To provide a steam temperature control device and its method for preventing damage to steam tubes by preventing steam temperatures from locally exceeding the limiting temperatures of heat exchangers while securing an allowance for the operation limit of a temperature reducer to improve the performance of controlling the steam temperatures during load changing operation, and to provide a power generation plant using the same.
The steam temperature control device comprises a steam temperature target value computing part 510 for determining steam temperature target values of the plurality of steam tubes 51 connected to common heat exchangers 102-104 and a spray control command value computing part 520 for calculating control command values for spray valves 109a, 109b, 110a, 110b provided in the plurality of steam tubes, respectively, in accordance with the the determined steam temperature target values.
SHIMIZU SATORU
OSAWA AKIRA
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