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Influence of CO_2, CH_4, and initial temperature on H_2/CO laminar flame speed

机译:CO_2,CH_4和初始温度对H_2 / CO层流火焰速度的影响

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摘要

The objective of this study is to investigate the impact of syngas composition by varying the H_2/CO ratio (1:3, 1:1, and 3:1 by volume), the CO_2 dilution (0%-40%), and methane addition (0%-40%) on laminar flame speed. Thus, laminar flame speeds of premixed syngas-air mixtures were measured for different equivalence ratios (0.8-2.2) and inlet temperatures (295-450 K) using the Bunsen-burner method. It was found that laminar flame speed increases with increasing H_2/CO ratio, while CO_2 dilution or CH_4 addition decreased it. The location of the maximum flame speed shifts to richer mixtures with decreasing H_2/CO ratio, while it shifts to leaner mixtures with the addition of CH_4 due to its inherent slower flame speed. The location of the maximum flame speed is also shifted towards leaner mixtures with the addition of CO_2 due to the preponderance of the reduction of the adiabatic flame temperature with increasing dilution. Comparison between experimental and numerical results shows a better agreement using a modified mechanism derived from GRI-Mech 3.0. A correlation, based on the experimental results, is proposed to calculate the laminar flame speed over a wide range of equivalence ratios, inlet temperatures, and fuel content.
机译:这项研究的目的是通过改变H_2 / CO比例(体积比为1:3、1:1和3:1),CO_2稀释度(0%-40%)和甲烷来研究合成气组成的影响在层流火焰速度上添加(0%-40%)。因此,使用本生燃烧器方法测量了不同当量比(0.8-2.2)和入口温度(295-450 K)的预混合合成气-空气混合物的层流火焰速度。发现层流火焰速度随H_2 / CO比的增加而增加,而CO_2稀释或CH_4的添加降低了层流的火焰速度。随着H_2 / CO比的降低,最大火焰速度的位置转移到更浓的混合物,而由于CH_4固有的较慢的火焰速度,它在添加CH_4的情况下转移到更稀薄的混合物。由于增加了绝热火焰温度降低的优势,最大火焰速度的位置也随着添加CO_2而向更稀薄的混合物移动。实验结果和数值结果之间的比较表明,使用源自GRI-Mech 3.0的改进机制,可获得更好的一致性。提出了一种基于实验结果的相关性,可以在相当的当量比,进气温度和燃料含量范围内计算层流火焰速度。

著录项

  • 来源
    《International journal of hydrogen energy》 |2014年第7期|3477-3486|共10页
  • 作者

    Denis Lapalme; Patrice Seers;

  • 作者单位

    Department of Mechanical Engineering, Ecole de technologie superieure, 1100 Notre-Dame Ouest, Montreal, QC H3C 1K3, Canada;

    Department of Mechanical Engineering, Ecole de technologie superieure, 1100 Notre-Dame Ouest, Montreal, QC H3C 1K3, Canada;

  • 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; Laminar flame speed; Methane; CO_2 dilution; Reactant preheat;

    机译:合成气层流火焰速度;甲烷CO_2稀释;反应物预热;
  • 入库时间 2022-08-18 00:23:57

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