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Comparative Study of the Effect of Different Coal Fly Ashes on the Performance of Oxygen Carriers for Chemical Looping Combustion

The application of chemical looping combustion (CLC) to solid fuels for the purpose of electric power generation from coal is the focus of research at the Center for Applied Energy Research (CAER), University of Kentucky, Lexington, KY. One important aspect for the use of CLC for solid fuels is the effect of ash on the capacity and reactivity of the oxygen carrier (OC). Four different coal-derived fly ashes obtained from electric power plants were used to study the effect of the ash on the ability of an OC to oxidize the carbon in a beneficiated gasification coal char containing 58.9% carbon. The four coal ashes were obtained from the following sources representing different coal ranks: sub-bituminous (Bulgaria), bituminous (China), Texas lignite (U.S.A.), and Powder River Basin sub-bituminous (U.S.A.). The OC was 50% Fe2O3 on an Al2O3 support. The OC was made by freeze granulation (FG) at the CAER. Mixtures of char/OC/ash with increasing ash contents to 75% were tested in a thermal analyzer coupled to a ...

Authors:   Aurora Rubel; Yi Zhang; James K. Neathery; Kunlei Liu
Journal:   Energy & Fuels
Year:   2012
DOI:   10.1021/ef201790m
Publication date:   27-Jan-2012
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