Chemical looping combustion of coal in a 5Â kWth interconnected fluidized bed reactor using hematite as oxygen carrier

A new configuration of interconnected fluidized bed for in-situ gasification chemical looping combustion (iG-CLC) was tested with Chinese bituminous coal as fuel and natural hematite as oxygen carrier. The thermal power of this unit was varied between 2.0 and 6.0 kWth. The total operation time was more than 100 h in the hot mode fed with coal. This natural hematite displayed high reactivity. The effect of operational parameters, such as the fuel reactor (FR) temperature and coal feeding rate on three factors - combustion efficiency, carbon capture efficiency and CO2 yield - were investigated. The results indicated this natural hematite was a good type of oxygen carrier.129