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Hysys Dynamic Problems

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#1 Sara77


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Posted 02 January 2021 - 05:59 AM

Hello everyone, 

I'm trying to do a dynamic simulation on Aspen Hysys. I have 3 streams: two are controlled with ratio controllers and the third has a PI flow controller. For this third stream, when I start the integrator, the valve opens at 100% and nevertheless it is uncapable of letting pass the correct quantity of flow. I tried to increase the valve Cv but the result is the same. Apparently I am doing some mistakes but I don't understand where. 

I hope to have been clear and I hope someone can help me. 




#2 Pilesar


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Posted 02 January 2021 - 09:10 AM

Dynamic simulations should mimic real life constraints. Check your pressure drop across the valve. Fluid flow always requires pressure drop. Try a larger diameter pipe, a shorter pipe, higher source pressure, lower downstream sink pressure, warmer (lower viscosity liquid) source fluid... things that would increase flow in the real world. Check your units of measure -- perhaps the 'correct quantity of flow' is unreasonable. Check your fluid phases -- is your sim fluid vapor when you expected liquid? Do you need a larger pump or compressor? (I'm not a Hysys user, so cannot offer step-by-step.) 

#3 Sara77


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Posted 06 January 2021 - 03:38 AM

Thanks for your suggestion!

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