Pressurized Pyrolysis Characteristics of Two Ranks of Coal in a Thermogravimetric Analyzer
Publication: Journal of Energy Engineering
Volume 143, Issue 5
Abstract
An enhanced understanding of the pressurized pyrolysis process is of great importance for advanced coal utilization technologies. In this study, a nonisothermal thermogravimetric analysis was conducted to investigate the pyrolysis characteristics of two different ranks of coal. The samples were heated at a constant heating rate of up to 900°C under the pressures varying from atmospheric to 2 MPa (20 bars). Experimental results show that the pressurized conditions cause a reduction in devolatilization rates at temperatures above 400°C, and total volatile yields at the final temperature decrease by 12–18% with increasing pressure up to 2 MPa (20 bars). With regard to the ranks of coal investigated, devolatilization processes of bituminous coal are more strongly influenced by pressure conditions than those of subbituminous coal. Two kinds of global th-order reaction models were used to predict the thermal behavior of coal during the pressurized pyrolysis process, and a reasonable fit to the experimental data could be achieved for all the applied pressures.
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Published In
Journal of Energy Engineering
Volume 143 • Issue 5 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 24, 2016
Accepted: Jan 9, 2017
Published ahead of print: Mar 15, 2017
Published online: Mar 17, 2017
Discussion open until: Aug 17, 2017
Published in print: Oct 1, 2017
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