Abstract
The possibility of using three natural Cu ore particles as oxygen carriers in the chemical looping with oxygen uncoupling (CLOU) was investigated. The reaction kinetics of Cu2O with O2 and the decomposition kinetics of CuO in a CO2 atmosphere at different temperatures and oxygen fractions were studied using thermogravimetric analysis (TGA). Both oxygen uptake and oxygen release exhibit a high reaction rate. Multiple oxygen uptake and oxygen release cycles indicated that three natural Cu ore oxygen carriers have high reactivity and cyclic stability. The high-temperature oxygen uptake and oxygen release process for producing O2–CO2 gas mixtures in a fluidized-bed reactor packed with Cu-based oxygen-carrier particles through air separation with carbon dioxide as the purge gas was investigated. Oxygen was absorbed, and heat is stored by the Cu-based oxygen-carrier particles with air being fed. An O2–CO2 stream can be obtained when the fluidized bed was regenerated with carbon dioxide as the fluidizing gas. Th...
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