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- W3081687687 abstract "Coal blending is an effective method to reduce the slagging tendency. The mineral transformation within blended coal ashes has an important influence on the slagging behaviors, which have been well studied under conventional air-fuel condition. Oxy-fuel combustion is recognized as one of the most promising CO 2 reduction technologies. However, the mineral transformation within blended coal ashes in oxy-fuel condition has yet to be fully understood. This work is aimed to comprehensively study the influence of CO 2 atmosphere on Ca -containing mineral transformation behaviors during a Ca dominated coal co-firing with a Si/Al dominated coal in O 2 /CO 2 condition by TG-DSC, XRD and HSC simulation. These results show that the atmosphere significantly affects on the transformation of Ca -containing mineral and the final existing form of Ca in the blended coal ashes. When the high content Ca coal is blended with the high content Al/Si coal in the O 2 /CO 2 atmosphere, the CO 2 promotes the transformation of Ca into CaCO 3 and Ca under low temperature mainly exists in the form of CaCO 3 (little CaSO 4 ) in the blended coal ashes. CaCO 3 under high temperature is decomposed to produce highly active CaO, and CaO reacts with Al/Si to form the low melting point minerals, which may aggravate the slagging tendency. The present study can provide useful information to reduce the slagging behavior of the blended coals in the O 2 /CO 2 atmosphere. • Ca -containing mineral transformation of blended coal oxy-fuel combustion is studied. • The atmosphere affects the final Ca- existing form within blended coal ashes. • The CO 2 in O 2 /CO 2 promotes the transformation of Ca into CaCO 3 . • CaCO 3 is decomposed to produce highly active CaO under high temperature. • CaO– Al/Si reaction produces low melting point mineral to aggravate the slagging." @default.
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- W3081687687 date "2020-12-01" @default.
- W3081687687 modified "2023-09-27" @default.
- W3081687687 title "Effect of CO2 atmosphere on Ca-containing mineral transformation behaviors during a Ca dominated coal co-firing with a Si/Al dominated coal in oxy-fuel condition" @default.
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- W3081687687 doi "https://doi.org/10.1016/j.joei.2020.08.013" @default.
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