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The membrane deaerator consists of membrane deaerator, deaerator water tank and accessories. It is a new type of thermal deaerator, which can be used for constant pressure, sliding pressure and negative pressure operation. It has the characteristics of high dissolved oxygen content in inlet water, low inlet water temperature and large make-up water. It is suitable for deaeration of various power station boilers, industrial boiler feed water, make-up water of thermal power plant or hot user water. Compared with other types of deaerator, membrane deaerator has the advantages of good deaeration effect, strong adaptability, good stability and energy saving.