| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas turbine blade cooling air generating system capable of surely supplying low-temperature air for cooling blades and improving efficiency of a gas turbine. SOLUTION: Air at about 490 deg.C, which has been bled from a compressor 11, is first divided into two systems of a heat exchange 14 for heating fuel and a low-pressure steam generating heat exchanger 15. The air temperature lowers in each of the heat exchangers 14, 15, and enters a hot water generating heat exchanger 16 for driving absorption refrigerating machines to be cooled more. In the heat exchanger 16, hot water is produced by heat exchange with the air. The hot water is used as a heat source for absorption refrigerating machines 19, 20. The air from the heat exchanger 16 enters a heat exchanger 17 for heating fuel, and raises the temperature of fuel. The outlet air enters a heat exchanger 18, which is cooled by cold water of the absorption refrigerating machines, and cooled down to about 15 deg.C. The air is pressurized by the compressor 20, and the generated heat is utilized as a heat source for the low- pressure steam generating heat exchanger 15. Then the air is cooled by cooling water of an absorption refrigerating machine 21 and supplied to the gas turbine.
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