Guys,
I'm working on a gas pressure reduction re-configuration plant. The client has an outlet gas temperature problem and has asked for a solution. What I've done so far, I've simulated JT Valve in HYSYS to see what the outlet temperature would be based on the gas composition.
There are 2 heaters which heat gas upto 52 degree C before entering the regulator. Gas temperature reduces about 35 degree C after regulating and should be around 17 but in the worst case it is -4 deg C.
The distance between heaters outlet and regulator is about 40m, and the pipe has no insulation on it. I think the problem is because of heat loss along the pipe length to regulator.
I tried to simulate the heat loss in HYSYS pipe segment but couldn't do that because I haven't done it before. The data which I have are:
Gas Temp.: 52 deg C
Pipe Lehgth: 40m
Ambient Temp.: 3deg C
Gas Pressure: 10200 kPa
Gas flow rate: 5295 scmh
Gas density: 0.75 kg/m3
Gas compressibility: 0.9980
Gas viscosity: 10.8 x 10^(-6)
Cp= 2.075 kJ/kg
Pipe material = mild steel
Pipe size: 8" OD=8.63" (219.1mm) ID=7.98" (202.7mm) Sch 40, wall thickness: 0.32" (8.18mm)
Could anyboy help telling me how to calculate the gas temperature at the end of 40m pipe (pipe outlet)?
Or telling how to simulate in HYSYS.
Thank you guys.
Edited by John885, 22 September 2014 - 10:56 PM.