Chemical looping combustion (CLC) technique is one of the oxy-fuel combustion carbon capture techniques. A CLC process consists of a fuel reactor and an air reactor which are interconnected fluidized bed reactor. Oxygen carrier is reduced by fuel gas in a fuel reactor. Reduced oxygen carrier is transported to air reactor and oxidized by air and circulated between the two reactors repeatedly. In the CLC system, CO2 of high concentration can be obtained, in principle, by removing H2O in the gas stream emitted from the fuel reactor. In this study, we have conducted the experiment and interpreted reaction characteristics via observing weight change of Ni-based oxygen carrier using the TGA with varying gas concentration, temperature, and gas flow rate. The experiments were carried out at gas concentration of CH4 5~30%, CO2 bal. temperature range 800 to 900 °C and flow rate 50~150 sccm. We also adapted a basic redox kinetic model to interpret the oxygen transfer capacity and oxygen transfer rate of Ni-based oxygen carrier based on TGA test results.

Redox characteristics and kinetics of Ni-based oxygen carrier for chemical looping combustion (CLC)

251st National Meeting (2016)

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