| 摘要 |
PURPOSE:To reduce power consumption by controlling the rotational frequency of a motor for a feed water pump so that the deviation between a greater value between hydraulic pressure values of a feed water and an injection waterway intake, and the discharge-side hydraulic pressure value of the feed water pump is eliminated. CONSTITUTION:A temperature detector 15 transduces the exit temperature of a secondary superheater 14 into a temperature feedback signal to control a water injection regulating valve 9 by a control part 16. A feed water regulating valve 6, on the other hand, is controlled by the element which consists of the detection signal (h) of a flow rate detector 17 equipped at the exit of the superheater 14, the detection signal 1 of a drum water level detector 18, and the detection signal (a) of a flow rate detector 4. Then, the rotational frequency of the motor 11 of a feed water pump 1 is controlled so that the discharge hydraulic pressure value of the feed water pump required for feed water control and water injection control is minimized invariably. |
