Does the regenerated rich liquid flash tank require regular nitrogen pressure supplementation?
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This post was last edited by liaifeng on 2018-9-10 at 20:20. The liquid-rich flash tank in my setup does not build pressure without nitrogen being introduced, so I regularly fill it with nitrogen to maintain a pressure of around 0.1 MPa. I would like to know how others in this community handle this situation
If the hydrogen sulfide content in the rich liquid is low and no gas is produced during flashing, then nitrogen must be added to force out the gas!
No pressure is generated without nitrogen injection, and there are several factors involved. Firstly, the flash tank is used to prevent the rich liquid from containing hydrocarbons, which could cause it to foam; therefore flashing is necessary. The fact that no pressure is generated indicates that no hydrocarbons are present, which is good. However, if no nitrogen is used to maintain a certain pressure, then a larger amount of hydrogen sulfide will evaporate from the rich liquid, which is not desirable. If nitrogen must be continuously injected, there might be some problem – perhaps consider the possibility of leakage in the control valve. It’s definitely incorrect to fail to maintain the required pressure
Isn’t a flash tank used for flashing light hydrocarbons? It’s fine if the pressure in the flash tank is a bit lower