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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2015, Vol. 16 Issue (10): 820-829    DOI: 10.1631/jzus.A1300231
Energy Engineering     
Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx during oxy-fuel combustion
Kun-zan Qiu, Ye Yang, Zhuo You, Zhi-hua Wang, Zhi-jun Zhou, Jun-hu Zhou, Ke-fa Cen
1State Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; 2Second Institute for Wuhan Ship Development & Design, Wuhan 430064, China
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Abstract  The indirect chemical effects of fuel dilution by CO2 on NO formation were investigated numerically in this paper. CH4 doped with NH3 was used as fuel, while CO2 and O2 were mixed as oxidant. The dilution effect of CO2 was then investigated through adding extra CO2 to the reaction system. An isothermal plug flow reactor was used. An unbranched chain reaction mechanism is proposed to illustrate the chemical effects of CO2 on the H/O/OH radical pool and NOx. Due to the reaction between CO2 and H, extra NO will be formed in fuel-rich conditions, while NO will be inhibited in fuel-lean conditions and high CO2 dilution conditions. The reaction affected the radical pools of OH, H, and O of the branched chain reaction, and then the formation and reduction of NO. The pool of H had the greatest effect on NO reduction. The results suggest that the indirect chemical effects on NO formation differ between diluted fuel oxy-fuel combustion conditions and normal oxy-fuel conditions.

Key words： CO2      Oxy-fuel combustion      Fuel dilution     
Received: 04 July 2013      Published: 01 October 2015
CLC:  TQ534  
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Kun-zan Qiu
Ye Yang
Zhuo You
Zhi-hua Wang
Zhi-jun Zhou
Jun-hu Zhou
Ke-fa Cen
Cite this article:

Kun-zan Qiu, Ye Yang, Zhuo You, Zhi-hua Wang, Zhi-jun Zhou, Jun-hu Zhou, Ke-fa Cen. Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx during oxy-fuel combustion. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(10): 820-829.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1300231     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2015/V16/I10/820

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