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, the water supply heating device is arranged in a cost-saving manner by reducing the space, 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.;