Thermogravimetric Analysis of Moisture Desorption from Coal
- Authors: Smirnov V.G.1, Manakov A.Y.2, Dyrdin V.V.1, Khitsova L.M.3, Mikhaylova E.S.3, Ismagilov Z.R.3
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Affiliations:
- Gorbachev Kuzbass State Technical University State Technical University
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch
- Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
- Issue: Vol 60, No 10 (2017)
- Pages: 375-379
- Section: Coal
- URL: https://journals.rcsi.science/1068-364X/article/view/226350
- DOI: https://doi.org/10.3103/S1068364X17100076
- ID: 226350
Cite item
Abstract
In coke production, the moisture content of the initial coal is an important parameter. The moisture present in the pores of coal changes the properties of the coking batch. Note also that, together with methane and/or carbon dioxide, water may form gaseous hydrates in the coal bed. In the present work, to study the state of the moisture in coal, attention focuses on eight samples of natural gas saturated to constant moisture content in an atmosphere where the relative partial pressure of water vapor is 91%. The moisture sorbed from the atmosphere has a U-shaped dependence on the metamorphic stage of the coal, with a minimum at coking coal (K coal). In similar conditions, the more mature T and A coal contains twice as much moisture as K coal, while the younger D and G coal contains about four times as much moisture. Thermogravimetric analysis of coal samples saturated to constant moisture content permits calculation of the rate of mass loss and activation energy for the evaporation of moisture in the heating of the given samples. For each coal sample, the temperature range where the evaporation of moisture may be described by a first-order Arrhenius equation is determined. The upper limit of this range is compared with the temperature corresponding to maximum rate of mass loss and also with the temperature corresponding to the maximum thermal effect.
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About the authors
V. G. Smirnov
Gorbachev Kuzbass State Technical University State Technical University
Author for correspondence.
Email: smirnovvg@kuzstu.ru
Russian Federation, Kemerovo
A. Yu. Manakov
Nikolaev Institute of Inorganic Chemistry, Siberian Branch
Email: smirnovvg@kuzstu.ru
Russian Federation, Novosibirsk
V. V. Dyrdin
Gorbachev Kuzbass State Technical University State Technical University
Email: smirnovvg@kuzstu.ru
Russian Federation, Kemerovo
L. M. Khitsova
Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Email: smirnovvg@kuzstu.ru
Russian Federation, Kemerovo
E. S. Mikhaylova
Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Email: smirnovvg@kuzstu.ru
Russian Federation, Kemerovo
Z. R. Ismagilov
Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Email: smirnovvg@kuzstu.ru
Russian Federation, Kemerovo