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[connex]

I have been attempting to create a very basic HYSYS simulation of a natural gas processing plant for an independent study. It does not need to be super detailed and comprehensive - just needs to show the basic steps.

 

I have been trying to incorporate a TEG regeneration cycle in my dehydration process, but I cannot get it to converge despite many column configurations and different column specifications. My main issue is the specification that the reboiler operates at 204 C, which is necessary to avoid any TEG degradation. I've tried using a column with both a reflux condenser and reboiler, just a reboiler, multiple stages, one stage, specifications on TEG mole fraction in the bottoms, and nothing has seemed to work. I want to keep this pretty basic and would rather not incorpate a stripping section after the reboiler or any sort of advanced process (vacuum regen, Stahl column, Drizo, Coldfinger, etc.).

 

I've attached the simulation file and any help would be greatly appreciated!

Attached Files

•  NG Ops Plant SIM ZIP.zip   890.35KB   8 downloads

[SidRah]

I have been attempting to create a very basic HYSYS simulation of a natural gas processing plant for an independent study. It does not need to be super detailed and comprehensive - just needs to show the basic steps.

 

I have been trying to incorporate a TEG regeneration cycle in my dehydration process, but I cannot get it to converge despite many column configurations and different column specifications. My main issue is the specification that the reboiler operates at 204 C, which is necessary to avoid any TEG degradation. I've tried using a column with both a reflux condenser and reboiler, just a reboiler, multiple stages, one stage, specifications on TEG mole fraction in the bottoms, and nothing has seemed to work. I want to keep this pretty basic and would rather not incorpate a stripping section after the reboiler or any sort of advanced process (vacuum regen, Stahl column, Drizo, Coldfinger, etc.).

 

I've attached the simulation file and any help would be greatly appreciated!

Hi Connex,

I managed to converge the simulation with few modifications, Check the basis of the fluid package of stream 8 as it is set to basis 1, basis 2 is your glycol package, by setting it to basis 2 the temperature of the rich glycol becomes 36.29 instead of -20 which is more reasonable. then fix the delta T in the E-101 accordingly. and finally in T-101s reboilers pressure drop, I changed it to 1 kPa and it converged, I changed it back to 10 kPa and it was still converged, so I supposed it was the basis of the fluid package that was messing with the convergence.