Migration and Redistribution of Sulfur Species during Chemical Looping Combustion of Coal with CuFe2O4 Combined Oxygen Carrier

Abstract

Chemical looping combustion (CLC) by direct use of coal as fuel has gained great recognition for the great advantage for CO2 capture, but sulfur occurrence and evolution in the CLC system is always a great concern. In order to gain a comprehensive insight into the migration and redistribution of various sulfur species in the CLC system, a typical Chinese coal (designated as LZ) with large size range around 180–400 μm (as frequently used in the real CLC system) was selected and its reaction with CuFe2O4 combined oxygen carrier (OC) was investigated using thermogravimetric analysis (TGA), which indicated that the reaction behavior of CuFe2O4 with LZ coal of large size changed greatly due to the maceral enrichment and mineral segregation in the LZ coal. At the two main reaction stages, the characteristic temperatures of CuFe2O4 reaction with LZ coal of large size range shifted to higher temperatures and the reaction rates increased relative to the reaction of CuFe2O4 with LZ coal of small size range (63–106 ...