A-14 低NOx燃焼器用コンセントリックバーナーの開発(燃焼・燃焼器III,一般講演)

概要

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While the industry has made substantial reductions in carbon monoxide, unburned hydrocarbons and invisible smoke emissions, NOx has been a more difficult pollution target because higher engine operating temperatures control other pollutants. NOx production increases exponentially as temperature increases. The highest levels occur in a stoichiometric transition from fuelrich to fuel-lean conditions in the combustion chamber. The concentric burner solution is to pre-mix air and fuel before combustion to assure even burning at lower temperatures. The concentric burner has two annular fuel/air swirlers. A central swirler acts like a pilot light that is sufficient to power the engine for idle and taxi operations. An outside main swirler encircles the first and kicks in with throttle advance for takeoff, climb and cruise. In descent, the main swirler is inactive. The concentric burner proved 63% NOx reduction from the current ICAO regulation by using a multi sector unit. The lower combustion temperatures also will improve the engine's maintenance demands.
公益社団法人日本ガスタービン学会の論文
2007-09-01