Method for adjusting dissolved gases in boiler feed water

The invention discloses a method for adjusting dissolved gases in boiler feed water. The steam of a boiler forms condensed water after the work of a steam turbine; the condensed water flows out of a condenser and enters a polishing apparatus through a condensed water pump; the condensed water is subjected to degassing or oxygenation treatment by a membrane degasser or membrane oxygenator, wherein the membrane degasser is connected with a vacuum pump, and the membrane oxygenator is connected with an oxygen bottle; the treated water enters the boiler through a low-pressure heater, a water feed pump and a high-pressure heater; and the membrane degasser and the membrane oxygenator are fiber membrane contactors. According to the adjusting method, a fiber membrane is adopted as a gas-liquid exchange interface; according to different water qualities, membrane degassing treatment is carried out in AVT (all-volatile treatment) working condition, and membrane oxygenation treatment is carried out in OT (oxygenated treatment) working condition; and the gas content of the boiler feed water can be quickly and accurately adjusted, the flow accelerated corrosion (FAC) is avoided, and the operation safety of the unit is improved.