| 摘要 |
PROBLEM TO BE SOLVED: To prevent boiling of a drainage in an economizer when the drainage recovered by a closed system is supplied to a boiler having the economizer. SOLUTION: While a burner 23 of a boiler 1 is combusted even during a period when supplying water to the boiler 1 is not required with no request for water supply from the boiler 1, an adjuster 31 controls an opening degree of a water-supply motor valve 12 so that the flow rate detected with a flow rate sensor 11 comes to a value which lowers the water level within the boiler 1. The drainage recovered into a drainage tank 8 is continuously supplied to an economizer 2. Thus the drainage of high temperature in the economizer 2 is prevented from residing therein to prevent the drainage from boiling in the economizer 2. COPYRIGHT: (C)2012,JPO&INPIT |
