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Experimental investigations on the flame structure and temperature field of landfill gas in impinging slot burners

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  • Kiani, Mehrdad
  • Houshfar, Ehsan
  • Ashjaee, Mehdi

Abstract

In the present study, structure and temperature field of flame in inclined opposite laminar premixed jets of landfill gas are investigated. Impinging of flame jets at different angles and jet-to-jet spacing pose new challenges for investigation of double-burners. The effects of key parameters such as Reynolds number (70–150), equivalence ratio (0.8–2.5), burners' intersecting angle (60°–100°), and jet-to-jet spacing (S/Dh = 3.84–9.6) were investigated by the Mach-Zehnder interferometry technique. The temperatures acquired from the 2D interferograms were compared with the thermocouple readings and the numerical simulation outcomes. The results clarified that by doubling the Reynolds number and reducing the angle between the two slot burners by 40°, the difference between maximum temperatures is 4% and 3%, respectively. These variations have a limited influence on the maximum flame temperature, but the flame configuration differs significantly, while the equivalence ratio has a notable effect on both the structure and temperature of the flame. The maximum flame temperature varied 27% by changing the equivalence ratio from 2.5 to 1. Also, the configuration and temperature of the flame and the hot zone's location are strongly affected by the distance between burners. Numerical simulations indicated that the NOx emissions are directly correlated with the maximum flame temperature.

Suggested Citation

  • Kiani, Mehrdad & Houshfar, Ehsan & Ashjaee, Mehdi, 2019. "Experimental investigations on the flame structure and temperature field of landfill gas in impinging slot burners," Energy, Elsevier, vol. 170(C), pages 507-520.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:507-520
    DOI: 10.1016/j.energy.2018.12.188
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    References listed on IDEAS

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    1. Lombardi, Lidia & Carnevale, Ennio & Corti, Andrea, 2006. "Greenhouse effect reduction and energy recovery from waste landfill," Energy, Elsevier, vol. 31(15), pages 3208-3219.
    2. Lee, Seungro & Ha, Heonrok & Dunn-Rankin, Derek & Kwon, Oh Chae, 2017. "Effects of pressure on structure and extinction limits of counterflow nonpremixed water-laden methane/air flames," Energy, Elsevier, vol. 134(C), pages 545-553.
    3. Wikramanayake, Enakshi D. & Ozkan, Onur & Bahadur, Vaibhav, 2017. "Landfill gas-powered atmospheric water harvesting for oilfield operations in the United States," Energy, Elsevier, vol. 138(C), pages 647-658.
    4. Lombardi, L. & Carnevale, E.A., 2016. "Analysis of an innovative process for landfill gas quality improvement," Energy, Elsevier, vol. 109(C), pages 1107-1117.
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    Cited by:

    1. Wei, Zhilong & Zhen, Haisheng & Leung, Chunwah & Cheung, Chunshun & Huang, Zuohua, 2020. "Effects of unburned gases velocity on the CO/NO2/NOx formations and overall emissions of laminar premixed biogas-hydrogen impinging flame," Energy, Elsevier, vol. 196(C).
    2. Zhilong Wei & Lei Wang & Hu Liu & Zihao Liu & Haisheng Zhen, 2021. "Numerical Investigation on the Flame Structure and CO/NO Formations of the Laminar Premixed Biogas–Hydrogen Impinging Flame in the Wall Vicinity," Energies, MDPI, vol. 14(21), pages 1-16, November.

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