Chemical looping combustion (CLC) typically employs a dual fluidized bed system (circulating fluidized bed process) where 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.
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), producing a flue gas composed primarily of carbon dioxide and water vapor; other trace pollutants depend on the fuel selected.
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... Chemical looping combustion (CLC) uses two or more reactions to perform the oxidation of hydrocarbon based fuels ... two redox reactions in traditional single stage combustion, the release of a fuel’s energy occurs in a highly irreversible manner - departing considerably from ... this allows a power station using CLC to approach the ideal work output for an internal combustion engine without exposing components to excessive working temperatures ...
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