Citation: WANG Yong-gang, ZHENG Pan-pan, YANG Sa-sha, ZHANG Shu, BAI Yan-ping, JIA Xiao-lu. Influence of demineralization using acid wash on N migration and transformation during pyrolysis of Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(5): 519-526. shu

Influence of demineralization using acid wash on N migration and transformation during pyrolysis of Shengli brown coal

1.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Corresponding author: WANG Yong-gang, ZHANG Shu,
Received Date: 9 October 2013
Available Online: 24 December 2013
Fund Project: 国家科技支撑计划 (2012BAA04B02)。 (2012BAA04B02)

This paper is to examine effects of inherent minerals in coal on N migration and transformation during the fast pyrolysis of Shengli brown coal at the temperatures of 773~1 173 K in a bench-scale fluidized-bed quartz reactor. Based on the comparison between raw coal and acid-washed coal, we can find that the alkali Na and alkaline Ca were the key reasons for the difference in N evolutions from raw coal and demineralized coal during the pyrolysis. The Na and Ca could efficiently facilitate the formation of NH₃ and inhibit the production of HCN. The metallic species had obvious catalytic effects for the conversion from tar-N to NH₃. Meantime, the existence of alkali and alkaline metals has enhanced the cracking reactions of coal char, thus reducing the yields of char and char-N. In addition, the relative amount of pyridinic(N-6) in demineralized coal char was higher than that in raw coal, while less quternary type nitrogen (N-Q) and pyrrolic nitrogen(N-5) were found in the demineralized coal char.
- brown coal,
- pyrolysis,
- nitrogen,
- alkali metal,
- alkaline metal
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