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Oxidation of bituminous coal. 1. Expansion pressure

Oxidation of bituminous coal. 1. Expansion pressure Experiments show that the oxidation of bituminous coal from the Zasyad’ko mine at 60°C in laboratory conditions increases its expansion pressure from 5.2 to 30.0 kPa in ~28.3 days. Oxidation occurs in stages, as already demonstrated for Ukrainian and imported coal of different metamorphic stages on oxidation in the laboratory and in industrial trials at other temperatures. The rate constant in the initial stage of oxidation is 0.4095 × 10–4 min–1 at 60°C and 3.8479 × 10–4 min–1 at 140°C. That indicates sharp increase in oxidation rate between 60 and 140°C. In oxidation, the actual coal density, the atomic ratio H/C, and the number of hydrocarbon rings per carbon atom decline, while the molar volume per g-atom of carbon increases. Saturation of the bituminous coal with oxygen on oxidation increases the viscosity of the plastic mass that forms and increases the volume of gas and vapor products. Ultimately, that results in increase in the expansion pressure as the coal is oxidized. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Coke and Chemistry Springer Journals

Oxidation of bituminous coal. 1. Expansion pressure

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References (24)

Publisher
Springer Journals
Copyright
Copyright © 2015 by Allerton Press, Inc.
Subject
Chemistry; Industrial Chemistry/Chemical Engineering
ISSN
1068-364X
eISSN
1934-8398
DOI
10.3103/S1068364X15100051
Publisher site
See Article on Publisher Site

Abstract

Experiments show that the oxidation of bituminous coal from the Zasyad’ko mine at 60°C in laboratory conditions increases its expansion pressure from 5.2 to 30.0 kPa in ~28.3 days. Oxidation occurs in stages, as already demonstrated for Ukrainian and imported coal of different metamorphic stages on oxidation in the laboratory and in industrial trials at other temperatures. The rate constant in the initial stage of oxidation is 0.4095 × 10–4 min–1 at 60°C and 3.8479 × 10–4 min–1 at 140°C. That indicates sharp increase in oxidation rate between 60 and 140°C. In oxidation, the actual coal density, the atomic ratio H/C, and the number of hydrocarbon rings per carbon atom decline, while the molar volume per g-atom of carbon increases. Saturation of the bituminous coal with oxygen on oxidation increases the viscosity of the plastic mass that forms and increases the volume of gas and vapor products. Ultimately, that results in increase in the expansion pressure as the coal is oxidized.

Journal

Coke and ChemistrySpringer Journals

Published: Jan 27, 2016

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