Thermogravimetric determination of the carbon dioxide reactivity of char from some New Zealand coals and its association with the inorganic geochemistry of the parent coal

Beamish, BB, Shaw, KJ, Rodgers, KA and Newman, J (1998) Thermogravimetric determination of the carbon dioxide reactivity of char from some New Zealand coals and its association with the inorganic geochemistry of the parent coal. Fuel Processing Technology, 53 3: 243-253. doi:10.1016/S0378-3820(97)00073-8


Author Beamish, BB
Shaw, KJ
Rodgers, KA
Newman, J
Title Thermogravimetric determination of the carbon dioxide reactivity of char from some New Zealand coals and its association with the inorganic geochemistry of the parent coal
Journal name Fuel Processing Technology   Check publisher's open access policy
ISSN 0378-3820
Publication date 1998-01-01
Sub-type Article (original research)
DOI 10.1016/S0378-3820(97)00073-8
Open Access Status Not yet assessed
Volume 53
Issue 3
Start page 243
End page 253
Total pages 11
Publisher Elsevier BV
Language eng
Abstract Thermogravimetrically-determined carbon dioxide reactivities of chars formed from New Zealand coals, ranging in rank from lignite to high volatile bituminous, vary from 0.12 to 10.63 mg/h/mg on a dry, ash-free basis. The lowest rank subbituminous coal chars have similar reactivities to the lignite coal chars. Calcium content of the char shows the strongest correlation with reactivity, which increases as the calcium content increases. High calcium per se does not directly imply a high char reactivity. Organically-bound calcium catalyses the conversion of carbon to carbon monoxide in the presence of carbon dioxide, whereas calcium present as discrete minerals in the coal matrix, e.g., calcite, fails to significantly affect reactivity. Catalytic effects of magnesium, iron, sodium and phosphorous are not as obvious, but can be recognised for individual chars. The thermogravimetric technique provides a fast, reliable analysis that is able to distinguish char reactivity differences between coals, which may be due to any of the above effects. Published by Elsevier Science B.V.
Keyword Chemistry, Applied
Energy & Fuels
Engineering, Chemical
Coal
Char Reactivity
Thermogravimetry
Calcium Catalysis
Heat-treated Coals
Gasification
Lithotypes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Mon, 13 Aug 2007, 20:22:52 EST