Sizing Air Aftercooler

[Aptx4869]

Hi all

I have an air extraction line from gas turbine compressor with 250 Psi pressure & 700 F Temp. This air is to be treated with aftercooler & pressure reducing valve and then to the air tank. The Desired final parameters are 90 Psi & maximum of 200 F which will be stored in instrument air tank.

The consumption expected from the tank is 1000 Nm3/hr of Normal volume (623 SCFM) corrected to standard conditions

Looking through the internet, I could find aftercooler with around 600 SCFM , but the max temp of aftercoolers found were around 300 F.

Any idea what to do in this situation ?

If such aftercooler not available, then I plan on using 2X parallel aftercoolers with 300 SCFM which maybe available

 

[casflo]

If the expansion of the air in the pressure reducing valve were close to the isentropic, the air has an additional cooling passing through the valve.
Usually the expansion through the valves is more close to isenthalpic, but for example, if the valve has a nozzle at the valve inlet, the expansion in the nozzle is isentropic. This is the design that have many safety and relief valves.
To study this idea, you must analyze the valve design and use the air property tables.