Pressurized oxy-fuel co-combustion of coal and biomass was studied to understand SO2 emissions and sulfur conversion. The researchers conducted experiments using lignite and corn straw at different conditions. They found that increasing biomass ratio reduced SO2 emissions, with the lowest sulfur conversion rate at 50% biomass. Higher pressure decreased SO2 emissions and promoted sulfur conversion to other forms. Higher temperature slightly increased SO2 emissions. Overall, the combustion experiments showed low slagging potential except for 100% biomass combustion.