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#1 Sevail

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Posted 25 September 2016 - 06:24 AM

Dears

 

In case of considering a common hydtrotreater for kerosene and diesel cuts in downstream of the crude atmospheric distillation unit, it is possible to have the below configurations in the crude atmospheric distillation unit:

 

1)      A side stripper for draw-off of kerosene and diesel as one cut

2)      One side stripper for kerosene cut and another side stripper for diesel product 

 

Although In the first case, fixed cost (for example: lower tower height, only one side stripper, instrumentation, number of side stripper bottom pumps) is less than that for the second case, in the first case duty of charge heater and overhead condenser will be more than that in the second case (more operating cost comparing to second case) . In the second case there are two side strippers and two pump-arounds , therefore heat recovery in heat exchanger train is more than that in the first case .

I think in the first case, if heat recovery is kept the same as that in the second case, the  tower diameter in the pump around section for the mixture of kerosene and diesel draw-off will increase dramatically.

It would be highly appreciated if you shared your technical points/experience with me.

 

 Thanks in advance.



#2 Napo

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Posted 19 October 2016 - 08:14 AM

Sevail,

 

I have a question: Do you need the kerosene and diesel streams individually after hydrotreater?

 

Napo.



#3 Sevail

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Posted 11 December 2016 - 06:10 AM

Sevail,

 

I have a question: Do you need the kerosene and diesel streams individually after hydrotreater?

 

Napo.

Yes. Kerosene and Diesel will be separated in hydrotreater.



#4 gegio1960

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Posted 12 December 2016 - 03:39 AM

Answers could be different depending upon the quantities/qualities involved in the process.

For instance:

1) feed to CDU is a condensate or a "full" crude?

2) capacity of the CDU?

3) quantities of gasoil and kerosene?

Good luck!



#5 colt16

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Posted 13 December 2016 - 09:57 AM

There is a design by JGC called the JUST refinery. You can check out the details at their website.
In their concept it is not just Kero and Diesel but Naphtha also will go through a single hydrotreater before separation.

First, a pre-tower separates out Diesel from Residue.
Then the Diesel- stream goes through the common hydrotreater.

Only after hydrotreating is the product fractionated.

This concept reduces the need for multiple hydrotreating units, and saves on equipments.

#6 rdcrags

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Posted 19 December 2016 - 12:24 AM

The amount of fuel will less with the combined products case, not more. It is not necessary to reduce the number of pumparounds for the combined product case. Therefore, the column diameter can be optimized as before.



#7 mohammad reza

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Posted 08 January 2017 - 05:51 AM

Answers could be different depending upon the quantities/qualities involved in the process.

For instance:

1) feed to CDU is a condensate or a "full" crude?

2) capacity of the CDU?

3) quantities of gasoil and kerosene?

Good luck!

1) the feed is condensate.

2) 60,000 BPSD

3) gas oil+kerosene= 23000 BPSD (maximum)



#8 mohammad reza

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Posted 08 January 2017 - 05:56 AM

There is a design by JGC called the JUST refinery. You can check out the details at their website.
In their concept it is not just Kero and Diesel but Naphtha also will go through a single hydrotreater before separation.

First, a pre-tower separates out Diesel from Residue.
Then the Diesel- stream goes through the common hydrotreater.

Only after hydrotreating is the product fractionated.

This concept reduces the need for multiple hydrotreating units, and saves on equipments.

thanks a lot.






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