The characteristics of desulfuration of high-sulfur petroleum coke are investigated with a pulse-differential fix bed reactor. The combustion tests are carried out with one representative coke with particle size of 60—70 μm between 830 ℃ and 950 ℃. In the experiment

sulfur is captured by calcium oxide addition

and then yields stable calcium sulfide. Through the tests

five important factors affecting desulfuration are found: temperature

Ca/S molar ratio

oxygen pressure

velocity of gas and intensity of SO2 emission. Burning in air

the optimum Ca/S molar ratio is 2

and the optimum temperature ranges from 850 ℃ to 890 ℃. Intensity of SO2 emission is related with temperature and velocity of gas. Velocity of gas and intensity of SO2 emission have negative effect to desulfuration. Another important finding from the results on high-sulpher petroleum coke is that under the most optimum conditions

the desulfuration ratio in air is higher than that in pure oxygen.