A-18 LNG焚きガスタービン燃焼器の要素技術開発(燃焼器開発,一般講演)

概要

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Low NOx combustor for 25MW class gas turbine, which is composed of a burner with a lot of coaxial fuel/air nozzles, has been developed. This burner is named "Cluster Nozzle Burner". In this study, the combustion properties of its elemental burner whose fuel nozzles are put in three circumferences were surveyed. As the fuel ratio of fuel nozzles on the 1st circumference was turned down to put flow rate distribution into uniform, NOx emission was reduced. But the flame was lifted or the combustion dynamic increased sharply by the flame anchor on the whole surface of swirl plate before becoming uniform. For improving the combustion performance, the swirl plate was converted from flat shape into convex shape and its surface was inclined at 45 degrees angle. By this shape, the flame anchor on the whole surface was prevented and NOx 2.5ppm(15%O_2) was marked with LNG at the condition that pressure was 1.5MPa, combustion temperature was 1490℃.
公益社団法人日本ガスタービン学会の論文
2009-10-21