Effects of inherent alkali and alkaline earth metals on nitrogen transformation during steam gasification of Shengli lignite

International Journal of Coal Science & Technology

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[1] 0000 0000 9030 231X, grid.411510.0, School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), 100083, Beijing, People’s Republic of China;0000 0001 2156 6140, grid.268154.c, Department of Chemical and Biomedical Engineering, West Virginia University, 26506, Morgantown, WV, USA;

关键词: Lignite;    Steam gasification;    Nitrogen transformation;    Alkali metal;    Alkaline earth metal;   

DOI  :  10.1007/s40789-019-0248-3

来源: publisher

【 摘 要 】

This work evaluated the effects of inherent alkali and alkaline earth metals on nitrogen transformation during steam gasification of Shengli lignite at the temperature of 873–1173 K in a fluidized-bed/fixed-bed quartz reactor. The results indicated that the alkali metal Na and alkaline earth metals Ca, Mg in coal have different effects on inherent nitrogen transformation to NH3, HCN and char-N during the lignite steam gasification. Specifically during the steam gasification of Shengli lignite, Na and Ca, Mg not only catalyze the inherent nitrogen conversions to NH3, but also promote the secondary reactions of the nascent char-N as well as the generation of NH3 from the generated HCN, meanwhile they also inhibited the inherent nitrogen conversion to HCN and char-N. The presence of Na, Ca and Mg hindered the formation of oxidized nitrogen (N-X) functional groups, but enhanced pyridinic nitrogen (N-6) and quaternary nitrogen’s (N-Q) formation in char.

【 授权许可】

CC BY