| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a preheating method for a main steam stop valve used in a thermal power plant equipped with a plurality of boilers, capable of raising the metal temperature safely and efficiently when a hydraulic test is conducted in winter or the like. <P>SOLUTION: Stored water in a deaerator 5 is turned into hot water by heating with an auxiliary steam in another boiler, and the obtained hot water is driven by a boiler water supply pump 6 to flow to a main steam pipe 17 from a high-pressure water supply heater 7, an overheater spray valve 8, and a desuperheater 9, and is used for preheating the main steam stop valve 12. The hot water having undergone heat exchange with the main steam stop valve 12 flows into a blow tank 18 via bypass pipes 20a and 20b to be discharged outside the system. <P>COPYRIGHT: (C)2012,JPO&INPIT |
