Full Text:   <684>

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CLC number: TQ534

On-line Access: 2015-10-01

Received: 2013-07-04

Revision Accepted: 2015-07-27

Crosschecked: 2015-09-15

Cited: 0

Clicked: 1357

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Kun-zan Qiu

http://orcid.org/0000-0003-0978-2697

Zhi-hua Wang

http://orcid.org/0000-0002-7521-2900

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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.10 P.820-829

10.1631/jzus.A1300231


Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx 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


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[J]. Journal of Zhejiang University Science A, 2015, 16(5): 820-829.

@article{title="Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx 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",
volume="16",
number="10",
pages="820-829",
year="2015",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1300231"
}

%0 Journal Article
%T Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx 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
%V 16
%N 10
%P 820-829
%@ 1673-565X
%D 2015
%I Zhejiang University Press & Springer

TY - JOUR
T1 - Effect of dilution of fuel in CO2 on the conversion of NH3 to NOx 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
VL - 16
IS - 10
SP - 820
EP - 829
%@ 1673-565X
Y1 - 2015
PB - Zhejiang University Press & Springer
ER -


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.

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NOx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NOx生成的影响,为探索NOx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NOx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NOx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NOx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:CO2;富氧燃烧;NO;燃料稀释

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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