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Physical properties and oxidation rates of chars from three bituminous coals

Sahu, Ranajit and Levendis, Yiannis A. and Flagan, Richard C. and Gavalas, George R. (1988) Physical properties and oxidation rates of chars from three bituminous coals. Fuel, 67 (2). pp. 275-283. ISSN 0016-2361 . http://resolver.caltech.edu/CaltechAUTHORS:20151104-101722148

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Abstract

Intrinsic oxidation rates of coal chars derived from three different bituminous coals were measured at 500 °C and the effects of char formation temperature, conversion, coal particle size and char particle size on the rates were evaluated. Characterization of the various samples including BET surface areas, mercury porosimetry, mercury and helium densities, heating values and in some cases elemental analyses were carried out to better understand the roles and interactions of the various parameters. Optical microscopy observations were also made to verify assumptions wherever possible. The results show that apparent and intrinsic rates as well as the heating values are reduced with increasing char formation temperature. N_2-BET surface areas increase an order of magnitude with conversion and exhibit maxima in the range of temperatures considered (1000 K to 1600 K). Of similar sized chars derived from different sizes of coal particles, those from the smaller coal size fractions had higher apparent reaction rates.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-2361(88)90276-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0016236188902761PublisherArticle
ORCID:
AuthorORCID
Flagan, Richard C.0000-0001-5690-770X
Additional Information:© 1988 Butterworth & Co. (Publishers) Ltd. Received 19 June 1987; revised 21 September 1987. This work was supported by the US Department of Energy under contract DE-AC2284FC70915. Thanks are due to Mr P. S. Northrop for help in constructing the BET apparatus and carrying out some surface area measurements.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC2284FC70915
Subject Keywords:char; oxidation; physical behaviour
Record Number:CaltechAUTHORS:20151104-101722148
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20151104-101722148
Official Citation:Ranajit Sahu, Yiannis A. Levendis, Richard C. Flagan, George R. Gavalas, Physical properties and oxidation rates of chars from three bituminous coals, Fuel, Volume 67, Issue 2, February 1988, Pages 275-283, ISSN 0016-2361, http://dx.doi.org/10.1016/0016-2361(88)90276-1. (http://www.sciencedirect.com/science/article/pii/0016236188902761)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61814
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:04 Nov 2015 19:26
Last Modified:04 Nov 2015 19:26

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