• Title/Summary/Keyword: Lean-rich Fuel Staging

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Effect of Lean-rich Fuel Staging to the Multiple Jet Flames on the Blowout Velocity (과농-희박연료가 교차로 공급되는 상호작용 화염의 화염날림에 관한 연구)

  • Lee, Byeong-Jun;Park, Kyung-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.1
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    • pp.7-14
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    • 2008
  • It has been reported that partially premixed interacting flame could be sustained till sonic exit velocities if eight small nozzles are arranged optimally and one nozzle on the center is fed small amount of fuel. But the equivalence ratios in this experiments were 20-60. In this research, experiments were conducted to know the effects of lean-rich staging in multiple jet flames on the blowout velocity. The fuel mole tractions in the fuel-air mixture, the nozzle exit velocity and the diameter between adjacent nozzles were alternatively changed. When the lower mole fraction fuel was fed to the nozzles located near the center and small amount of fuel to the center nozzle, flame was not extinguished even at the nozzle exit velocity of 200m/s. Also the interacting flame could be sustained till that velocity when four small size nozzles for lean mixture were located within the arrangement of four nozzles for rich mixture and configured optimally.

An Experimental Study of Petroleum Cokes Air Staged Burner (공기다단 적용 석유코크스 연료 전용 연소기에 대한 실험적 연구)

  • Kwon, Minjun;Lee, Changyeop;Kim, Sewon
    • Journal of the Korean Society of Combustion
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    • v.20 no.2
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    • pp.40-45
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    • 2015
  • This study is aimed to study combustion characteristics of low $NO_X$ burner using petroleum cokes as fuel. The petroleum coke, which is produced through the oil refining process, is an attractive fuel in terms of its high heating value and relatively low price. But petroleum coke is a challenging fuel because of its low volatile content, high sulfur and nitrogen content, which give rise to undesirable emission characteristics and low ignitability. The petroleum cokes burner is operated at fuel rich condition, and overfire air are supplied to achieve fuel lean condition. The low $NO_X$ burner is designed to control fuel and air mixing to achieve air staged combustion, in addition secondary and tertiary air are supplied through swirler. Air distribution ratio of triple staged air are optimized experimentally. The result showed that $NO_X$ concentration is lowest when overfire air is used, and the burner function at a fuel rich condition.