Tray type deaerator, calculations 1

[pontalpha]

Hi, just looking for some tips here as I've never come across a dearator in my studies before, the closest thing would probably be an open feedwater heater. First of all I have 3 inputs to the deaerator: condensate, steam bled from a turbine and another steam input, to be honest I don't know where it's from, and most schematics I've found just show a condensate and one steam input. With an open feedwater heater all the inputs are of the same pressure, is this the case here too? I have the details of the feedwater output from the deaerator, the pressure is different from that of the input steam from the turbine, which is one of the reasons I'm confused. Basically given parameters like P, T, H, flow rate for inputs, I'm wondering how you'd go about calculating these parameters for the output feedwater. Thanks.

 

[ione]

Try this

http://www.spiraxsarco.com/resource...s/the-boiler-house/pressurised-deaerators.asp

 

[pontalpha]

Much obliged.

 

[pontalpha]

Another question, is there a way to go about calculating the oxygen content in parts per billion of the feedwater, given the properties of the condensate and the steam into the dearator and the properties of the feedwater itself? Thanks.

 

[rmw]

Here is some informative reading on the subject.

http://asme.pinetec.com/ijpgc2000/data/pdfs/15033.pdf

The ability to remove oxygen (assuming enough tray surface to heat the water) will be dependent on your operating pressure mostly.

You can also google "Henry's Law" and do some of your own calculations.

rmw

 

[pontalpha]

Thank you.