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Energies 2015, 8(10), 10605-10635; doi:10.3390/en81010605

Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review

1
Department of Energy, National Energy Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA
2
AECOM, 626 Cochrans Mill Road, PO Box 10940, Pittsburgh, PA 15236, USA
3
Department of Energy, National Energy Technology Laboratory, 3610 Collins Ferry Road, Morgantown, WV 26507, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Vasily Novozhilov
Received: 24 July 2015 / Revised: 6 September 2015 / Accepted: 16 September 2015 / Published: 24 September 2015
(This article belongs to the Special Issue Recent Advances in Coal Combustion and Gasification)
View Full-Text   |   Download PDF [1471 KB, uploaded 24 September 2015]   |  

Abstract

Chemical-looping technology is one of the promising CO2 capture technologies. It generates a CO2 enriched flue gas, which will greatly benefit CO2 capture, utilization or sequestration. Both chemical-looping combustion (CLC) and chemical-looping gasification (CLG) have the potential to be used to generate power, chemicals, and liquid fuels. Chemical-looping is an oxygen transporting process using oxygen carriers. Recently, attention has focused on solid fuels such as coal. Coal chemical-looping reactions are more complicated than gaseous fuels due to coal properties (like mineral matter) and the complex reaction pathways involving solid fuels. The mineral matter/ash and sulfur in coal may affect the activity of oxygen carriers. Oxygen carriers are the key issue in chemical-looping processes. Thermogravimetric analysis (TGA) has been widely used for the development of oxygen carriers (e.g., oxide reactivity). Two proposed processes for the CLC of solid fuels are in-situ Gasification Chemical-Looping Combustion (iG-CLC) and Chemical-Looping with Oxygen Uncoupling (CLOU). The objectives of this review are to discuss various chemical-looping processes with coal, summarize TGA applications in oxygen carrier development, and outline the major challenges associated with coal chemical-looping in iG-CLC and CLOU. View Full-Text
Keywords: chemical-looping combustion; chemical-looping gasification; coal; solid fuels; oxygen-carriers; thermogravimetric analysis (TGA) chemical-looping combustion; chemical-looping gasification; coal; solid fuels; oxygen-carriers; thermogravimetric analysis (TGA)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, P.; Means, N.; Shekhawat, D.; Berry, D.; Massoudi, M. Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review. Energies 2015, 8, 10605-10635.

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