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Energy Targeting Of A Crude Column


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#1 Ajay

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Posted 13 November 2017 - 05:40 AM

Can anyone please point me to some literature for Energy Targeting specific to a "Crude Column" (not simple columns). I found many articles for a simple column but nowhere can i find its application to a crude column. 

 

I have been looking for this since a while now and I believe that this is not present in any open literature.



#2 breizh

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Posted 13 November 2017 - 05:52 AM

Hi ,

Consider the resources attached , you may find what you are looking for .

Good Luck

Breizh

Attached Files



#3 sukanta87

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Posted 13 November 2017 - 10:23 PM

1. Energy saving in a crude distillation unit by a preflash implementation

(https://ac.els-cdn.c...e4a1356dd97fa77)

 

2. Rigorous Procedure for the Design of Conventional Atmospheric II (not in open access)

 

3. Rigorous Procedure for the Design of Conventional Atmospheric I (not in open access)

 

4. Rigorous Procedure for the Design of Conventional Atmospheric III (not in open access)

 

5. Design of Crude Distillation Plants with Vacuum Units. I. Targeting I

(https://www.google.c...mTck4insXI85064)

Attached Files



#4 pavanayi

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Posted 14 November 2017 - 03:51 AM

Ajay,

Did you want to know more about 'Energy Targeting' as applied to the crude unit? (This includes the crude column plus all the associated heat transfer equipment)? or where you wondering about 'Column Targeting' as applied to a distillation column? 

 

On a side note, the link 1 above is not a true energy saving idea as there is a hidden yield loss associated with it. There is no real energy saving to be had by having a preflash separation.



#5 Ajay

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Posted 17 November 2017 - 02:01 AM

Hi ,

Consider the resources attached , you may find what you are looking for .

Good Luck

Breizh

Thank you Breizh for your reply! But, these attachments does not have the material of energy targeting procedure applied to a crude column. I am trying to find specific procedure of application of Pinch concept to "crude" distillation column (Introduced by Dhole and Linnhoff)

 

 

 

1. Energy saving in a crude distillation unit by a preflash implementation

(https://ac.els-cdn.c...e4a1356dd97fa77)

 

2. Rigorous Procedure for the Design of Conventional Atmospheric II (not in open access)

 

3. Rigorous Procedure for the Design of Conventional Atmospheric I (not in open access)

 

4. Rigorous Procedure for the Design of Conventional Atmospheric III (not in open access)

 

5. Design of Crude Distillation Plants with Vacuum Units. I. Targeting I

(https://www.google.c...mTck4insXI85064)

Dear Sukanta!,

First attachment is a paper on preflash implementation on a crude column. This is one method of energy savings but i am looking towards column targeting study.

I will study the last attachment and get back to you, even though from a cursory glance this does not seem to what I am looking for!

 

 

 

Ajay,

Did you want to know more about 'Energy Targeting' as applied to the crude unit? (This includes the crude column plus all the associated heat transfer equipment)? or where you wondering about 'Column Targeting' as applied to a distillation column? 

 

On a side note, the link 1 above is not a true energy saving idea as there is a hidden yield loss associated with it. There is no real energy saving to be had by having a preflash separation.

Dear Payanavi,

 

Yes, I want to know more about Energy targeting specific to a crude column wherein a enthalpy-temprature profile of the column (Column Grand Composite Curve) is generated based on the minimum thermodynamic condition and then analysed to to identify probable modifications to the column. I have carried this analysis to a simple column but i am finding it difficult to generate the enthalpy curve for a complex column. 


Edited by Ajay, 17 November 2017 - 02:04 AM.


#6 pavanayi

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Posted 17 November 2017 - 04:31 AM

Ajay, 

 

Column Targeting procedure is more applicable in a binary or a near-binary separation. For a multi-component separation, there is no real practical sense in doing the analysis. That may be a reason why you have not found any related material.

 

The main aim of performing a column target study is to optimise parameters like pressure, feed stage location, reflux, feed pre-heating/pre-cooling, and adding side condensers/reboilers, and you can see that for a CDU unit, you are not left with many degrees of freedom.

 

For a CDU unit, the only real parameter to focus on is the furnace fuel gas requirement, and the usual pinch analysis methodology is better suited for this application.



#7 Ajay

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Posted 17 November 2017 - 05:35 AM

Ajay, 

 

Column Targeting procedure is more applicable in a binary or a near-binary separation. For a multi-component separation, there is no real practical sense in doing the analysis. That may be a reason why you have not found any related material.

 

The main aim of performing a column target study is to optimise parameters like pressure, feed stage location, reflux, feed pre-heating/pre-cooling, and adding side condensers/reboilers, and you can see that for a CDU unit, you are not left with many degrees of freedom.

 

For a CDU unit, the only real parameter to focus on is the furnace fuel gas requirement, and the usual pinch analysis methodology is better suited for this application.

Dear payanavi,

 

I agree with you, but would that not be the case for only new design situation. I am working on retrofitting an very old designed crude column (1980's). In this column, there are 4 side draws but only 2 PA's. Hence the thought that there might be a possibility of maybe introducing another PA, (or optimizing current PA duties), i.e. adding side condensor which I want to identify thru the MTC Enthalpy-T profile.

 

Also, For your comment  "you can see that for a CDU unit, you are not left with many degrees of freedom", I was thinking that adding a PA would add degree of freedom which can be integrated with the rest of the process to reduce the furnace duty using pinch analysis. What do you think?

 

I am currently stuck on getting the MTC enthalpy profile.



#8 PingPong

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Posted 18 November 2017 - 04:07 AM

I am working on retrofitting an very old designed crude column (1980's). In this column, there are 4 side draws but only 2 PA's.

Ajay,

if you add a new PA to an existing crude column you will lose fractionation sharpness above that new PA.

First of all the new PA will require several trays for heat transfer that go at the expense of present fractionation trays.

Secondly due to the new PA there will be less vapor liquid traffic in the column section above the new PA.

So fractionation sharpness is reduced in the whole column above the new PA due to less equilibrium stages as well as less reflux from the top.

 

Increasing duties of existing PA's will also result in less separation sharpness above their location due to less vapor liquid traffic as a result of less reflux from the top.

 

You would need to cut the column and insert a new column part with additional new trays to make it feasible to add a new PA. If that is not what the owner wants then there is not much you can do but minor finetuning of the column operation.


Edited by PingPong, 18 November 2017 - 04:11 AM.





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