| 摘要 |
PURPOSE:To enable the inside temperature of a condensor to be kept constant all the time regardless of the load from a steam turbine, by controlling the rate of cooling water to be sprayed by detecting the steam rate flowing into the condenser. CONSTITUTION:A bypass steam is fed into a condenser 18 through a bypass stem pipe 16 via a flow meter 21 and bypass steam main check valve 15. The lift of a bypass steam main valve 15 corresponding to the flow rate of bypass steam is converted into an electric signal by a voltage converter 24, fed into an air-actuated valve controller 26 via a voltage/air pressure function converter 25, holding the opening of a sprayed water controlling valve 13 corresponding to the steam flow rate, conducting a control in direct porportion. With such an arrangement, the inside temperature in the condenser 18 can be kept at a constant value regardless of the load from a steam turbine. By this method, corrosion on the cooling water pipe of a condenser by water droplets, vibration of the rotor of a steam turbine rotor and damage in the condenser caused by thermal stress can be completely prevented.
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