Deaerator operating pressure at 40 bar?
Deaerator operating pressure at 40 bar?
(OP)
I am involved with the design of a new steam generating plant consisting of two 225 tph boilers with 102 barg and 320degC outlet steam condition. The main return condensate flow [Stream 1] from the associated process plant can be up to 240 degC, making up 85% of the boiler feedwater flow. The make-up water and other return condensate streams [Stream 2] combine to a temperature of about 100 degC. Stream 2 is deaerated, whilst Stream 1 is not (excellent quality with no chance of contamination). After deaeration the two streams are combined in a pressured condensate vessel pegged at deaeartor operating pressure. The deaerator pressure needs to be just higher than the saturated steam pressure of Stream 1 [about 250degC], otherwise flashing will occur in the condensate vessel.
My question is: Is there likely to be any problems with deaerating Stream 2 from 100degC up to 250degC ?? I'm used to a differential temperature of about 40 degC, but 150 degC is way higher than I'm comfortable with.
My question is: Is there likely to be any problems with deaerating Stream 2 from 100degC up to 250degC ?? I'm used to a differential temperature of about 40 degC, but 150 degC is way higher than I'm comfortable with.





RE: Deaerator operating pressure at 40 bar?
RE: Deaerator operating pressure at 40 bar?
The alternative is to operate the Deaerator at 15.4 bara, with a resultant feedwater temperature of 180 degC (the final temp of un-deaerated return condensate (Stream 1) mixed with deaerated condensate and make-up water (stream 2). However the process plant engineers believe there are some process concerns with their systems if this alternative is adopted (an alternative they have been working on for some time). I sure don't want them solvig thier problems at the expense of the boiler plant design.
RE: Deaerator operating pressure at 40 bar?