Fuel Nitrogen Evolution during Coal Pyrolysis and Gasification
(0) The morphology of fuel nitrogen in coal and its fate during pyrolysis and the nitrogen species including N2, HCN and NH3 during coal pyrolysis and gasification have been investigated to clarify the evolution mechanism of fuel nitrogen in heat treatment process. Experimental results show that the morphology of coal nitrogen in the studied Chinese raw coals generally include pyrrolic nitrogen (N-5), pyridinic nitrogen (N-6), quaternary nitrogen (N-Q) and nitrogen-oxide (N-X). Generally, nitrogen in char is transformed to volatile and more stable components during pyrolysis. Char-N is the major source of NOx precursors during temperature programmed pyrolysis in 600-800°C. N-5 and N-X in char is converted to HCN first, and HCN is then hydrogenated to NH3. N-Q in char is the main source of nitrogen gas. The major nitrogenous gas products during rapid coal pyrolysis are N2, HCN and NH3, amongst which N2 is dominant. The yields of N2 and NOx precursors, such as HCN and NH3, increase with increased pyrolysis temperature. The major gaseous nitrogenous products during coal gasification in steam include HCN, NH3 and N2. H2O is the main source of the groups containing hydrogen, which not only participates in the reaction as a gasification agent, but also has catalysis on the reaction.
Fuel nitrogen nitrogen morphology pyrolysis nitrogen transformation pyrolysis gasification
Defu Che Yinhe Liu Junguang Lin
State Key Laboratory of Multiphase Flow in Power Engineering, Xian Jiaotong University, China
国际会议
西安
英文
56-65
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）