| 摘要 |
PURPOSE:To prevent overheat of a high pressure turbine due to an air loss, by controlling a ventilator value in a pipe line between an exhaust part of the high pressure turbine and a condenser in accordance with thermal stress of a rotor at intermediate pressure starting of high and intermediate pressure turbine devices. CONSTITUTION:When steam is supplied only to an intermediate turbine 9 to start a steam turbine device, a ventilator valve 7 provided in a pipe line communicating an exhaust part of a high pressure turbine 2 to a condenser 13 is opened to hold the inside of th turbine 2 almost to a vacuum and prevent overheat due to an air loss. Here thermal stress of rotor is calculated in an arithmetic unit 21 by signals from a temperature sensor 18 and pressure sensor 19 provided to the exhaust part of the turbine 2 and compared with a preset value in a comparator 23 to feed a valve operating and closing signal from a transmitter 24, and the valve 17 is controlled to an adequate opening to prevent the turbine 2 from overheat due to an air loss while heat the turbine to adequate temperature. |
