DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5561

Title: Mineral-char interaction during gasification of high-ash coals in fluidized-bed gasification
Authors: Oboirien, BO
Engelbrecht, AD
North, BC
Eramus, RM
Falcon, R
Keywords: Mineral-char interaction
Coal gasification
Fluidised bed gasifiers
Issue Date: Sep-2011
Publisher: American Chemical Society
Citation: Oboirien, BO, Engelbrecht, AD, North, BC et al. 2011. Mineral-char interaction during gasification of high-ash coals in fluidized-bed gasification. Energy & Fuels, vol. 25(11), pp 5189-5199
Series/Report no.: Workflow;7885
Abstract: The mineral-char interaction can occur during the gasification of high-ash coals in fluidized-bed gasifiers when the melted minerals cover the char surface by penetrating into the cracks and pores of the char. In addition to the physical effects on char reactivity, the molten ash also appeared to participate in a chemical reaction at the char-mineral interface, which seems to have involved the modification of the carbon properties. A structurally more ordered part formed at the interaction interface and less in the unaffected part. To establish this fact, the mapping of two Raman parameters ID/IG versus IV/IG was used. This study sought to evaluate the impact of melted mineral on parts of the chars generated at 960C and 30 min in oxygen-enriched conditions, while X-ray spectroscopy [and energy-dispersive spectrometry (EDS)] mapping was used to determine the distribution of elements, such as Si, Al, Mg, Ca, and K, in the same chars. The higher ordered structure of the carbon around the melted minerals penetrating or surrounding carbon suggests a higher degree of interaction and modification of the local carbon by the minerals.
Description: Indexed with permission from Oboirien, BO, Engelbrecht, AD, North, BC et al. 2011. Mineral-char interaction during gasification of high-ash coals in fluidized-bed gasification. Energy & Fuels, vol. 25(11), pp 5189-5199. Copyright 2011 American Chemical Society
URI: http://pubs.acs.org/doi/full/10.1021/ef201056j
http://hdl.handle.net/10204/5561
ISSN: 0887-0624
Appears in Collections:General science, engineering & technology

Files in This Item:

File Description SizeFormat
Oboirien_2011.pdf3.88 MBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback