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Using Metal Carbonates to Intensify Coal Ignition and Combustion

Using Metal Carbonates to Intensify Coal Ignition and Combustion The use of metal carbonates to intensify coal ignition and combustion is considered. To coal powder (<0.1 mm fraction), 5 wt % admixtures of Na2CO3, K2CO3, CaCO3, MgCO3, and CuCO3 are introduced, by a mechanical method. The oxidation, ignition, and combustion of the mixtures is studied by thermal analysis and high-speed video recording in a combustion chamber with an atmospheric temperature of 700°C. The metal carbonates tend to increase the reactivity of the coal, as indicated by the increase in oxidation rate (established by thermal analysis), the heat liberation (according to differential scanning calorimetry), and the shorter delay in ignition and combustion (according to video data). The carbonates also result in more complete coal combustion and decrease the emissions of gaseous CO and NOx. In the later stages, combustion of the modified samples is accompanied by periodic microexplosions. The change in coal reactivity is greatest in the case of copper carbonate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Coke and Chemistry Springer Journals

Using Metal Carbonates to Intensify Coal Ignition and Combustion

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References (21)

Publisher
Springer Journals
Copyright
Copyright © Allerton Press, Inc. 2022. ISSN 1068-364X, Coke and Chemistry, 2022, Vol. 65, No. 5, pp. 167–173. © Allerton Press, Inc., 2022. Russian Text © The Author(s), 2022, published in Koks i Khimiya, 2022, No. 5, pp. 8–15.
ISSN
1068-364X
eISSN
1934-8398
DOI
10.3103/s1068364x22050039
Publisher site
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Abstract

The use of metal carbonates to intensify coal ignition and combustion is considered. To coal powder (<0.1 mm fraction), 5 wt % admixtures of Na2CO3, K2CO3, CaCO3, MgCO3, and CuCO3 are introduced, by a mechanical method. The oxidation, ignition, and combustion of the mixtures is studied by thermal analysis and high-speed video recording in a combustion chamber with an atmospheric temperature of 700°C. The metal carbonates tend to increase the reactivity of the coal, as indicated by the increase in oxidation rate (established by thermal analysis), the heat liberation (according to differential scanning calorimetry), and the shorter delay in ignition and combustion (according to video data). The carbonates also result in more complete coal combustion and decrease the emissions of gaseous CO and NOx. In the later stages, combustion of the modified samples is accompanied by periodic microexplosions. The change in coal reactivity is greatest in the case of copper carbonate.

Journal

Coke and Chemistry – Springer Journals

Published: May 1, 2022

Keywords: Keywords: coal; metal carbonates; activation; combustion; oxidation; ignition delay; incomplete combustion; gaseous products

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