Hello Everyone,
In our Gas sweetening Unit C2+ liquid is produced from available natural gas at around 25 Kg/CM2G pressure. We then store the liquid hydrocarbon to 5 of our C2+ sphere to cater it as feed to Ethylene Cracking unit (ECU) at 30 Kg/Cm2G pressure (Temperature of sphere are around 32 Deg.C) via pump. Then the liquid pressure at ECU led down to 8 Kg/Cm2G by control valve, and due to which the liquid temperature falls to -20Deg.C (approx). This cold liquid then is used as a heat exchanging medium in Tertiary Refrigeration unit , before being feed to cracking furnace pre heater. The composition(wt%) of C2+ liquid is as follows :
C1: 1.4%
C2: 63.83%
C3 :21.21 %
I-C4: 4.78%
n-C4 :4.76%
n-C5 : 1.1%
C6+: 0.97%
Specific gravity: 0.4333
Now I want to calculate the isenthalpic expansion of the liquid feed (feed condition , feed VLE composition etc) in MS Excel for personal interest only. It can be done rigorously by PR EOS or any other EOS.
I have found some reference to do so in DWSIM manual where they have mentioned about 'Goldzberg correlation' for the same. But I have not found any more reference about the correlation in internet or anywhere.
If you have any extra reference about the equation please share. Also if anyone having Excel sheet or algorithm for such isenthalpic expansion calculation, please share.
With regards,
Bitan729
Edited by Bitan729, 13 September 2021 - 04:20 PM.