| 摘要 |
PROBLEM TO BE SOLVED: To reduce NOx by lowering the temperature of exhaust gas by increasing the volume of air for combustion, preventing the occurrence of insufficient cooling of a gas turbine. SOLUTION: In the tip section 16 of a pilot nozzle 11, the fuel having flowed downstream passing through a center pipe 18 collides with a tip plate 19, and then flows upstream along a back-flow guide pipe 19a which extends upstream from the tip plate 19 and then collides with an inner plate 21 and changes its flow direction downstream, and injected from an injection hole 23 passing between the back-flow guide pipe 19a and the outer guide pipe 22. Therefore, the tip section of the pilot nozzle 11 can be cooled by fuel itself, for eliminating the need for introducing a part of compressed air for cooling it, and by as a result, air utilized for combustion can be increased, resulting in reduction of NOx.
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