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The effects of O2 concentrations on the ignition and MILD combustion of intensely diluted C2H6 in a counterflow jets

Author

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  • Jia, Huiqiao
  • Qian, Xiang
  • Li, Jiarui
  • Yang, Jinling
  • Zou, Chun
  • Cao, Shiying
  • Yao, Hong

Abstract

A detailed study on the ignition characteristics of C2H6 diluted intensively in non-premixed systems at the four O2 volume ratio(10%, 21%, 30% and 40%) has be conducted in this paper. IDIM 2.0 for predicting the ignition temperature of C1–C2 has been developed, and been verified by the ignition temperatures of CH4 and C2H6 from our and Fotache et al.‘s experiments. Through the S-curves analysis, the appearance of the “slow” radical concentration growth is not the important indicator of the effect of dilution on the ignition of C2H6. The reason for the emergence of slow growth zone in the case of 100% C2H6 is that many reactions making important positive contribution to the ignition are endothermic. The characteristics of dilution effects are mainly reflected in two aspects: 1)the oxidation pathway is extended further to CO2 under intense dilution conditions; 2)the enhancement of the pathway, CH3→CO→CO2. The effect of O2 concentration on the ignition temperature will change as the fuel is diluted. For 7% C2H6, the order of ignition temperatures of various O2 concentrations from low to high is 21% < 10%<40%. Within the scope of this study, the preheating temperature to maintain MILD combustion under 21% O2 concentration is the lowest for intensely diluted C2H6.

Suggested Citation

  • Jia, Huiqiao & Qian, Xiang & Li, Jiarui & Yang, Jinling & Zou, Chun & Cao, Shiying & Yao, Hong, 2021. "The effects of O2 concentrations on the ignition and MILD combustion of intensely diluted C2H6 in a counterflow jets," Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:energy:v:228:y:2021:i:c:s036054422100801x
    DOI: 10.1016/j.energy.2021.120552
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    References listed on IDEAS

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    1. Mardani, Amir & Khanehzar, Andisheh, 2019. "Numerical assessment of MILD combustion enhancement through plasma actuator," Energy, Elsevier, vol. 183(C), pages 172-184.
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    4. Jia, Huiqiao & Zou, Chun & Lu, Lixin & Zheng, Hangfei & Qian, Xiang & Yao, Hong, 2018. "Ignition of CH4 intensely diluted with N2 and CO2 versus hot air in a counterflow jets," Energy, Elsevier, vol. 165(PB), pages 315-325.
    5. Jia, Huiqiao & Zou, Chun & Lu, Lixin & Qian, Xiang & Yao, Hong, 2019. "Ignition of CH4 intensely diluted with CO2 versus hot O2/CO2 with high oxygen concentration in a counterflow jets," Energy, Elsevier, vol. 177(C), pages 412-420.
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    Cited by:

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    More about this item

    Keywords

    Ignition characteristics of C2H6; IDIM 2.0; Dilution effects; Effect of O2 concentration;
    All these keywords.

    JEL classification:

    • O2 - Economic Development, Innovation, Technological Change, and Growth - - Development Planning and Policy

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