Deaerator is one of the key equipment of boiler and heat supply system. If the deaerator has poor deaeration capacity, it will cause serious loss to boiler water supply pipeline, economizer and other auxiliary equipment, and the economic loss caused will be dozens or hundreds times of the cost of deaerator. Therefore, the Ministry of electric power of the people's Republic of China has determined the oxygen content of the deaerator
It is suggested that the oxygen content of the deaerator should be less than 609l, i.e. the oxygen content of the feed water should be less than 609l.