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Effect of N 2 Replacement by CO 2 in Coaxial-Flow on the Combustion and Emission of a Diffusion Flame

Author

Listed:
  • Haisheng Zhen

    (The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China)

  • Zhilong Wei

    (The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China)

  • Zhenbin Chen

    (The Mechanical and Electrical Engineering College, Hainan University, Haikou 570228, China)

Abstract

In this study, a double concentric burner burning methane with an annular coaxially-flowing oxidizer was adopted to operate the diffusion flame in lifted flame regime. The effects of coaxial-flow velocity, coaxial-flow composition variation through total and partial replacement of N 2 , and coaxial-flow oxygen enrichment were experimentally investigated in terms of the resultant changes in the flame stability, and thermal and emission characteristics. Consistent with the triple flame theory, the current stability tests show a linear increase in flame lift height with increasing coaxial-flow velocity and the blowout of lifted flames occurred at constant flame tip height. Replacement of N 2 by CO 2 in the coaxial-flow deteriorated the flame stability by significantly reducing the threshold coaxial-flow velocity. Due to combustion enhancement that is caused by oxygen enrichment, the threshold coaxial-flow velocity increased and this increase is more significant for the N 2 -diluted flame than CO 2 -diluted. Two of the most important NO x formation mechanisms, Zeldovich and Fenimore, were analyzed under the relatively low temperature flame conditions, generally below 1300 °C in this study. Results show that NO x is principally produced via the Fenimore mechanism for both N 2 - and CO 2 -diluted flames. NO x productions can be significantly affected by coaxial-flow composition and coaxial-flow velocity. An increase in the velocity of N 2 -diluted coaxial-flow increases NO x emissions, while a reverse trend occurred, as N 2 in the coaxial-flow was replaced or partially replaced by CO 2 , which is ascribed to the strong combustion-resisting behavior of CO 2 . For all cases, CO emissions vary in the opposite direction of NO x emissions. Due to the strong thermal and chemical effects of CO 2 on combustion in comparison to N 2 , total or partial replacement of N 2 by CO 2 results in a steep increase in CO emissions.

Suggested Citation

  • Haisheng Zhen & Zhilong Wei & Zhenbin Chen, 2018. "Effect of N 2 Replacement by CO 2 in Coaxial-Flow on the Combustion and Emission of a Diffusion Flame," Energies, MDPI, vol. 11(5), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:5:p:1032-:d:142875
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    References listed on IDEAS

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