3 replies to this topic

[Vegeta]

Dears,

We are working on a project in which that there is a maldistribution of the overhead gas of an atmospheric tower over the air cooler bays. In addition to that, washing water is injected into the overhead gas pipe (header) before it reaches the air cooler. So, we have a 3 phase flow into each branch, out of this header, that goes to a spesific bay. Also, after the air cooler condenses the gas partially the branches are combined into a single header pipe. My qustion is that can hysys simulate the hydraulic of such system? can it calculate how much gas, water & hydrocarbon gas is going into each bay? if yes, how? if no, what is the software that can handle such situation?

Regards,

[Bobby Strain]

I always designed wash water to each bay.

 

Bobby

[gegio1960]

Vegeta,

you should provide a better description of your system; for instance:

- size of the ovhd line and relevant branches

- size of the ww pipes

- number and configuration of the branches

- are the branches symmetrical and sloped towards the AC inlet?

- P&ID, iso, sketch of the system

- flowrates and conditions (T, P) of ovhd vapours and ww

- presence and configuration of injection devices and distances from branch point

- configuration of the outlet lines

- any other info you can think helpful to really explain your problem (in order to obtain a solution)

Anyway, if the system has been correctly engineered and realized, the maldistributions could have been originated by dirt/fouling.

Good luck

[colt16]

Dears,

We are working on a project in which that there is a maldistribution of the overhead gas of an atmospheric tower over the air cooler bays. In addition to that, washing water is injected into the overhead gas pipe (header) before it reaches the air cooler. So, we have a 3 phase flow into each branch, out of this header, that goes to a spesific bay. Also, after the air cooler condenses the gas partially the branches are combined into a single header pipe. My qustion is that can hysys simulate the hydraulic of such system? can it calculate how much gas, water & hydrocarbon gas is going into each bay? if yes, how? if no, what is the software that can handle such situation?

Regards,

 

Maldistribution of the gas occurs when the pressure drop of one side is too high, Thus the fluid preferentially prefers to flow in a certain direction (the path with the lower pressure drop). This can be resolved by increasing the pipe size to make the pressure drop equal or negligible difference. 

 

Most of your problems should be at the inlet so I don't think use of HYSYS is necessary. 

Edited by tanykiat, 01 January 2015 - 10:18 PM.