| 摘要 |
PURPOSE:To prevent the water level of a condenser from being lowered by correcting a condensate flow rate command value, which is provided based on the water level of a degasifier and the feed-water flow rate, in accordance with the water level of said condenser. CONSTITUTION:In this device, the output signal of an adder-subtractor 13-a, which outputs a deviation between a water level signal from a degasifier water level gage 10 and a water level set value, is proportionately integrated 14-a before adding 15-a the feed water flow rate from a feedwater flow rate gage 8 as a feed forward signal to the above results, and the resultant output signal is made the command signal for the condensate flow rate. A deviation between this command signal and the condensate flow rate gage 9 is obtained by an adder- subtractor 13-b, and the opening of a degasifier water-level control valve 7 is controlled based on this deviation. In this case, further, a condenser water-level gage 17 is provided, its output is fed to an adder 15-b through a function generator 16-a, and added to the output which was proportionately integrated 14-a and the sum is fed to the adder 15-a. |
