| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed water controller to suppress operation exceeding allowable shaft torque even when pump efficiency is eminently reduced and perform safe operation of a feed water pump, in a feed water control device to control a flow rate of a feed water pump by controlling a steam regulation valve. SOLUTION: This feed water controller comprises a regulation valve opening computing means 7 to determine a first steam regulation opening signal 51 from a number of revolutions command signal 1 and a number of revolutions detecting signal 2, a steam flow rate converting means 11 to convert the number of revolutions detecting signal 2 into an allowable steam flow rate signal 52, a steam regulation valve opening signal converting means 12 to covert the allowable steam flow rate signal 52 into a second steam regulation valve opening signal 53, and a low value selecting means 13 to compare the first and second steam regulation valve opening signals 51 and 53 with each other and output one, being lower, of the values whichever it may be.
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