Citation: ZHENG Pan-pan, WANG Yong-gang, WU Xin, LIU Chen, BAI Yan-ping, LIN Xiong-chao. Transformation of nitrogen during pyrolysis of Na-loaded Shengli brown coal[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(4): 418-426. shu

Transformation of nitrogen during pyrolysis of Na-loaded Shengli brown coal

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

Corresponding author: WANG Yong-gang, wyg1960@126.com
Received Date: 17 December 2016
Revised Date: 1 March 2017

Fund Project: the National Natural Science Foundation of China 21406261the Plan of National Science and Technology Support 2012BAA04B02

Figures(7)

The impact of Na content on nitrogen transformation during the pyrolysis of Shengli raw coal and the Na-loaded coal in a fixed-bed/fluidized-bed quartz reactor was investigated. The quantification of NH₃ and HCN in gas product was carried out using an ultraviolet-visible spectrophotometer while the occurrence modes of nitrogen in the solid chars were detected by X-ray photoelectron spectroscopy (XPS). The results indicate that the transformation of coal-N to NH₃ can be catalytically enhanced by certain amount of Na at low temperature. When the final pyrolysis temperature is relatively high, the presence of Na appears to inhibit the formation of NH₃. Meanwhile, for any given pyrolysis temperature, the production of HCN will be suppressed by Na. When the pyrolysis temperature is high, the increase of Na content in coal causes the reduction of nitrogen remaining in char and promotes quaternary nitrogen formation, whereas, the effect is negligible at low temperature.
- brown coal,
- pyrolysis,
- Na,
- nitrogen
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