2 replies to this topic

Hi.

I am posting my design for a vertical vapor/liquid separator

The inlet flow consists of water, oil and gas.
Oil and water rates are given.
Use a letdown valve right before inlet nozzel to get the right operating pressure.
Liquid retention time is set to be 90s
Separator must be able to handle slugs up to 13 m3
I used Hysys to establish a GOR ratio so I could find the gas rates too. I used a separator in Hysys operating at standard condisions with liquid outlet rates equal to those that where given in the task.
Because of the operating pressure of the vessel the L/D ratio is set to be between 4 and 6
I calculated K using K=0.35-0.01(P-100/100)
Sauders-brown equation gave me a vapor velocity of 0.33 m/s
Diameter of vessel is calculated to 1.8 m, but with my liquid rates and slugvolum I am outside my L/D ratio. I then sat the vessel diameter to 2.2m and I am inside the L/D ratio
HLLL is 0.15 m Low liquid level
HH 3.8 m Normal liquid level (From low to normal)
HS 4.3 m High liquid level (From normal to high)
HLIN 0.6 m Height from high liquid level to inlet nozzel(center)
HD 1 m Vapor disengagment height (From center of inlet nozzel)
HME 0.45 m Mist eliminator and height from eliminator to top.

Total height of 10 m

Inlet nozzel size calculated to be 508 mm

To calculate all of these heights I used the articel by Svrcek and Monnery published in CEP 1993.

Anyone got any comments?
I think I am just looking for a conformation that I am on the right track or not.

And if anyone got any comment about my pipe sizing problem in Hysys I would be most greatful, or is it a fault within Hysys?

KurtO

[Art Montemayor]

Arvind:

Go to:

http://www.cheresour...x...

and download the Excel workbook that shows and teaches you how to design a vapor-liquid separator. The method shown is what is used to design such separators in industry. Simulator programs such as Hysys are not used for such design because that is not their purpose. However, a simulator can be used to obtain some of the basic data required - such as densities of complex mixtures.

In the future, please do not "pirate" some one else's thread by injecting your query or problem in it. Start your own thread so that specific attention and help can be directed to your need and avoid confusion and mix-ups with other people's queries and responses.

I hope this helps you resolve your vapor-liquid separator problem. You can use the "Search" function in this forum and find helpful threads covering other subjects as well.