ガスタービンのNOx低減のための非予混合・希薄燃焼 : 排出特性

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This paper describes the low-NOx emissions of a non-premixed, direct fuel injection double-swirler burner which is being developed for high-temperature combustors of methane-fueled gas turbines and supersonic aero engines. The burner has concentric, circular and annular air channels to which swirlers are fitted. The circular channel on the burner axis is converging into a throat and then diverging downstream. Fuel is injected by a multi-hole fuel nozzle in the inner air channel. Gaseous species were measured at the flame tube exit by using a gas-sampling rake, at atmospheric pressure, at inlet air temperatures of 650,950,and 1,100 K. Emissions measurements were made for conventional swirl burners equipped with single axial swirlers of different hub sizes. The double-swirler burner achieved the lowest NOx emissions levels over the range of equivalence ratios tested while the conventional, large-hub swirler burner showed the highest NOx emissions levels the difference being larger at leaner conditions. The difference between the NOx emissions characteristics of these burners was discussed, based on the fuel-air mixing in the region near the burner exit under non-burning conditions. At 950 K inlet air and 1,800 K gas temperatures, emission indices of 0.5,1.1 and 2.2 g N0_2/kg fuel were measured for the double-swirler burner, conventional small-hub and large-hub swirler burners, respectively.
公益社団法人日本ガスタービン学会の論文
1998-06-10

ガスタービンのNOx低減のための非予混合・希薄燃焼 : 排出特性

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