Boiler Apparatus

Abstract

To suppress corrosion of heat transfer tubes of a boiler under an influence of water, there is provided a boiler apparatus equipped with a unit for gathering boiler water ( 3 ) in a boiler 2 and a unit for adding the gathered boiler water ( 4 ) to supply water that has not been supplied to the boiler ( 2 ) yet. With this construction, boiler water with concentrated silica, which is an alkaline and corrosion preventive ingredient, is gathered from the boiler ( 2 ) in combustion by the boiler water gathering unit ( 3 ). The gathered boiler water is added to supply water stored in a supply water tank ( 15 ) by the boiler water adding unit ( 4 ), and this supply water is adjusted to have a water quality allowing suppression of corrosion of a connecting portion between a lower header ( 6 ) and water tubes ( 7 ) of the boiler ( 2 ).

1 . A boiler apparatus, comprising:
 a boiler;   means for gathering boiler water in the boiler; and   means for adding the gathered boiler water to supply water that has not been supplied to the boiler yet.   
   
   
       2 . A boiler apparatus, comprising:
 a boiler;   an economizer for pre-heating supply water for the boiler by exhaust gas from the boiler;   boiler water gathering means for gathering boiler water in the boiler; and   boiler water adding means for adding the gathered boiler water to supply water that has not been supplied to the economizer yet.   
   
   
       3 . A boiler apparatus according to  claim 1  or  2 , wherein the gathered boiler water is added to a supply water tank for storing supply water for the boiler.