Abstract
O 2/CO 2 coal combustion technology is considered as one of the most promising technologies for CO 2 sequestration due to its economical advantages and technical feasibility. It is significant to study the sulfur transfer behavior of coal in O 2/CO 2 atmosphere for organizing combustion properly and controlling SO 2 emission effectively. To clarify the effect of atmosphere on the sulfur transfer behavior, thermogravimetry coupled with Fourier Transform Infrared (TG-FTIR) system was employed to study the formation behavior of sulfur-containing gas species from Xuzhou bituminous coal pyrolysis in CO 2 atmosphere compared with that in N 2 atmosphere. Also the SO 2 formation behaviors during Xuzhou bituminous coal combustion in O 2/N 2 and O 2/CO 2 atmospheres were investigated. Results show that COS is preferentially formed during the coal pyrolysis process in CO 2 atmosphere rather than in N 2 atmosphere. When temperature is above 1000 K, sulfate in the CO 2 atmosphere begins to decompose due to the reduction effect of CO, which comes from the CO 2 gasification. During coal combustion process, replacing N 2 with CO 2 enhances the SO 2 releasing rate. SO 2 emission increases first and then decreases as O 2 fraction increases in the O 2/CO 2 mixture. XPS result of the ash after combustion indicates that higher O 2 concentration elevates the sulfur retention ability of the mineral matter in the coal.
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