JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

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Effect of dilution of fuel in CO₂ on the conversion of NH₃ to NO_x during oxy-fuel combustion

Author(s): Kun-zan Qiu, Ye Yang, Zhuo You, Zhi-hua Wang, Zhi-jun Zhou, Jun-hu Zhou, Ke-fa Cen
Affiliation(s): 1State Key Lab of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; more
Corresponding email(s): wangzh@zju.edu.cn
Key Words: CO₂, Oxy-fuel combustion, NO, Fuel dilution

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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 NO_x during oxy-fuel combustion[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A1300231

@article{title="Effect of dilution of fuel in CO₂ on the conversion of NH₃ to NO_x during oxy-fuel combustion",
author="Kun-zan Qiu, Ye Yang, Zhuo You, Zhi-hua Wang, Zhi-jun Zhou, Jun-hu Zhou, Ke-fa Cen",
journal="Journal of Zhejiang University Science A",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/jzus.A1300231"
}

%0 Journal Article
%T Effect of dilution of fuel in CO₂ on the conversion of NH₃ to NO_x during oxy-fuel combustion
%A Kun-zan Qiu
%A Ye Yang
%A Zhuo You
%A Zhi-hua Wang
%A Zhi-jun Zhou
%A Jun-hu Zhou
%A Ke-fa Cen
%J Journal of Zhejiang University SCIENCE A
%P 820-829
%@ 1673-565X
%D in press
%I Zhejiang University Press & Springer
doi="https://doi.org/10.1631/jzus.A1300231"

TY - JOUR
T1 - Effect of dilution of fuel in CO₂ on the conversion of NH₃ to NO_x during oxy-fuel combustion
A1 - Kun-zan Qiu
A1 - Ye Yang
A1 - Zhuo You
A1 - Zhi-hua Wang
A1 - Zhi-jun Zhou
A1 - Jun-hu Zhou
A1 - Ke-fa Cen
J0 - Journal of Zhejiang University Science A
SP - 820
EP - 829
%@ 1673-565X
Y1 - in press
PB - Zhejiang University Press & Springer
ER -
doi="https://doi.org/10.1631/jzus.A1300231"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

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 NO_x. 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.

Abstract: This paper reports on a computational study of the influence of CO2 dilution and reaction on the formation and reduction of NO generated from CH4 doped with NH3 (to simulate fuel-bound N).The area of study is of great importance to the combustion and energy community.

模拟富氧燃烧过程中燃料在CO₂中稀释对NH₃向NO_x转化影响的研究

目的：探索燃料富氧燃烧过程中不同浓度CO₂的稀释作用对NO_x生成的影响，为探索NO_x在O₂/CO₂气氛中生成机理研究提供理论基础。
创新点：提出一种无分支链式反应解释说明CO₂在还原性粒子环境中对反应的影响。
方法：通过Chemkin Pro中塞流式反应器模块对混入NH₃的CH₄燃料在O₂/CO₂气氛中反应进行数值模拟，同时改变CO₂的稀释程度来探索CO₂浓度对NO_x生成的影响，并比较不同反应机理下的模拟结果，探索此环境中NO_x的生成机理（表1）。
结论：1. 无支链反应机理可用于解释CO₂在还原性粒子环境中对NO_x生成与还原的影响；2. 随着CO₂浓度的升高，无支链反应和支链反应相互竞争H，进而抑制NO的生成；3. 在对NH₃转化效率的影响方面，CO₂浓度增加引发的无支链反应和支链反应对H的竞争，在富燃料条件下从促进转化变为抑制转化，在化学当量和贫燃料条件下从无影响变为抑制转化。

关键词组：CO₂；富氧燃烧；NO；燃料稀释

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模拟富氧燃烧过程中燃料在CO2中稀释对NH3向NOx转化影响的研究

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模拟富氧燃烧过程中燃料在CO₂中稀释对NH₃向NO_x转化影响的研究