| 摘要 |
PROBLEM TO BE SOLVED: To improve specific power as well as heat efficiency of a gas turbine by effectively utilizing air compressed by heat exchanging by forming a combustor outer wall as a water cooled outer wall unit assembly structure of a spiral welding structure water cooled outer wall including a leading water pipe. SOLUTION: A water cooled outer wall unit 52 including at least one spiral water leading pipe 1 is formed as one unit capable of assembling by arranging flanges 53 on its both ends, and a plurality of water cooled outer wall units 52 are connected to each other, and is formed as a major part of a combustor capable of increasing pressure in a high level and capable of shortening. A combustor external box part 25 including a welding structure is arranged apart from outward of a radial direction of the water leading pipe 1, the flanges 53 are opened to its both ends, and the units 52 are connected to each other. The combustor external box part 25 is arranged outward of the radial direction of the water leading pipe 1 or on a nearly center part of a radial direction, the flanges 53 are opened to its both ends, and the units 52 are connected to each other. It is thus possible to increase a heating surface area of a device which serves as both a combustor and a heat exchanger having a high pressure ratio under a supercritical steam condition or less.
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