11 replies to this topic

[chinbas]

I am interested in Gas Condensate fractionation column.

 

Feed propert is known to me. Product will be LPG, Naphtha, Kerosene, and Diesel.

 

My question is how I can define specific operating parameter

 

Like cut points (Column Top & Bottom Temperature), Pressure, (My view: Final Rigorous Distillation in HYSYS)

 

No of stage, Reflux ratio (Probably from Shortcut distillation in HYSYS)

 

I will very much appreciate if you can give me some advice.

 

Thank you

 

 

 

[Babu Prasad]

 i am surprised to  know that Natural gas condensate plant producing Kero and Diesel. is it GTL plant or only Natural gas processing plant?

[ColinR33]

Yes, normally natural gas condensate cannot be fractionated to produce LPG, kero and diesel, it doesn't have that wide a range of components (maybe your terminology is just off).  I have done a lot of NGL frac units, plus a few designs where it was an oil feed going into a frac column (topping plant) to produce kerosene, diesel and fuel oil product, but never a combination of the two.  Typically naphtha, kero and diesel are more often associated with an oil feed, but I certainly have not seen everything by any stretch. 

[NAP]

@chinbas

 

Processing condensate in a fractionator is nothing but a CDU processing extremely light crude. The design process of such a fractionator column is almost that of the CDU column.

 

Is this condensate fractionator supposed to process only condensate or sometimes a different crude?

 

Is this a pure condensate processing plant or an actual refinery where the condensate will be fed to a CDU?

 

 

@babu prasad & colin,

 

Yes, natural gas associated condensate is used as a feed to a refinery's CDU for being fractionated in LPG, Naphtha, Kero etc. In this case the objective of the field would be to recover the NGLs and reinject the natural gas back to the well to maintain pressure.

 

In UAE, one of the refineries has three CDU trains. Two CDUs processes murban crude which is a blend of 5 UAE fields while one CDU processes condensate coming off from on-shore wells in asab, habshan fields which are pumped to this said refinery by pipelines and fed to CDU 3 as crude.

 

All the three CDU train crude units are designed to handle range of crudes from condensate to murban crude.

[ColinR33]

Ah, I guess my thinking was a little too narrow, focused more on the gas processing side of things, it just didn't occur to me Chinbas was referring to a blended feed!

[chinbas]

I have attached the feed assay to clear things up

 

 

http://tinypic.com/r/28wo3e1/5

 

I cannot upload anything to the site so i have provided external link.

 

Thanks for your valuable comment

[chinbas]

Can I get some advice from any beloved person..

Edited by chinbas, 26 September 2013 - 08:15 PM.

[gegio1960]

chinbas,

what's your scope? Is it an exercise or a real project?

you should have a lot of additional crude characterization data to seriously start... and you should share them if you really want help.

(you can attach files by working on the window opened by clicking on the "more reply options" button below)

then you should have the product specificatios available... and share them.

with your D86 curve we can only roughly estimate the following vol% yields:

- LPG + gas: 5;

- naphtha: 50-55;

- kero + diesel: 40-45.

waiting for your additional input,

good luck!

[chinbas]

chinbas,

what's your scope? Is it an exercise or a real project?

you should have a lot of additional crude characterization data to seriously start... and you should share them if you really want help.

(you can attach files by working on the window opened by clicking on the "more reply options" button below)

then you should have the product specificatios available... and share them.

with your D86 curve we can only roughly estimate the following vol% yields:

- LPG + gas: 5;

- naphtha: 50-55;

- kero + diesel: 40-45.

waiting for your additional input,

good luck!

 

 

@chinbas

 

Processing condensate in a fractionator is nothing but a CDU processing extremely light crude. The design process of such a fractionator column is almost that of the CDU column.

 

Is this condensate fractionator supposed to process only condensate or sometimes a different crude?

 

Is this a pure condensate processing plant or an actual refinery where the condensate will be fed to a CDU?

 

 

@babu prasad & colin,

 

Yes, natural gas associated condensate is used as a feed to a refinery's CDU for being fractionated in LPG, Naphtha, Kero etc. In this case the objective of the field would be to recover the NGLs and reinject the natural gas back to the well to maintain pressure.

 

In UAE, one of the refineries has three CDU trains. Two CDUs processes murban crude which is a blend of 5 UAE fields while one CDU processes condensate coming off from on-shore wells in asab, habshan fields which are pumped to this said refinery by pipelines and fed to CDU 3 as crude.

 

All the three CDU train crude units are designed to handle range of crudes from condensate to murban crude.

My scope is to design the plant.

 

I have attached the feed properties for your review. Is it enough to design the plant?

 

I cannot answer some of the basic questions

1. number of theoretical stage required:

----Trial error procure to check the product quality!

----We can use Fenskey & underwood method for multi-component system but can it be used for crude also. By specifying fewer pseudo component & then regrading it as a pure multi-component system

---- In PRO II there is a shortcut distillation procedure Should it be used?

 

2. Column Pressure?

----As we know column pressure Defined by column top pressure which is defined by product quality and cooling water supply temperature. How can we calculate it?

 

3. Feed location.

 

4. Feed temperature.

 

----When there in no reboiler we have to increase the feed temperature above all of the distillate temperature. But as we are using reboiler what should be the feed temperature.

 

 

Thank you

 

Best Regards

[PingPong]

The assay you are now posting is exactly the same as the Bibiyana condensate assay that was posted earlier by processengbd

http://www.cheresour...-required-data/

but then removed again. Note the comments there that the assay is not complete.

 

Does this mean you are the same person posting under a different name? Or are you simply assuming that condensate is condensate no matter where it comes from?

 

In view of the fact that this topic is now already 8 months old I suspect that this is not a real project but merely for self education?

 

As was already indicated last year: the design principles of such a fractionator column is almost that of a CDU column.

Read http://www.cheresour...cdu-simulation/ and other topics on this forum (use search function).

 

In any case: don't waste your time with Fenske or short cut methods in any simulator.

[chinbas]

Sorry for confession. This can also mean multiple refinery based on same feed. This post when i started i was studding an existing plant  Cap 2500 BBL. Now I am to design a new plant capacity 900 BBL.

 

Thank you for your reply. I will study the post.

Edited by chinbas, 26 May 2014 - 08:44 AM.

[PingPong]

If you have seen the design of the existing 2500 BPSD plant then you know how such design normally looks like, and you can use that as a starting point for the new 900 BPSD plant.

 

Products specs determine what TBP cutpoints to use and whether you would need sidestrippers for the Naphtha and Kero products.

In Bangladesh product specs may be so sloppy that sidestrippers are not required, I don't know.

 

Plant capacity of 900 BPSD is very small compared to a CDU, so it could be that pumparounds are not use either.