Kinetics of coal char gasification with CO2: Impact of internal/external diffusion at high temperature and elevated pressure

Ryang-Gyoon Kim, Chan-Won Hwang and Chung-Hwan Jeon

Applied Energy, 2014, vol. 129, issue C, 299-307

Abstract: A pressurized wire-heating reactor (PWHR) that can provide experimental conditions up to pressures and temperatures of 50atm and 1750K, respectively, was developed to evaluate the intrinsic reaction kinetics of CO2 gasification for Berau sub-bituminous coal char (Indonesian coal) at elevated pressure using a synchronized experimental method. This synchronization system consists of a thermocouple wire for both heating and direct measurement of the particle temperature and a photodetector sensor for measuring the intensity of the luminous emission from the reaction particle to determine the ignition/burnout points. The intrinsic reaction kinetics obtained from PWHR, which was analyzed from nth order reaction rate equations, was verified by comparison with TGA results. The internal/external effectiveness factor was analyzed to determine the effects of high pressure (up to 30atm) and temperature (up to 1723K) on char-CO2 gasification. Accordingly, the intrinsic activation energies based on nth order reaction rate equation were determined to be 152kJ/mol (via TGA, 75μm char particle), 150kJ/mol (via TGA, 800μm char particle), and 149.2kJ/mol (via PWHR, 800μm char particle).

Keywords: Coal char; CO2 gasification; Kinetics; Reaction rate; Pressurized wire-heating reactor (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261914005029
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:129:y:2014:i:c:p:299-307

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2014.05.011

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().