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Open AccessReview

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