| 摘要 |
PURPOSE:To prevent occurrence of errosion in a steam turbine, by adjusting the opening degree of a steam turbine bypass valve in accordance with output signals from super-heat temperature detecting devices, and as well by providing a pressure regulating device for controlling the pressure of main steam. CONSTITUTION:High temperature exhaust gas discharged from a gas turbine 4 is fed into a waste heat recovery boiler 6. A main steam pipe 17 connecting between a superheater 7 and a steam turbine 12 is connected with a pressure detector 18 and a temperature detector 19. Output signals from superheat temperature detecting devices 18 through 22 are delivered to a pressure regulating device 23 which adjusts in accordance with these signals the opening degree of a steam turbine bypass valve 15 to control the pressure of main steam. With this arrangement occurrence of errosion in the steam turbine due to damped steam may be surely prevented. |
