Abstract
The exact characteristics of the pyrolysis and combustion kinetics for Siberian bituminous coals and lignites were studied for better understanding of the fuel conversion processes. The bituminous coal samples of Kuznetskiy deposit and lignite samples of Kansko-Achinsk deposit were investigated in argon and in argon/air gas mixtures. The pyrolysis and oxidation experiments were executed at four heating rates (5, 10, 20 and 30 °C/min) under TG/DSC analyses coupled with mass-spectrometry. The activation energy for bituminous coal and lignite samples was decreased with conversion degree during oxidation. The combustion products of highest oxidation degree (CO2 and H2O) were dominated in gases released in oxidizing atmosphere. Contrariwise, activation energy was increased during pyrolysis with high content of CO, CO2, H2O, CH4, and H2 in released gases. The two isoconversional models were applied to determine the activation energy dependence on fuel samples conversion: Starink model and Ozawa iterative procedure. The mean arithmetic values of the resulted activation energy were 60 kJ/mole and 400 kJ/mole for oxidation and pyrolysis processes, respectively. These values are in good agreement with the results, presented previously for the other coals. The Starink model showed higher accuracy and lower activation energy values. The heating rate by non-isothermal oxidation and pyrolysis had the significant influence on the reaction rate because of evolution processes of the reactive surface and pore structure of the coal samples.
| Original language | English |
|---|---|
| Pages (from-to) | 383-392 |
| Number of pages | 10 |
| Journal | Fuel |
| Volume | 191 |
| DOIs | |
| Publication status | Published - 1 Mar 2017 |
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Keywords
- Activation energy
- Coal
- Isoconversional model
- Non-isothermal kinetics
- Siberian coal deposit
- Thermogravimetry
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry
Cite this
Non-isothermal kinetic study of bituminous coal and lignite conversion in air and in argon/air mixtures. / Slyusarskiy, Konstantin Vitalievich; Larionov, Kirill Borisovich; Osipov, Vitaliy Igorevich; Yankovsky, Stanislav Alexandrovich; Gubin, Vladimir Evgenievich; Gromov, Alexander Alexandrovich.
In: Fuel, Vol. 191, 01.03.2017, p. 383-392.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Non-isothermal kinetic study of bituminous coal and lignite conversion in air and in argon/air mixtures
AU - Slyusarskiy, Konstantin Vitalievich
AU - Larionov, Kirill Borisovich
AU - Osipov, Vitaliy Igorevich
AU - Yankovsky, Stanislav Alexandrovich
AU - Gubin, Vladimir Evgenievich
AU - Gromov, Alexander Alexandrovich
PY - 2017/3/1
Y1 - 2017/3/1
N2 - The exact characteristics of the pyrolysis and combustion kinetics for Siberian bituminous coals and lignites were studied for better understanding of the fuel conversion processes. The bituminous coal samples of Kuznetskiy deposit and lignite samples of Kansko-Achinsk deposit were investigated in argon and in argon/air gas mixtures. The pyrolysis and oxidation experiments were executed at four heating rates (5, 10, 20 and 30 °C/min) under TG/DSC analyses coupled with mass-spectrometry. The activation energy for bituminous coal and lignite samples was decreased with conversion degree during oxidation. The combustion products of highest oxidation degree (CO2 and H2O) were dominated in gases released in oxidizing atmosphere. Contrariwise, activation energy was increased during pyrolysis with high content of CO, CO2, H2O, CH4, and H2 in released gases. The two isoconversional models were applied to determine the activation energy dependence on fuel samples conversion: Starink model and Ozawa iterative procedure. The mean arithmetic values of the resulted activation energy were 60 kJ/mole and 400 kJ/mole for oxidation and pyrolysis processes, respectively. These values are in good agreement with the results, presented previously for the other coals. The Starink model showed higher accuracy and lower activation energy values. The heating rate by non-isothermal oxidation and pyrolysis had the significant influence on the reaction rate because of evolution processes of the reactive surface and pore structure of the coal samples.
AB - The exact characteristics of the pyrolysis and combustion kinetics for Siberian bituminous coals and lignites were studied for better understanding of the fuel conversion processes. The bituminous coal samples of Kuznetskiy deposit and lignite samples of Kansko-Achinsk deposit were investigated in argon and in argon/air gas mixtures. The pyrolysis and oxidation experiments were executed at four heating rates (5, 10, 20 and 30 °C/min) under TG/DSC analyses coupled with mass-spectrometry. The activation energy for bituminous coal and lignite samples was decreased with conversion degree during oxidation. The combustion products of highest oxidation degree (CO2 and H2O) were dominated in gases released in oxidizing atmosphere. Contrariwise, activation energy was increased during pyrolysis with high content of CO, CO2, H2O, CH4, and H2 in released gases. The two isoconversional models were applied to determine the activation energy dependence on fuel samples conversion: Starink model and Ozawa iterative procedure. The mean arithmetic values of the resulted activation energy were 60 kJ/mole and 400 kJ/mole for oxidation and pyrolysis processes, respectively. These values are in good agreement with the results, presented previously for the other coals. The Starink model showed higher accuracy and lower activation energy values. The heating rate by non-isothermal oxidation and pyrolysis had the significant influence on the reaction rate because of evolution processes of the reactive surface and pore structure of the coal samples.
KW - Activation energy
KW - Coal
KW - Isoconversional model
KW - Non-isothermal kinetics
KW - Siberian coal deposit
KW - Thermogravimetry
UR - http://www.scopus.com/inward/record.url?scp=85000399130&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85000399130&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2016.11.087
DO - 10.1016/j.fuel.2016.11.087
M3 - Article
VL - 191
SP - 383
EP - 392
JO - Fuel
JF - Fuel
SN - 0016-2361
ER -