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Experimental Study of Volatile-N Conversion at O2/CO2 Atmosphere in a Drop Tube Furnace

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Cleaner Combustion and Sustainable World (ISCC 2011)

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Abstract

In coal combustion, NOx is largely formed from the oxidation of volatile nitrogen compounds such as HCN and NH3. The experiments on the volatile-N conversion to NO at O2/CO2 atmosphere were carried out in a drop tube furnace. The effects of the excess oxygen ratio λ (0.6–1.4), temperature (1,000–1,300 °C), O2/CO2 ratio, and as well as CH4/NH3 mole ratio were investigated. To further understand the importance of NO reburn during volatile combustion, experiments were also performed with different concentrations of background NO (0–950 ppm). The results show that volatile-N conversion to NO is sensitive to excess oxygen ratio λ at strongly oxidizing atmosphere. For volatile combustion, there is an optimal temperature and inlet O2 concentration to minimize the volatile-N conversion to NO. The CH4/NH3 mole ratio plays an important role on the NO formation under oxidizing atmosphere. High levels of background NO prohibit the volatile-N conversion to NO significantly as the volatile-N conversion ratio decreases by 19–36%. The reburn fractions of recycle NO in fuel-rich and fuel-lean condition are 14.8 and 9.8% at 1,200 °C, respectively.

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Acknowledgment

The authors greatly acknowledge the financial support for this research provided by the National Natural Science Foundation of China (Project No. 50876025).

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Authors and Affiliations

  1. Combustion Engineering Research Institute, Harbin Institute of Technology, Harbin, 150001, China

    Huali Cao, Shaozeng Sun, Hao Chen, Xianyu Meng & Dong Wang

  2. Chemical Engineering, University of Newcastle, Newcastle, NSW, 2308, Australia

    Terry F. Wall

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  1. Huali Cao
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  2. Shaozeng Sun
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  3. Hao Chen
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  4. Xianyu Meng
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  5. Dong Wang
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  6. Terry F. Wall
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Corresponding author

Correspondence to Shaozeng Sun .

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Editors and Affiliations

  1. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Haiying Qi

  2. Institute of Thermal Engineering, Tsinghua University, Beijing, China, People's Republic

    Bo Zhao

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© 2013 Springer-Verlag Berlin Heidelberg & Tsinghua University Press

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Cao, H., Sun, S., Chen, H., Meng, X., Wang, D., Wall, T.F. (2013). Experimental Study of Volatile-N Conversion at O2/CO2 Atmosphere in a Drop Tube Furnace. In: Qi, H., Zhao, B. (eds) Cleaner Combustion and Sustainable World. ISCC 2011. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30445-3_52

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  • DOI: https://doi.org/10.1007/978-3-642-30445-3_52

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30444-6

  • Online ISBN: 978-3-642-30445-3

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