3 replies to this topic

[tomr91]

Hello everyone,

 

I am working on a dynamic simulation that involves an instantaneous transition between two streams of feedstock. I understand that in the real world, the valves are controlled by a PID controller. However, in my case, the gradual character of the valve movement is irrelevant, and a transition between logical zero and logical one (valve opening) can be assumed to happen instantly.  How can this immediate change be implemented in Aspen HYSYS?

 

Thanks in advance

[Pilesar]

Why not just use large, fast valves in the simulation? Large enough and fast enough should be good enough.

[tomr91]

Why not just use large, fast valves in the simulation? Large enough and fast enough should be good enough.

Hi Pilesar,

I was wondering if you have an example simulation file demonstrating this?

Specifically, I'm interested in how changing feed streams affects downstream unit performance (e.g., phase behavior, reaction yield, or separation efficiency). If you have a sample case or any tips on setting up dynamic composition changes, I’d really appreciate your insights!

Thanks in advance!

[Pilesar]

My dynamic simulation work was many years ago with different software and I have no example file for you. Unless there is much more to your case study than described, steady state simulation seems like it would provide most of the answers you seek. Dynamic simulation would not add much.