Boiler supply method of water supply for the make-up water

摘要

PROBLEM TO BE SOLVED: To effectively inhibit corrosion and scale formation in a steam boiler regardless of addition of agents to the boiler feed-water.;SOLUTION: The make-up water is treated by a water softening device 53 having a group of resin units including a plurality of resin units filled with sodium cation exchange resin, a cross-flow type filtration device 55 having a nano filtration film, and a deoxidizing device 56, and the deoxidized softened water from which corrosion-accelerative ion component such as chloride ion is removed, is stored in a water storage tank 40 as the boiler feed-water. A concentration of hard components, acid consumption (pH 4.8) and a water temperature of the make-up water are respectively measured between the water softening device 53 and the filtration treatment device 55, the resin unit is switched to another one in the group of resin units when the concentration of hard component is over a prescribed concentration, the blowing amount from the filtration treatment device 55 is decreased when the acid consumption (pH 4.8) is less than a prescribed value, and the make-up water is passed through the deoxidizing device 56 while lowering a flow rate of the make-up water when the water temperature is lower than a prescribed temperature.;COPYRIGHT: (C)2008,JPO&INPIT