WATER SUPPLY PIPING CONNECTION STRUCTURE, GAS TURBINE COMBINED CYCLE POWER GENERATION PLANT WITH THE SAME, AND WATER SUPPLY PIPING COOLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a water supply piping connection structure which eliminates the risk of leakage of supply water even if a water supply temperature suddenly goes down.SOLUTION: In a water supply piping connection structure 30A, flange parts 32a and 34a of water supply piping in which supply water guided from a supply water heating economizer of an exhaust gas boiler flows are connected by a plurality of bolts 40. The water supply piping connection structure comprises a cover part 50 that covers the flange parts 32a and 34a from the outside, and cooling air introduction piping 54 for introducing cooling air and cooling air exhaustion piping 60 for exhausting cooling air are connected to the cover part 50. A blower 56 is provided in the cooling air introduction piping 54 for pumping a cooling fluid into the cover part 50, and the blower 56 is started based on a stop signal of a gas turbine.SELECTED DRAWING: Figure 2