Binary interaction parameter in Peng Robinson for LNG Pump Modeling

[mukosalgi]

1. I made a model handling cryogenic LNG Pump and LNG Vaporizer
2. I put the components in the compounds sheet with methane, ethane, propane, N-butane, nitrogen, water and E-glycol.
3. I choosed Peng Robison and NRTL as property package.
4. For detail modeling, please refer to the attachement.

AA. In DWSIM

1. Compounds
   a. LNG Side : C1(94%), C2(4.7%), C3(0.8%), C4(0.2%), N2(0.3%), Water(0%), E-Glycol(0%) in mole fraction
   b. GW Side : C1(0%), C2(0%), C3(0%), C4(0%), N2(0%), Water(50% Vol), E-Glycol(50%, Vol)
   b. Glycol Water will be used for vaporiztaion of the LNG by a heat exchanger(LNG vaporizer) located at LNG Pump discharge.

2. Proparty Package
   a. LNG side : Peng Robinson
   b. Glycol Water Side : NRTL

3. Results
   a. case 1 : Binary interaction parameter in Peng Robinson : keep as it is.
   Results : Two phases happen at Pump discharge

b. case 2 : Binary interaction parameter in Peng Robinson : all zero input.
Results : Single phase(naturally, it should be single phase, subcooled condition).

CC. Questions
DWSIM Model - LNG Pump and LNG Vaporizer.pdf

Q1. Please explain why this case 1 happens. (Is is a kind of Bug in DWSIM)?
Q2. It has no problem for the case 2 to calculate process data or Is there no problem to proceed with the case 2(all zero parameter input).
Q3. Can you recommend a property package for GW(vol 50%)?

Looking forward to hearing from you

Thanks.

[DanWBR]

@mukosalgi, perhaps you could share the simulation file? If you can't do so, consider trying the Private Support option.

[mukosalgi]

Please find the attachments
Case 1 : LNG Pump - Two Phases
Case 2 : LNG Pump - Single Phase
Case 2-LNG Pump - Single Phase.zip

Thanks for your help.!

[mukosalgi]

Dear DanWBR,
Could you check my reply above?
Waiting for your assisstance.
Thanks.