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Experimental study on the flame stability and color characterization of cylindrical premixed perforated burner of condensing boiler by image processing method

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  • Najarnikoo, Mahdi
  • Targhi, Mohammad Zabetian
  • Pasdarshahri, Hadi

Abstract

In this paper, a cylindrical premixed perforated burner which is mostly used in condensing boilers is investigated by image processing methods. The burner is experimentally analyzed in its operating heating capacities (11.7–17.1 kW) and equivalence ratios (0.4–1.2). Flame properties were studied using digital images by CCD camera and color processing techniques. The method devised a procedure for finding a reliable relation between a digital image color and flame characteristics in the visible wavelength domain. It is observed that by decreasing the equivalence ratio from 1.2 to 0.4, the flame color changed from green with yellow and then blue. Besides, flame lift-off and blow off were also observed. Lower flammability limit is in the equivalence ratio of 0.44. The optimum conditions of the burner, which is defined by the stable blue flame, are found in the equivalence ratio of 0.7–0.73. Moreover, RGB analysis is used to find the stable operation of the burner. This stable optimum condition can be defined as the intersection of two intensities’ component of Red and Blue in image processing of the flame.

Suggested Citation

  • Najarnikoo, Mahdi & Targhi, Mohammad Zabetian & Pasdarshahri, Hadi, 2019. "Experimental study on the flame stability and color characterization of cylindrical premixed perforated burner of condensing boiler by image processing method," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219318250
    DOI: 10.1016/j.energy.2019.116130
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    References listed on IDEAS

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    3. Lamioni, Rachele & Bronzoni, Cristiana & Folli, Marco & Tognotti, Leonardo & Galletti, Chiara, 2022. "Feeding H2-admixtures to domestic condensing boilers: Numerical simulations of combustion and pollutant formation in multi-hole burners," Applied Energy, Elsevier, vol. 309(C).
    4. Ahmadi, Ziaulhaq & Zabetian Targhi, Mohammad, 2021. "Thermal performance investigation of a premixed surface flame burner used in the domestic heating boilers," Energy, Elsevier, vol. 236(C).
    5. Sarrafan Sadeghi, Soroush & Tabejamaat, Sadegh & Ghahremani, Amirreza & Narimani Asl, Sina, 2024. "A novel Swiss-roll counterflow micro-combustor: Experimental investigation of flame dynamic characteristics by spectroscopy and RGB image processing methods," Energy, Elsevier, vol. 299(C).
    6. Yılmaz, Semih & Kumlutaş, Dilek & Yücekaya, Utku Alp & Cumbul, Ahmet Yakup, 2021. "Prediction of the equilibrium compositions in the combustion products of a domestic boiler," Energy, Elsevier, vol. 233(C).
    7. Nagibin, P.S. & Vinogrodskiy, K. & Shlegel, N.E. & Strizhak, P.A., 2024. "Using methane hydrate to intensify the combustion of low-rank coal fuels," Energy, Elsevier, vol. 304(C).

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