dynamic simulation of petroleum loading and its emission

[sandeepsailesh]

I am trying to simulate a dynamic filling of petroleum product(liquid) in a tank and would to like to study the emssion (vapour) while loading. i know its not that easy but it will be helpfull if some one has any idea whther i can do it in any porocess simulator.thanks in advance.

 

[LittleInch]

I'm not quite following this, can you explain a bit more?

Filling a tank will push out the vapour in the space above it. That vapour needs to go somewhere. but the volume fow is similar to the volume flow in so I'm not sure why you think this is complicated or needs a process simulator?

Are you trying to do a vapour from a vent with different wind speeds or something?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[sandeepsailesh]

Thankslittleinch for the response. the idea may seem easy . the tank is primarily filled with inert gas where in liquid hydrocarbon are being added for a prescribed time. i am trying to study this emission. i think process simulator not quite understand the concept of bubble formation and vapour pressure as such. because the result i was getting was not that satisfactory......

 

[LittleInch]

"bubble formation?" Is your liquid boiling?

I'm still no further forward here - you need to release more information such as:
~ product
~ temperature of product
~ boiling point
~ Vapour pressure
~ Pressure in the tank



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[MortenA]

If you have access to a dynamic simulation (e.g. HYSYS dynamic) then i would try to model this. The biggest error will be that the tool will assume that the entire space of inert will contain the equilibrium amount of vaours. This may not be the case but its a conservative assuption. Consider using an EOS that is good for vapour pressure e.g. Henrys law or something like that (if you have the constants. The amount of heavy ends will be low so dont despair if your C6+ fractions dosnt come with a constant - just set it to 0.

 

[apetri]

if you know, as you should if you wish to solve this problem, the initial compositions, volumes and flows,
the standard procedure is to recalculate mass & energy balance (including phase equilibria) at regular intervals from T1 (initial) to T2 (final),
you can solve these problems with a simulator (as suggested by Morten) or with different tools,
maybe you need to define some specific model if vapor / liquid and the different components in the mixture are not uniformly distributed, if that is your problem consider tools as Mathcad, Matlab, Excel and /or some thermo library for phase equilibria.