| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust heat recovery boiler capable of protecting even a thick wall portion of a superheater. SOLUTION: This exhaust heat recovery boiler comprises a first detecting means 31 for detecting one of superheated steam pressure, a steam drum can internal fluid temperature and a steam drum metal temperature in starting, a second detecting means 32 for detecting a superheater steam temperature or a superheater thick wall portion metal temperature in starting, a first percentage change calculating means 50 for calculating the percentage change of a value detected by the first detecting means 31, a second percentage change calculating means 60 for calculating the percentage change of a value detected by the second detecting means 32, and a control means 53 for adjusting an opening of a turbine bypass valve 22 in reference to the first percentage change and the second percentage change. COPYRIGHT: (C)2008,JPO&INPIT
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