Feedwater Temperature Rise in a Deareator For Boiler Feedwater

[RJB32482]

Hello,

Is there a rule of thumb on how much temperature rise you would expect in a deaerator for boiler feedwater to and from the deaerator?

I'm assuming some of the heat from deaeration gets transferred to the incoming feedwater.

Thanks in advance.

 

[bimr]

For the typical industrial deaerator, a steam pressure reducing valve controls steam for heating incoming water at the deaerator to saturation temperature. Normally, the deaerator operates at 5 psig; exiting boiler feedwater is 227°F.

When condensate return water is 227°F or above, it is returned directly to the deaerator storage tank. Any condensate
below 227°F must be deaerated. Incoming makeup water is typically in the range of 55-70 °F.

Released dissolved oxygen and carbon dioxide gases along with a negligible steam loss of approximately one tenth of 1% are vented out of the roof of the deaerator.

 

[kasiviswa]

Normally Deaerator water is at saturation temperature corresponding to the operating pressure.