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
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Modelling Of Co2 Cylinder In Hysis
Started by rsk, Aug 05 2008 10:58 AM
4 replies to this topic
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#1
Posted 05 August 2008 - 10:58 AM
#2
Posted 05 August 2008 - 11:16 AM
Dear,
Configure the dynamic model. Now try if any query in that do revert back.
Configure the dynamic model. Now try if any query in that do revert back.
#3
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
It would be good if u provide a broad outline,how to proceed.
I am new to dynamic modelling.
regards
rsk
#4
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
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.
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