Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

Modelling Of Co2 Cylinder In Hysis


This topic has been archived. This means that you cannot reply to this topic.
4 replies to this topic
Share this topic:
| More

#1 rsk

rsk

    Gold Member

  • ChE Plus Subscriber
  • 116 posts

Posted 05 August 2008 - 10:58 AM

A CO2 cylinder of .014m3 initially at 150 kg/cm2 is to be consumed in a process application. Pressure & vapour/liquid fraction will vary inside cylinder as it is consumed from 150 to 10 kgsc at ambient temperature. How to simulate this case in hysis so that at each cylinder pressure phase fraction of co2 inside cylindr is calculated.
regards

#2 Padmakar Katre

Padmakar Katre

    Gold Member

  • ChE Plus Subscriber
  • 992 posts

Posted 05 August 2008 - 11:16 AM

Dear,
Configure the dynamic model. Now try if any query in that do revert back.

#3 rsk

rsk

    Gold Member

  • ChE Plus Subscriber
  • 116 posts

Posted 05 August 2008 - 01:12 PM

Thanks Mr katre
It would be good if u provide a broad outline,how to proceed.
I am new to dynamic modelling.
regards
rsk

#4 MrShorty

MrShorty

    Gold Member

  • ChE Plus Subscriber
  • 517 posts

Posted 06 August 2008 - 09:20 AM

QUOTE
How to simulate this case in hysis so that at each cylinder pressure phase fraction of co2 inside cylindr is calculated.
Simulator programs are a very useful tool in engineering, but they do not allow us to create a functional relationship where there isn't one. In the case of a pure "liquified gas" (like CO2), the cylinder pressure will be a function solely of temperature as long as there are two phases in that cylinder. 99% liquid full or 1% liquid full, the pressure will be the same (at a given temperature).

Once the cylinder pressure drops below the vapor pressure of CO2 at cylinder temperature, then you know that there is no liquid in the cylinder.

Off the top of the my head, the easiest way to know how much liquid is in a CO2 cylinder is by mass balance: know how much CO2 was put into the cylinder and know how much CO2 has been removed. From the mass balance and the pressure measurement, you can do a simple flash calculation to get the amount of liquid in the cylinder.

#5 joerd

joerd

    Gold Member

  • ChE Plus Subscriber
  • 371 posts

Posted 06 August 2008 - 09:35 AM

You can actually do this in Hysys' steady state simulator using the Dynamic Depressuring Utility. Begin with a stream that represents the initial conditions in your CO2 cylinder, and use the depressuring utility on the stream (Tools/Utilities). Read about the depressuring utility in the manual first, and tell us if there is any specific question you need answered.




Similar Topics