal expression (MTE) dewatering would affect the subsequent pyrolysis and gasification reactivity. − The coal reactivity under oxy-fuel conditions has also been studied experimentally in the literature .…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†

Li¹,

Rathnam²,

Yu³

et al. 2010

Energy Fuels

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Pyrolysis and combustion characteristics of an Indonesian low-rank coal are studied under oxy-fuel (O2/CO2) and air (O2/N2) conditions using a drop tube furnace (DTF) and a thermogravimetric analyzer (TGA). Raw coal, dried coal, and binderless briquette samples of the same coal were used in the experiments, and the effects of drying and binderless briquetting on the reactivity of the coal under different conditions were investigated. Chars were prepared in the DTF in both N2 and CO2 atmospheres in the temperature range of 800−1400 °C. The reactivity of chars under oxy-fuel and air conditions was analyzed in the TGA. The coal reactivity under oxy-fuel conditions differed from that under air combustion conditions. The temperature at which significant gasification of the coal and char took place in the concentrated CO2 gas stream was also identified. Characteristics of chars from different conditions were compared. Drying and briquetting had some noticeable influences on the reactivity of the coal under oxy-fuel conditions.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†

Li¹,

Rathnam²,

Yu³

et al. 2010

Energy Fuels

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show abstract

“…The polarity of C-O bond and lone pair electrons of oxygen atoms in CO 2 molecules result in the effortless adsorption on the lignite surface in spite of CO 2 being a nonpolar molecule and the replacement of moisture molecules by CO 2 . [12][13][14][15] It means that the CO 2 molecules are easier to enter into the internal pores of lignite and adsorbed on the active sites instead of H 2 O than Ar molecules. [16][17][18] Besides, CO 2 can absorb on the organic matrix and modify the physical and possible chemical structure of the coal matrix.…”

Section: Resultsmentioning

confidence: 99%

Effect of carbon dioxide on pore structure characteristics of dewatered lignite and the relevance to its moisture-adsorbing capacity

et al. 2015

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“…For coal pyrolysis processes other than coking, the isolation of coal predrying was also widely tested to show how it affects the yield and distribution of pyrolysis products, − while this pretreatment, on the other hand, is definitely needed in the view of reducing wastewater generation in pyrolysis. Figure presents the results obtained from testing the influence on pyrolysis product via thermally pretreating a kind of brown coal in helium at varied temperatures .…”

Section: Application To Pyrolysismentioning

confidence: 99%

Technical Review on Thermochemical Conversion Based on Decoupling for Solid Carbonaceous Fuels

Zhang

et al. 2013

Energy Fuels

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The thermochemical conversion process of solid fuels is explicitly shown as the processes of pyrolysis (including coking and carbonization), gasification, and combustion. These processes actually involve a similar complex reaction network. The so-called “decoupling” refers to the optimization approach of process performance through controlling the interactions between or among the involved individual reactions. Our previous article in Energy & Fuels (2010, 24, 6223–6232) has analyzed how the approach of decoupling applies to the gasification technologies and justified the realized effects from decoupling. This successive report is devoted to understanding the applications of decoupling to the other types of thermochemical conversion technologies (mainly including pyrolysis and combustion) so as to generalize the “decoupling” methodology for innovations of thermochemical conversion technologies. After a reiteration of the principle and implementation approaches (isolating and staging) for decoupling, reanalysis of the process design principle and its consequent technical superiorities based on decoupling is performed for a few well-known or emerging novel conversion technologies developed in the world. The concrete technologies exemplified and their realized beneficial effects include the high-efficiency advanced coal coking processes with moisture control or gentle pyrolysis of feedstock in advance, coal pyrolysis in multiple countercurrent reactors for producing high-quality tar, gasification of caking coal in fluidized bed through adopting jetting preoxidation of coal, low-NO x decoupling combustion of coal by developing the in-bed NO x reduction capabilities of pyrolysis gas and char, and coal topping combustion for the coproduction of tar and heat. These highlights further justified that the decoupling would be a viable technical choice for achieving one or more of the technical advantages among polygeneration, high efficiency, high product quality, wide fuel adaptability, low pollutant emissions in thermochemical conversions of solid carbonaceous fuels.

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Pressurised steam drying of Australian low-rank coals

Cited by 40 publications

References 10 publications

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†

Effect of carbon dioxide on pore structure characteristics of dewatered lignite and the relevance to its moisture-adsorbing capacity

Technical Review on Thermochemical Conversion Based on Decoupling for Solid Carbonaceous Fuels

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Pressurised steam drying of Australian low-rank coals

Cited by 40 publications

References 10 publications

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O2/N2and O2/CO2Conditions†

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O2/N2and O2/CO2Conditions†

Effect of carbon dioxide on pore structure characteristics of dewatered lignite and the relevance to its moisture-adsorbing capacity

Technical Review on Thermochemical Conversion Based on Decoupling for Solid Carbonaceous Fuels

Contact Info

Product

Resources

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Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†

Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O₂/N₂and O₂/CO₂Conditions^†