Heat the boiler feed water to 200 degrees
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Water is pumped into the deaerator using a deaeration pump, and the water in the deaerator is heated to 100–104 degrees to remove oxygen. Water is drawn out of the deaerator using a boiler feed pump, and the water behind the outlet of this pump is heated to 200 degrees. It is directly fed into the steam drum of the waste heat boiler. What impact will this have on the waste heat boiler? Will it affect the heat exchange efficiency of the boiler?
This is generally the process for large boilers: the water coming out of the atmospheric deaerator must be heated in a economizer before entering the steam drum.
Small boilers are generally designed this way: in large boilers, the water exits the low-pressure deaerator and enters the high-pressure deaerator, where the temperature rises from 104°C to 158°C. After passing through one or two stage superheaters, the temperature reaches 240–260°C before the water enters the economizer; once preheated by the economizer, it then enters the steam drum