3 replies to this topic

[sherkhan_95]

Hi

I am going to simulate our natural gas sweetening plant using aspen hysys, but i hv some problems, ....

 

 

In the amine regenerator our plant reboiler pressure is 10 and temp is 240, but in simulation it gives the temp 194 at 10psi,,, is there anyone to help me in resolving this issue....???

 

 

 

[PingPong]

We can only guess, for example:

 

In the amine regenerator our plant reboiler pressure is 10 and temp is 240, but in simulation it gives the temp 194 at 10psi,

In the plant that 10 psi is 10 psi gauge (overpressure) which is 25 psi absolute. So in your simulation you also have to use 25 psi absolute.

 

Or maybe in the plant the amine concentration is higher than what you are using in your simulation.

[sherkhan_95]

Thanks Sir PingPong....

But if i putting absolute pressure value in reboiler, then should i put all absolute pressure value in my simulation? As i putted all guage values for pressures like flash thank, three phase seperator etc in our plant simulation .... and also there is no problem with amine concentration, i putted as such in the simulation as in our plant.

[PingPong]

If you entered 10 psi into the simulation then you must make sure that you specified in Hysys that pressure is psig

 

You may think that amine concentration in simulation is as in plant, but how do you know for sure? Because somebody told you that amine concentration in plant is X % ? Was that X % actually measured in the lab, or is everybody just assuming that it is X ?

 

I see 6 possible causes for the big difference in actual and simulated temperature:

- wrong pressure used in simulation

- wrong amine concentration in simulation

- wrong amine type in simulation

- wrong thermodynamic data (fluid package) used in simulation

- temperature measurement in plant is not correct (instrument is wrong)

- pressure measurement in plant is not correct (instrument is wrong)

 

It is up to you to figure out which of the above is cause of the big difference between actual and simulated temperature. We don't have access to plant data or your simulation.

And don't simply belief what people or instruments in the plant say.