Citation: ZHAN Hao, ZHANG Xiao-hong, SONG Yan-pei, YIN Xiu-li, WU Chuang-zhi. Formation characteristics of NO_x precursors during gasification of N-rich biomass[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(1): 34-44. shu

Formation characteristics of NO_x precursors during gasification of N-rich biomass

ZHAN Hao ^1,2 ,
ZHANG Xiao-hong ^1,2 ,
SONG Yan-pei ^1,2 ,
YIN Xiu-li ¹ ,
WU Chuang-zhi ^1,,

1.
Key Laboratory of Renewable Energy, CAS, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: WU Chuang-zhi, wucz@ms.giec.ac.cn
Received Date: 17 May 2017
Revised Date: 4 August 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (51676195, 51661145022)the National Natural Science Foundation of China 51661145022the National Natural Science Foundation of China 51676195

Figures(10)

Based on gasification of 4 N-rich biomass (SBS, RS, CS and MDF) in a horizontal tubular quartz reactor, formation characteristics of NO_x precursors were investigated with the help of chemical absorption-spectrophotometry and XPS methods. Effects of fuel's properties (nitrogen functionality and nitrogen content) and gasification conditions (temperature and gasifying agent) were discussed and compared. The results indicate that NH₃-N is the predominant NO_x precursor species mainly produced during devolatilization stage. Each operational factor would alter the yield of each NO_x precursor by affecting their formation pathways. On one hand, thermal stability of nitrogen functionality in fuels (N-A) is a much more important factor than nitrogen content among fuel's properties. Subsequently, due to the primary cracking of unstable N-A (polyamide), total yield of NO_x precursors for MDF reaches up to 74.7% which is higher than that for other straw biomass by 15%. On the other hand, gasification conditions would influence the reaction routes relevant to NO_x precursors during secondary reactions, especially for the hydrogenation reaction. As a consequence, during SBS gasification, when temperature rises from 800 to 1000℃, NH₃-N yield keeps a constant increase from 38.9% to 47.7% while HCN-N increases first and then decreases with a peak value of 18.3%, which may depend on the balance between reaction routes affected by temperature. As for gasifying agent, the presence of CO₂ would partly inhibit HCN-N yield while the introduction of H₂O would moderately promote NH₃-N yield, which is attributed that the hydrogenation reaction would be strongly affected by gasifying agent. Hence, it is concluded that the selectivity and partitioning of NO_x precursors could be changed by employing different ratio of gasifying agents.
- N-rich biomass gasification,
- NO_x precursors,
- NH₃-N,
- gasifying agent,
- hydrogenation reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Formation characteristics of NOx precursors during gasification of N-rich biomass

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Formation characteristics of NO_x precursors during gasification of N-rich biomass