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首页> 外文期刊>Combustion and Flame >Quantitative LIF measurements and kinetics assessment of NO formation in H-2/CO syngas-air counterflow diffusion flames
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Quantitative LIF measurements and kinetics assessment of NO formation in H-2/CO syngas-air counterflow diffusion flames

机译：H-2 / CO合成气-空气逆流扩散火焰中LIF的定量测量和动力学评估

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摘要

Quantitative non-intrusive measurements of NO species using the Laser Induced fluorescence technique are reported in laminar counterflow syngas-air diffusion flames for a wide range of strain rates and as a function of fuel composition (i.e. H-2/CO ratio). The local strain rate of the flames was varied from 35 s(-1) to 750 s(-1) for three compositions of syngas (1:4, 1:1 and 4:1 H-2/CO ratio). Numerical simulations corresponding to the experimental conditions were conducted using OPPDIF with six H-2/CO chemical kinetic mechanisms from the literature. The peak [NO] predictions by mechanism M3 (GRTIVIech. 3.0) were found to be closest to measurements at low strain rates, while predictions using M1 (partial C1 mechanism by Li et al.) and M4 (full C1 mechanism by Li et al.) mechanisms improved at higher strain rates. A Quantitative Reaction Path Diagram (QRPD) analysis showed that mechanism M3 (GRIAIech 3.0) predicted a shift from the NNH (dinitrogen monohydride) and prompt NO pathways towards NNH pathway contributing to NO formation with increasing strain rates. Mechanism M6 (Konnov 0.6) predicted significant prompt NO contributions via an alternate CNN pathway in addition to the NNH pathway at low as well as high strain rates. Unlike M3 and M6, the M1 mechanism consistently predicted the NNH pathway to be the sole major route for NO formation across all strain rates. The N2O intermediate pathway was found to be insignificant for most of the flames. The sensitivity analysis concerning the effect of CH4 on NO formation routes indicated the need to include CH chemistry in the mechanisms, so as to model the NO formation accurately for H-2/CO mixtures containing even trace amounts of hydrocarbons. Lastly, the NO emission indices (EINO) are reported as a function of strain rates for the three compositions of syngas showing 32%H-2:8%CO case resulting in the lowest NO emissions and fuel consumption per unit power output. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在层流逆流合成气-空气扩散火焰中，对于大范围的应变速率和燃料成分（即H-2 / CO比）的函数，使用激光诱导荧光技术对NO物种进行了定量的非侵入式测量。对于三种合成气成分（1：4、1：1和4：1 H-2 / CO比），火焰的局部应变率从35 s（-1）到750 s（-1）不等。使用OPPDIF和文献中的六种H-2 / CO化学动力学机理进行了与实验条件相对应的数值模拟。发现机制M3（GRTIVIech。3.0）的峰值[NO]预测最接近于低应变率下的测量，而使用M1（Li等人的部分C1机制）和M4（Li等人的完整C1机制）预测。 。）在较高的应变速率下机制得到改善。定量反应路径图（QRPD）分析表明，机理M3（GRIAIech 3.0）预测了从NNH（一氢化二氮）的转变，并提示NO途径向NNH途径转变，从而随着应变速率的增加而促进了NO的形成。机理M6（Konnov 0.6）预测，在低和高应变速率下，除NNH途径外，还将通过替代的CNN途径显着促进NO迅速产生。与M3和M6不同，M1机制始终预测NNH途径是所有菌株速率下NO形成的唯一主要途径。发现N2O中间途径对于大多数火焰而言并不重要。有关CH4对NO形成途径影响的敏感性分析表明，需要在机理中包括CH化学，以便为甚至包含痕量烃的H-2 / CO混合物准确模拟NO形成。最后，NO排放指数（EINO）被报告为三种合成气组成的应变率的函数，显示出32％H-2：8％CO的情况，导致最低的NO排放和每单位功率输出的燃料消耗。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

著录项

  • 来源
    《Combustion and Flame》 |2016年第11期|208-228|共21页
  • 作者

    Sahu Amrit Bikram; Ravikrishna R. V.;

  • 作者单位

    Indian Inst Sci, Dept Mech Engn, Combust & Spray Lab, Bangalore, Karnataka, India;

    Indian Inst Sci, Dept Mech Engn, Combust & Spray Lab, Bangalore, Karnataka, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Syngas; NO LIF; Counterflow diffusion flames; Kinetic mechanisms;

    机译：合成气;NO LIF;逆流扩散火焰;动力学机理;

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