Pressurized oxy-fuel combustion is a solution to achieve low-cost CO 2 capture and higher operating efficiency. The combination of pressurized oxy-fuel combustion technology and biomass combustion technology can achieve negative CO 2 emissions. However, pressurized oxy-fuel co-combustion of coal and biomass lacks mechanism understanding and the studies on pollutant emissions are scarce. To investigate SO 2 emission concentration, the conversion rate of fuel sulfur to SO 2 , sulfur mass balance, and sulfur content and forms in the fuel ash of pressurized oxy-fuel co-combustion of coal and biomass, a series of cocombustion experiments were carried out in a horizontal tube furnace. The experimental fuels were lignite and corn straw, and the experimental parameters were biomass blending ratio (M b = 0, 30, 50, 70, and 100%), combustion atmosphere (air, Oxy-21, Oxy-30, and Oxy-40), reaction pressure (0.1, 0.3, 0.5, and 0.7 MPa), and combustion temperature (800, 850, and 900 °C). The experimental results showed that SO 2 actual emissions decreased as M b increased while the conversion rate of fuel sulfur to SO 2 was lowest at 50% M b . Ash analysis indicated that more sulfur converted to CaSO 4 at 50% M b . SO 2 actual emissions was highest in the air atmosphere and lowest in the Oxy-21 atmosphere. Higher reaction pressure suppressed SO 2 actual emissions and promoted the sulfur converted to other forms of sulfide, and reaction pressure had no obvious effect on CaSO 4 and K 2 SO 4 in the fuel ash. Higher combustion temperature slightly promoted SO 2 actual emissions and conversion rate of fuel sulfur to SO 2 . Except for 100% M b , the three slagging indexes for all combustion experiments were in the criteria of low slagging trend. According to T-A, slagging caused by alkali metals may occur during 100% M b combustion.

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