288634 COAL Direct Chemical Looping Process: Metallurigical Coke and PRB COAL Conversions

Monday, October 29, 2012: 3:34 PM
Conference C (Omni )
L. S. Fan, William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH

As a novel oxy-combustion approach for CO2 capture from coal power plants, the chemical looping processes have been extensively studied. The chemical looping process can easily extract highly concentrated CO2 and efficiently recover heat, which has exhibited the promising economic and technical feasibility to capture CO2 from the coal conversion processes.

At the Ohio State University, Coal-Direct Chemical Looping (CDCL) process using iron-based oxygen carriers has been developed for the application to the power generation with in-situ CO2 capture. The iron-based oxygen carrier particles can undergo extensive characteristic and performance tests for the application in the chemical looping processes. These oxygen carrier particles are consisted of reactive metal oxides, Fe2O3 and inert supports. The study of particular oxygen carrier particle shows that the particle can be regenerable under reduction-oxidation conditions for more than 100 cycles. Also, these particles are capable to convert various fuels such as methane, syngas and solid fuels to generate hydrogen and/or heat. In this study, a 2.5 kWth bench unit and a 25 kWth sub-pilot demonstration unit for the CDCL process are presented. Design, construction and operation of CDCL sub-pilot unit are discussed. The sub-pilot unit was successfully operated in the integrated and continuous manner with different types of solid fuels such as metallurgical coke and PRB coal.


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