NO and N2 Formation Behavior during the High-Temperature O2 Gasification of Coal Char

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• 作者：Hironori Orikasa and Akira Tomita
• 刊名：Energy & Fuels
• 出版年：2003
• 出版时间：March 2003
• 年：2003
• 卷：17
• 期：2
• 页码：405 - 411
• 全文大小：126K
• 年卷期：v.17,no.2(March 2003)
• ISSN：1520-5029

文摘

NO- and N₂-formation behavior during the high-temperature O₂ gasification of coal char wasexamined using a pulse gasification reactor, which minimizes the exothermic heat generationand the secondary reaction of NO. Coal char heat treated at 1300 C was gasified with 10% O₂in a temperature range from 1000 to 1300 C. Although the total nitrogen converted to NO andN₂ are independent of gasification temperature, a fraction of NO tends to increase with increasingchar conversion and decrease with increasing gasification temperature. These trends can beexplained by the secondary N₂-formation reaction from NO and char via nitrogen-containingsurface species as an intermediate. This result is similar to that observed in the previous studyat low temperatures, except that the surface nitrogen species is less stable at high temperature.In another series of experiments, the char prepared at 950 C was subjected to gasification withoutpretreatment at 1300 C. The NO- and N₂-formation behavior heavily depends on whether thechar was pretreated at 1300 C. The release of unstable char nitrogen as N₂ was observed inaddition to the N₂ formation from the char-NO reaction when the char was not heat-treated ata severe condition. The relative importance of these two N₂-formation routes determines the finalgas composition.