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Combustion state monitoring of premixed heating appliances with flame ionization current and chemiluminescence

机译:用火焰电离电流和化学发光法监测预混合加热器的燃烧状态

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摘要

The development of a combustion operating point control system has received interests from gas boiler manufacturers in order to ensure optimized performances despite variations of natural gas composition. Fully premixed burners are widely used in these boilers and the equivalence ratio is a key parameter to control. Experiments are carried out in this study for CH4/air fuel blends diluted by N-2 or CO2 or enriched by H-2, C2H6, or C3H8. Two low cost solutions for monitoring the equivalence ratio based on the flame ionization current and the chemiluminescence signal are investigated on a laboratory laminar conical flame. The behavior of the ionization current with changes of gas velocity, fuel composition, and equivalence ratio is shown to be mainly related to the size of the dead space between the flame base and burner rim. In a second stage, changes of the chemiluminescence signal is studied and the use of CH*/OH* intensity ratio as an equivalence ratio indicator is verified. Numerical 1-D premixed flame simulations are performed to support the experimental results on the flame chemiluminescence. Finally, a third equivalence ratio sensing method is proposed, coupling both techniques and the three strategies are compared.
机译:燃烧操作点控制系统的开发已受到燃气锅炉制造商的关注,目的是尽管天然气成分发生变化,但仍可确保最佳性能。完全预混燃烧器广泛用于这些锅炉中,当量比是控制的关键参数。在这项研究中,对被N-2或CO2稀释或被H-2,C2H6或C3H8富集的CH4 /空气燃料混合物进行了实验。在实验室层流锥形火焰上研究了两种基于火焰电离电流和化学发光信号监测当量比的低成本解决方案。电离电流随气体速度,燃料成分和当量比的变化而表现出的行为主要与火焰底座和燃烧器边缘之间的死区大小有关。在第二阶段,研究化学发光信号的变化,并验证了CH * / OH *强度比作为当量比指示剂的使用。进行一维数字预混火焰模拟以支持火焰化学发光的实验结果。最后,提出了第三种当量比传感方法,比较了两种技术和三种策略。

著录项

  • 来源
    《Combustion Science and Technology》 |2019年第3期|382-401|共20页
  • 作者单位

    Univ Paris Saclay, Cent Supelec, CNRS, Lab EM2C, 3 Rue Joliot Curie, F-91192 Gif Sur Yvette, France|Bosch Thermotechnol, St Thegonnec, France;

    Univ Paris Saclay, Cent Supelec, CNRS, Lab EM2C, 3 Rue Joliot Curie, F-91192 Gif Sur Yvette, France;

    Univ Paris Saclay, Cent Supelec, CNRS, Lab EM2C, 3 Rue Joliot Curie, F-91192 Gif Sur Yvette, France;

    Univ Paris Saclay, Cent Supelec, CNRS, Lab EM2C, 3 Rue Joliot Curie, F-91192 Gif Sur Yvette, France|Univ Toulouses, CNRS, IMFT, Toulouse, France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Combustion control; Domestic boiler; Flame ionization current; Flame chemiluminescence;

    机译:燃烧控制;家用锅炉;火焰电离电流;火焰化学发光;

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