| 摘要 |
PURPOSE:To keep thermal stress in a rotor on a high pressure exhaust stage and the strength of a blade to sufficiently secure levels by effecting opening operation of a steam damping valve placed between a high pressure turbine and a condenser in opposition to that of a steam adjusting valve. CONSTITUTION:Steam supply to a high pressure turbine 35 is interrupted upon starting the turbine and steam from the high pressure turbine 35 is fed to a condenser 45 through a steam damping line 64 whereby the inside of the high pressure turbine 35 is forced to form a vacuum, while reheat steam is supplied to a reheat steam turbine 42 to drive it. Then, when the high pressure turbine 35 is subjected to any load, opening operation of a steam damping valve 63 is effected in opposition to that of a steam adjusting valve 34, and is closed gradually in accordance with opening of the steam adjusting valve 34. Thus, temperature in high pressure exhaust upon starting the turbine can be prevented from being increased as well as thermal stress of a rotor on a high pressure exhaust stage and the strength of a blade can be kept on sufficiently secure levels. |
