| 摘要 |
PURPOSE:To prevent the damage of valve devices due to thermal expansion of a fuel piping system, by a method wherein a bypass piping through which delivery air from a compressor is fed to a combustor is installed in a gas turbine chamber, and the feed of compressed air is practicable during completion of a purge in a fuel piping running to the combustor. CONSTITUTION:In a title device wherein two kinds of gas fuels of the one being LPG and the other being LNG are selectively fed to a combustor 4, situated in a gas turbine chamber 25, from compartments 18 and 19 of a fuel valve through fuel pipings 8 and 12, respectively, two sets of air purge valves 22a, 22b and 23a, 23b (22 and 23) are disposed in series in a compressed air piping 24 in the gas turbine chamber 25. Bypass pipings 31a and 31b through which the intermediate parts of the air purge valves 22 and 23 are connected to the secondary sides of check valves 29 and 30 located in fuel pipings 8 and 12 in the gas turbine chamber 25 are provided, and bypass valves 32a and 32b for purge are located in the bypass pipings. The intermediate part of the air purge valves 22 and 23 is connected to the suction side of a ventilating fan 26 through blow-off pipes 27a and 27b. |
