BOILER FEED-WATER SYSTEM BOILER PROVIDED WITH SAID SYSTEM AND CONTROL METHOD FOR BOILER FEED-WATER SYSTEM

摘要

The low temperature erosion of the water supply heating device is prevented and the cost of the water supply heating device is saved by the space saving and the lowering of the water level of the drum is suppressed. A first path 21a for supplying the water heated to the boiler water in the steam drum 11 to the economizer 2 for heat exchange with the exhaust gas from the furnace and a first path 21a for exchanging heat with the boiler water A second path 21b for bypassing the steam drum 11 and merging with the first path 21a at the confluence point X and a second path 21b for branching from the second path 21b to branch off from the steam drum 11, A temperature detection unit 24 for detecting the temperature of water between the junction point X and the economizer 2 for water supply heating and a water supply system 21 for detecting the water temperature between the junction point X and the water heater 2, And a controller 26 for adjusting the flow rate so that the water temperature detected by the temperature detector 24 is equal to or higher than a predetermined temperature that prevents low temperature corrosion of the economizer 2 for water supply heating, Respectively.