4 replies to this topic

[Daniel89]

Hi,

 

my problem: I want to ensure max 1% by weight liquid in a natural gas going into a turbine, there is no pressure or temp reduction between the knockout drum and the turbine, except pressure/temperature losses induced by pressuredrop through equipment, downstream the separator/knock out drum there is a heater which heats the gas by 5-10 °C before going into the turbine to ensure that no liquid condensates in the spool upstream of the turbine.

 

Basically I want to get rid of all free fluid on the gas at the same P,T as it enters the turbine, the heater is there for safeguarding as well as for keeping gas above hydrate equilibrium temperatures downstream the turbine.

 

When I model this in HYSYS, it shows 0% liquid by weight in the outlet, I have calculated the diameter of the vessel to be such that the gas velocity through the knockout drum is well below the water/condensate falling velocity through the gas. But is this realistic? Some carry over must be taken into account, how to reduce carry over? incre

 

So my questions: 

• Could anybody give me some useful input on how to model this in HYSYS to get realistic results
• Is is a fair assumption that a vertical knockout drum, with a diameter, that reduces the gas velocity to below the droplet falling velocity will do the trick. 
• How to avoid carry over of liquid from the vessel into the gas, increase height of vessel, install demistor at the gas outlet? 

 

Thanks for any input,

Best regards,

Daniel

[breizh]

Hi,

Consider the documents attached to support your work.

Another great resource is GPSA .

BN-EG-UE109 Guide for Vessel Sizing (red-bag.com)

 

Good Luck

Breizh

[Daniel89]

Thank you sir! The documents is very helpful, I will read a bit more, maybe I have som follow ups  

If someone have som good links regarding how to design separator in HYSYS It would also be much appreciated. 

 

Best regards,

Daniel

[breizh]

Hi,

To add to my previous post , reference from vendor ( example) you may want to consult :

https://www.eaton.co...-separator.html

 

let you submit them a specification sheet .

edit:

Vertical Vapor Liquid Separator Sizing (chesheets.com)

Good luck

Breizh

[Bobby Strain]

Are you installing a new separator? I usually bought a fuel gas conditioning package from an experienced vendor.

 

Bobby