Citation: ZHANG Shu, BAI Yan-ping, MI Liang, ZHENG Pan-pan, CHEN Xu-jun, XU De-ping, WANG Yong-gang. Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(10): 1153-1159. shu

Effect of heating rate on migration and transformation of N during pyrolysis of Shengli brown coal

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

Corresponding author: ZHANG Shu, WANG Yong-gang,
Received Date: 28 January 2013
Available Online: 26 April 2013
Fund Project: 国家科技支撑计划 (2012BAA04B02)。 (2012BAA04B02)

The effects of heating rate on migration, transformation and occurring forms of nitrogen during pyrolysis of Shengli brown coals were studied in a fixed-bed/fluidised-bed quartz reactor. The results indicate that the yields of NH₃ and HCN from the fast pyrolysis were much higher than those from the slow pyrolysis. The difference in the yields of NH₃ and HCN between the fast and slow heating rates increases with the increasing pyrolysis temperature. The maximum productions of NH₃ and HCN mostly occur at 973K, which is attributed to the enhanced condensation and secondary reactions with the increasing pyrolysis temperature. The release rate of char-N is faster than the weight loss rate of char itself at fast heating rate. The results from X-ray photoelectron spectroscopy (XPS) analysis imply that the pyrolysis process has facilitated the transformation of pyrrolic (N-5) to quaternary type nitrogen (N-Q) and pyridinic (N-6). It seems that the fast heating rate favors the formation of N-6 while the content of N-Q in char is relatively high at the slow heating rate.
- brown coal,
- pyrolysis,
- heating rate,
- nitrogen transformation
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