Turbine facility and water treatment method for heater drainage water

Abstract

Provided are a turbine facility, in which iron oxide particle scale that adheres to inner surfaces of boiler tubes and impedes heat transfer can be efficiently removed from heater drainage water; and a water treatment method for heater drainage water in the turbine facility. The turbine facility includes a boiler 9 , steam turbines 12 and 16 , a condenser 1 , feedwater heaters 5 and 8 which are interposed in water supply lines 4 and 6 that supply condensate condensed by the condenser 1 to the boiler 9 , and in which part of steam supplied from the steam turbine 12 to a repeater is extracted as extraction steam, and the feedwater is heated using the extraction steam, and a filtration device 19 in which heater drainage water discharged from the low-pressure feedwater heater 5 is filtered and supplied to the water supply system for recovery. The filtration device 19 includes a filter having a pore size of 1 to 5 μm.

1 . A turbine facility comprising:
 a boiler in which steam is generated by heat from a heat source;   a steam turbine which is driven by the steam of the boiler;   a condenser which condenses steam from the steam turbine;   a water supply system which supplies condensate condensed by the condenser as feedwater to the boiler side;   a feedwater heater which is interposed in the water supply system and in which part of steam supplied from the steam turbine to a reheater is extracted as extraction steam, and the feedwater is heated using the extraction steam; and   a filtration device in which heater drainage water discharged from the feedwater heater is filtered and supplied to the water supply system for recovery,   characterized in that the filtration device includes a filter having a pore size of 1 to 5 μm.   
     
     
         2 . The turbine facility according to  claim 1 , characterized in that, in the filtration device, the total amount of the heater drainage water is filtered and supplied to the water supply system. 
     
     
         3 . The turbine facility according to  claim 1 , characterized in that the heater drainage water is low-pressure heater drainage water. 
     
     
         4 . A water treatment method for heater drainage water in a turbine facility comprising:
 vaporizing and superheating feedwater in a boiler by heat from a heat source;   driving a steam turbine by means of generated steam;   condensing steam discharged from the steam turbine with a condenser to form feedwater;   supplying the feedwater to the boiler side;   heating the feedwater in a feedwater heater using extraction steam extracted from part of steam supplied from the steam turbine to a reheater; and   filtering heater drainage water which is generated by cooling the extraction steam in the feedwater heater so as to be recovered to a water supply system,   characterized in that the heater drainage water is filtered with a filter having a pore size of 1 to 5 μm.   
     
     
         5 . The water treatment method for heater drainage water in a turbine facility according to  claim 4 , characterized in that the total amount of the heater drainage water is filtered with the filter and recovered to the water supply system. 
     
     
         6 . The water treatment method for heater drainage water in a turbine facility according to  claim 4 , characterized in that the heater drainage water is low-pressure heater drainage water.