Chemical-Looping Combustion with Iron-Based Oxygen Carries

Experimental study was carried out for chemical-looping combustion of simulated gas with iron-based oxygen carriers in a fluidized bed.Experimental results show that high CO2 concentration can be obtained at initial reactions.The conversion of CO decreases first and increases thereafter with reduction/oxidization cyclic numbers,while the H2 conversion remains 100% during the whole process of experiments.The yield of CO2 gradually increases and finally remains constant with cyclic numbers.The reactivity of oxygen carriers is high during reduc-tion/oxidization cyclic reactions.With the increase of cyclic numbers,their reactivity increased and finally reaches maximum.The oxidization process is very important for the performance of oxygen carriers,and is thus essential for oxygen carriers to keep high reactivity.