International Journal of Earth Sciences and Engineering

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Thermogravimetric and Kinetic Analysis on Pyrolysis and Combustion of Oil Shale Under Different Oxygen Concentration Atmosphere


Affiliations
1 College of Construction Engineering, Jilin University, Changchun-130021, China
2 Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun-130021, China
3 Geology Department, School of Mines, University of Zambia, Lusaka-10101, Zambia
 

The kinetics of combustion of oil shale by different oxygen contents(11,21,42 and 63% Vol.) has been investigated by thermogravimetric analyzer (TGA) at three different heating rates (10,30 and 50°C/min). The Activation energy E of oil shale thermal decomposition under different oxygen concentrations were determined by iso-conversional method (Kissinger-Akahira-Sunose (KAS) method and Flynn–Wall-Ozawa (FWO) method). The data obtained from TG was used to calculate the Activation energy and discuss the influence of oxygen concentration on kinetic parameters. According to the TG results, the combustion process of oil shale could be divided into three stages, the evaporation of water, the combustion of the decomposition of organic matter and combustion of semicoke. The TG revealed that the oxygen content in atmosphere does not affect the evaporation stage but influence the combustion stage. The results show that the average activation energies were 134.85, 163.41, 211.19 and 242.32 KJ/mol. Activation energy using KAS method were 136.50, 167.37, 216.49 and 225.38 KJ/mol, whereas the FWO method at different oxygen contents were: 11,21,42, 63 vol%,respectively. The results of kinetic calculation revealed that the activation energy values of the combustion increase with increase of oxygen content.

Keywords

Oil Shale, Kinetics, Combustion, Oxygen Content, Thermogravimetric Analysis (TGA).
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  • Thermogravimetric and Kinetic Analysis on Pyrolysis and Combustion of Oil Shale Under Different Oxygen Concentration Atmosphere

Abstract Views: 224  |  PDF Views: 127

Authors

G. Roland Nguimbi
College of Construction Engineering, Jilin University, Changchun-130021, China
You-Hong Sun
Key Laboratory of Ministry of Land and Resources on Complicated Conditions Drilling Technology, Jilin University, Changchun-130021, China
Mingyi Guo
College of Construction Engineering, Jilin University, Changchun-130021, China
Han Jing
College of Construction Engineering, Jilin University, Changchun-130021, China
Phiricryton
Geology Department, School of Mines, University of Zambia, Lusaka-10101, Zambia

Abstract


The kinetics of combustion of oil shale by different oxygen contents(11,21,42 and 63% Vol.) has been investigated by thermogravimetric analyzer (TGA) at three different heating rates (10,30 and 50°C/min). The Activation energy E of oil shale thermal decomposition under different oxygen concentrations were determined by iso-conversional method (Kissinger-Akahira-Sunose (KAS) method and Flynn–Wall-Ozawa (FWO) method). The data obtained from TG was used to calculate the Activation energy and discuss the influence of oxygen concentration on kinetic parameters. According to the TG results, the combustion process of oil shale could be divided into three stages, the evaporation of water, the combustion of the decomposition of organic matter and combustion of semicoke. The TG revealed that the oxygen content in atmosphere does not affect the evaporation stage but influence the combustion stage. The results show that the average activation energies were 134.85, 163.41, 211.19 and 242.32 KJ/mol. Activation energy using KAS method were 136.50, 167.37, 216.49 and 225.38 KJ/mol, whereas the FWO method at different oxygen contents were: 11,21,42, 63 vol%,respectively. The results of kinetic calculation revealed that the activation energy values of the combustion increase with increase of oxygen content.

Keywords


Oil Shale, Kinetics, Combustion, Oxygen Content, Thermogravimetric Analysis (TGA).