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