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Properties of inverse nonpremixed pure O2/CH4 coflow flames in a model combustor

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  • Choi, Sun
  • Kim, Tae Young
  • Kim, Hee Kyung
  • Koo, Jaye
  • Kim, Jeong Soo
  • Kwon, Oh Chae

Abstract

In order to evaluate the potential of oxy-combustion of inverse nonpremixed coflow flames using a clean fuel to improve the combustion and emission characteristics compared with the normal coflow flames using air, the fundamental properties of inverse nonpremixed pure oxygen (O2)/methane (CH4) coflow flames in a model combustor are experimentally investigated. The combustion stability (extinction) limits, structure and nitrogen oxide (NOx) emissions of the inverse coflow flames in the quartz-windowed combustion chamber with a single shear coaxial injector and a fully opened exhaust nozzle are measured using OH∗ chemiluminescence, a schlieren imaging system and a gas analyzer. Results show four distinct stability regimes and limits: the attached flame regime, the near-blowout flame regime, blowout limits and blowoff limits. The direct flame and OH∗ chemiluminescence images confirm the cooling effects of chamber walls that cause no steady liftoff flame and only the near-blowout flame. The extinction limits of the inverse CH4/O2 coflow flames are extended compared with the normal CH4/air coflow flames and reasonable levels of NOx emissions are observed, which supports that oxy-combustion of the inverse nonpremixed coflow flames using the clean fuel is acceptable for practical application, providing a useful database for modeling the flames in the confined chamber.

Suggested Citation

  • Choi, Sun & Kim, Tae Young & Kim, Hee Kyung & Koo, Jaye & Kim, Jeong Soo & Kwon, Oh Chae, 2015. "Properties of inverse nonpremixed pure O2/CH4 coflow flames in a model combustor," Energy, Elsevier, vol. 93(P1), pages 1105-1115.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:1105-1115
    DOI: 10.1016/j.energy.2015.09.110
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    1. Oh, Jeongseog & Noh, Dongsoon & Ko, Changbok, 2013. "The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace," Energy, Elsevier, vol. 62(C), pages 362-369.
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    1. Choi, Sun & Kim, Tae Young & Kim, Hee Kyung & Jeung, In-Seuck & Koo, Jaye & Kwon, Oh Chae, 2017. "Combustion stability of gaseous CH4/O2 and H2/O2 coaxial jet flames in a single-element combustor," Energy, Elsevier, vol. 132(C), pages 57-64.
    2. Kim, Young Hoo & Kim, Jae Hyun & Kwon, Oh Chae, 2023. "Combustion characteristics of O2/CH4 coaxial jet flames in a model combustor through their visualization and the statistical analysis," Energy, Elsevier, vol. 275(C).
    3. Kapusta, Łukasz Jan & Shuang, Chen & Aldén, Marcus & Li, Zhongshan, 2020. "Structures of inverse jet flames stabilized on a coaxial burner," Energy, Elsevier, vol. 193(C).
    4. Kim, Tae Young & Choi, Sun & Kim, Young Hoo & Ahn, Yeong Jong & Kim, Hee Kyung & Kwon, Oh Chae, 2018. "Combustion characteristics of gaseous inverse O2/H2 coaxial jet flames in a single-element model combustor," Energy, Elsevier, vol. 155(C), pages 262-271.
    5. De Giorgi, Maria Grazia & Ficarella, Antonio & Sciolti, Aldebara & Pescini, Elisa & Campilongo, Stefano & Di Lecce, Giorgio, 2017. "Improvement of lean flame stability of inverse methane/air diffusion flame by using coaxial dielectric plasma discharge actuators," Energy, Elsevier, vol. 126(C), pages 689-706.

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