A new scheme of oxyfuel combustion combined with partial removal of CO 2 from recycled gas and MILD combustion was proposed. Through experiments and theoretical analysis including the Monte Carlo method, the characteristics of in-furnace desulfurization in this new scheme was investigated. It was found that as the initial O 2 concentration decreased, the gas recirculation ratio, SO 2 concentration, and global efficiency of in-furnace desulfurization increased. On the other hand, the gas recirculation ratio, SO 2 concentration, and global efficiency of in-furnace desulfurization increased as the CO 2 removal ratio increased. The practical residence time of SO 2 in oxyfuel-MILD coal combustion increased to about five to thirteen times as long as that of conventional pulverized coal combustion. The contributions of oxyfuel combustion, partial removal of CO 2 from recycled gas, and MILD combustion, to the high desulfurization efficiency, were almost the same importance. At CO 2 removal ratio = 11% and initial O 2 concentration = 16%, the gas recirculation ratio became as high as 99.12%, i.e., only 0.88% of the flue gas was exhausted to the atmosphere. The corresponding system desulfurization efficiency was as high as 95.8%. It was demonstrated that this new scheme can realize extremely high in-furnace desulfurization efficiency in addition to easy CO 2 recovery.
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