The disadvantages of all volatilized treatment(AVT) of feedwater of a supercritical unit was summerized

the influence of AVT technology on pressure difference of the boiler and deposition of iron oxide scale in high pressure cylinder of steam turbine was analyzed

and the reasons for severe flow accelerated corrosion(FAC) in high pressure heater was also investigated. Moreover

fully-protected oxygenation treatment(OT) conversion test was carried out for feedwater of the supercritical unit

and working mechanism of the feedwater fully-protected oxygenation treatment(FPOT) technology was introduced. Furthermore

after the stable oxygenation operation of the unit

the oxygenation effects of high pressure heater water

precision of automatic oxygenation control program

operation period of condensate polishing treatment and change of iron content in water vapor system were evaluated. In addition

the advantages of feedwater FPOT technology was summerized and some suggestions for future operation were also put forward

in hope of providing reference for feedwater oxygenation in other power plants.