O2/CO2 combustion is one of the processes to remove SO2 from pulverized-coal fired boiler.In this paper

SO2 emission and removal in O2/CO2 combustion were investigated in a fixed bed reactor and a drop tube reactor. The results indicated that the amount of SO2 emission was much less than conventional air combustion due to the presence of both homogeneous desulphurization and heterogeneous desulphurization in O2/CO2 combustion.Experimental study also suggested that the change of flue gas composition led to the difference of sulphur oxidation degree and the sulphur in coal could be released in different speciations and SO2 is only one of them.In O2/CO2 atmosphere

the desulphurization agent in coal itself showed different desulphurization behaviour comparing with that in air combustion; the desulphurization agent had an optimized microstructure which was beneficial not only for the improvement of the desulphurization efficiency but also for the adsorption of sulphur in the bottom ash.The kinetics calculation results also verified the above mechanism.