2 replies to this topic

[Ryan process engineer]

Hi everyone,

 

I tried simulating where (200m3 at 20C, 1 bar) of pure nitrogen gas is injected into a (20m3 at 20C, 1 bar) iso tank fully filled with ethylene gas(0% liquid level). But my tank's pressure is still at 1 bar. Anyone knows what went wrong? I have calculated the mass flow of nitrogen and ethylene.

 

Density of nitrogen at 20oC 1atm = 1.165kg/m3

Density of ethylene at 20oC 1atm = 1.17kg/m3

 

 tank.JPG   46.63KB   4 downloads

[Bobby Strain]

Everything looks as it should. Now, maybe you will ask what you would like to accomplish.

 

Bobby

[pavanayi]

Why did you think the pressure of the tank would go up? Your nitrogen stream is at 100 kPaa and 20°C, Your tank is at 100 kPaa and 20°C, so the whole system is at 100 kPaa and 20°C. The pressure in the tank will not start to go up by itself. 

 

Now, consider your nitrogen is at 200 kPaa, then in reality, you can expect the pressure in the tank to go up (given the rate of Nitrogen going into the tank is more than the rate of any material being taken out of the tank).  Even then, you wont get the results you expect using the way you are doing now.