Experimental Investigation of Air–Fuel Mixing Effects on Flame Characteristics in a Direct fired Burner

Cheolwoo Lee, Insu Kim and Junggoo Hong
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Cheolwoo Lee: School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea
Insu Kim: Environmental & Energy Planning Team Hyundai Steel, Dangjin City 31719, Korea
Junggoo Hong: School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Korea

Energies, 2021, vol. 14, issue 12, 1-12

Abstract: The length and pattern of air–fuel mixing plays a significant role in the uniformity, flame temperature, and emission characteristics, which can lead to a superior product quality in a non-oxidizing direct fired burner for a cold-rolled steel plate furnace. In this study, a diffusion-flame-type burner and partially-premixed-type burner were experimentally investigated to understand their effects on flame shape, flame temperature, and exhaust gas characteristics. With this aim, fuel nozzle size, nozzle hole number, fuel injection angle, and mixing distance of fuel and air were varied during the experiments. Computational fluid dynamics simulations were also performed to investigate the air–fuel mixing state for a nozzle-mixed burner and a partially-premixed burner. The results show that the flame temperature of the partially-premixed burner increases by up to 26 °C on average compared to that of the nozzle-mixed burner. It is also shown that the mixing distance plays an important role in the flame temperature of the partially-premixed burner. In addition, the residual oxygen concentration and volume ratio of CO/CO 2 in the flue gas of the partially-premixed burner exhibit lower concentrations compared to those of the diffusion flame burner.

Keywords: non-oxidizing direct fired; diffusion-flame-type burner; premixed flame burner; flame temperature; exhaust gas characteristics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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