Fig 1. Diagram of CLC reactor systemFig 2. (Left) Dual fluidized bed design, the Darmstadt chemical looping combustion pilot plant[1] and (Right) interconnected moving bed-fluidized bed design, the Ohio State University Coal Direct Chemical Looping pilot plant[2]
Chemical looping combustion (CLC) is a technological process typically employing a dual fluidized bed system. CLC operated with an interconnected moving bed with a fluidized bed system, has also been employed as a technology process. In CLC, a metal oxide is employed as a bed material providing the oxygen for combustion in the fuel reactor. The reduced metal is then transferred to the second bed (air reactor) and re-oxidized before being reintroduced back to the fuel reactor completing the loop. Fig 1 shows a simplified diagram of the CLC process. Fig 2 shows an example of a dual fluidized bed circulating reactor system and a moving bed-fluidized bed circulating reactor system.
Isolation of the fuel from air simplifies the number of chemical reactions in combustion. Employing oxygen without nitrogen and the trace gases found in air eliminates the primary source for the formation of nitrogen oxide (NOx), produces a flue gas composed primarily of carbon dioxide and water vapor; other trace pollutants depend on the fuel selected.
^Ströhle, Jochen; Orth, Matthias; Epple, Bernd (January 2014). "Design and operation of a 1MWth chemical looping plant". Applied Energy. 113: 1490–1495. doi:10.1016/j.apenergy.2013.09.008. ISSN 0306-2619.
^Liang-Shih, Fan. Chemical looping partial oxidation : gasification, reforming, and chemical syntheses. Cambridge. ISBN 9781108157841. OCLC 1011516037.
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