期刊
JOURNAL OF THE ENERGY INSTITUTE
卷 91, 期 2, 页码 311-322出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.joei.2016.11.004
关键词
Lignite; Oxy-fuel; Combustion; Thermogravimetry; Kinetics
资金
- TUBITAK-MRC Energy Institute
- Istanbul Technical University Institute of Science Engineering and Technology Chemical Engineering Department
The air and oxy-fuel combustion processes of two low-grade lignite coals were investigated by thermogravimetric analysis (TGA) method. Coals were provided from two different coal mines in the Aegean region of Turkey. Oxy-fuel combustion experiments were carried out with three different gas mixtures of 21%02-79% CO2; 40% O-2-60% CO2 and 50% 02-50% CO2 at 950 degrees C and heating rates of 10 degrees C/min, 20 degrees C/min and 40 degrees C/min. The kinetics of the oxy-fuel combustion of coals were studied by using four different methods namely, Coats-Redfern (model-fitting method), Friedman (FR), Flynn-Wall-Ozawa's (FWO) and Kissinger-Akahira-Sunose's (KAS) methods. The apparent activation energies of combustion process calculated by FWO method are slightly but systematically higher than that calculated by the KAS and FR methods for the oxy-fuel atmospheres. Combustion behavior of both coals in the oxy-fuel combustion environment could vary significantly, likely due to their characteristics such ash and volatile matter contents. (C) 2016 Energy Institute. Published by Elsevier Ltd. All rights reserved.
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