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

Authors :
Zheng, Panpan
Wang, Yonggang
Liu, Chen
Guo, Weijie
Bai, Lei
Hu, Xiao
Lin, Xiongchao
Source :
International Journal of Coal Science & Technology; Jun2019, Vol. 6 Issue 2, p197-206, 10p
Publication Year :
2019

Abstract

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 NH<subscript>3</subscript>, 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 NH<subscript>3</subscript>, but also promote the secondary reactions of the nascent char-N as well as the generation of NH<subscript>3</subscript> 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20958293
Volume :
6
Issue :
2
Database :
Complementary Index
Journal :
International Journal of Coal Science & Technology
Publication Type :
Academic Journal
Accession number :
137207359
Full Text :
https://doi.org/10.1007/s40789-019-0248-3