18 replies to this topic

[sheida]

hello

could you tell me some information about designing a HDS unit for desulfurization of fuel oil

thank you

[pavanayi]

What are you trying to achieve? You usually aska licensor to design one for your particular needs.

[colt16]

Looks like the IMO regulation of achieving 0.5wt% of sulphur for bunker fuels has sent people scrambling to search for solutions.

[sheida]

What are you trying to achieve? You usually aska licensor to design one for your particular needs.

our fuel is mazut with 3.5%wt sulfur content. this fuel is used for a power plant. our selective method for desulfurization is HDS. and would you give me some information about various cites around the world that they have done similar project

[PingPong]

Desulfurizing 3.5 % S fuel oil is a very costly process.

Only specific licensors like Axens, CB&I Lummus and UOP are able to design such a unit.

Some refineries have such process unit (plus all required supporting units) to produce low sulfur fuel oil (LSFO) that they sell.

 

I am quite sure that no power plant in the world is buying 3.5 % S fuel oil to desulfurise it themselves. That would require building a lot of process units (HDS plus supporting units) at enormous investment and operating costs.

 

If your power plant needs to operate on LSFO then you simply buy LSFO.

Buying HSFO and desulfurizing it yourself is madness.

[gegio1960]

Sheida,

what is the needed quantity of FO?

what is your final target? (eg SOX max concentration in flue gases? S max concentration in Fuel Oil?)

what is the configuration of your power plant?

how would you provide the hydrogen needed for the Fuel Oil desulfurization?

[Amardeep]

Looks like the IMO regulation of achieving 0.5wt% of sulphur for bunker fuels has sent people scrambling to search for solutions.

Yes. We have this concern. Can you provide some solution? Our plant capacity is 10000Bpd.

Thanks

[Nikolay_]

Hello,

 

You can use HDS of part vacuum gasoil from VDU and then blend with residue to produce fuel.

[colt16]

 

Looks like the IMO regulation of achieving 0.5wt% of sulphur for bunker fuels has sent people scrambling to search for solutions.

Yes. We have this concern. Can you provide some solution? Our plant capacity is 10000Bpd.

Thanks

 

 

Is that 10,000bpd total Fuel Oil production or total Crude feed? 

 

 

If it is total crude feed, it doesn't seem big enough to justify expensive hydrotreating solutions. 

Anyway one possible way is to put a distillation column after your diesel hydrotreater and send a heavier feed to the diesel hydrotreater and using the column at the end to separate the Diesel from Fuel Oil. However, you need to check with your licensor. 

[gegio1960]

Just a couple of considerations:

- the advice from Nikolay could be effective only in cases of slight difference b/w the actual S content in the Residue and the final S spec. Anyway, it would be very expensive in terms of missed income.

- the advice from colt16 is not applicable. In order to reduce S in Residue you need very higher pressures and H2 quantities than those utilized by HDS of Gasoils. 

If Amardeep would really like to obtain some advices, he should give more details about the current refinery configuration, S in residue, type of residue (short, long), type of crude.....

Anyway, as highlighted by colt16, the quantities involved couldn't justify an investment. The solution could be a Coking....

Good luck!

[colt16]

I should make it clear that I meant to say lift up a bit of a heavier diesel feed and not process the whole lot. The amount to lift up will obviously be limited by the current operating conditions and see whether this gives a sufficient amount of extra low S stream to play with in the blending.

 

Anyway without a detailed look at the whole plant it is hard to say. 

[Amardeep]

Thanks Nikolai, Colt and Gegio for your valuable suggestions.

 

10,000 Bpd is our Crude Unit feed. We have only crude unit with two side strippers. One for Kerosene and other for Gasoil. Column bottom residue is Fuel oil without further treatment. Our main products are Gasoil and Fuel oil.  

We operate 3 types of crudes (basically these are slops). Please check the below details.

 

   

  Test name  Test method Whole Crude LPG upto C5 Naphtha 35-200°C Kerosene 200-250°C Gasoil 250-375°C Fuel oil  375+ °C   Crude 1 Yield by mass D2892   - 16.18 13.25 35.98 34.59   Density @ 15°C, Kg/L D1298/D4052 0.8806   0.7752 0.8487 0.8859 0.9598   H2S, mg/kg UOP 163 <1             Mercapten sulfur, mg/kg UOP 163 23   38 <3       Sulfur, Mass % D4294 0.175   0.008 0.041 0.149 0.313                   Crude 2 Yield by mass D2892   0.87 20.86 8.53 21.25 48.8   Density @ 15°C, Kg/L D1298/D4052 0.851   0.7437 0.8213 0.8676 0.977   H2S, mg/kg UOP 163 <1             Mercapten sulfur, mg/kg UOP 163 74   90 5       Sulfur, Mass % D4294 2.12   0.056 0.282 1.21 3.73                   Crude 3 Yield by mass D2892   - 22.64 8.94 23.96 44.46   Density @ 15°C, Kg/L D1298/D4052 0.8793   0.7612 0.8245 0.8639 0.9732   H2S, mg/kg UOP 163 <1             Mercapten sulfur, mg/kg UOP 163 145   182 20       Sulfur, Mass % D4294 1.43   0.047 0.205 0.788 2.64

 

 

 

 

 

Thanks

Amardeep

Edited by Amardeep, 30 May 2017 - 02:04 AM.

[Amardeep]

 Refinery Margins 1.pdf   194.08KB   24 downloads

 

Thanks Nikolai, Colt and Gegio for your valuable suggestions..

 

10,000BPD is our crude unit feed. We are operating 3 different crudes (basically these are slops). We have only one crude unit with 2 side strippers, one for Kerosene and other for Gasoil. Main products are Fuel oil and Gasoil.

Please find attached file for more details.

 

Thanks,

Amardeep

[gegio1960]

There is no way to economically produce Fuel Oil @ 0.5 %S in this situation.

Except for the part obtainable by blending the FO from Crude 1 with that from Crude 2/3

eg 100 t of FO .5S can be obained from 92/8 blend of FO1/FO2 or 95/5 of FO1/FO3

Maybe the economic situation could be slightly improved by installing a VDU on the remainder of AtmRes, producing Asphalt (ie a sink for S) and recovering the VGOs as Gasoils. But you need a market for Asphalt and the possibility to worsen the quality of Gasoil (?)...

Good luck!

Edited by gegio1960, 30 May 2017 - 08:44 AM.

[Amardeep]

Thank you Gegio. 

 

Is there any possibility with Bio-desulfurising of crude? 

Can i get any info regarding Bio-desulfurising or links that i can go through?

 

Thanks and Regards,

Amardeep

[colt16]

Thank you Gegio. 

 

Is there any possibility with Bio-desulfurising of crude? 

Can i get any info regarding Bio-desulfurising or links that i can go through?

 

Thanks and Regards,

Amardeep

 

 

When the time comes, is it possible to run Crude 1 only? It seems like you can meet the spec with just this Crude alone. Does the Gas oil fraction becomes limiting? As i see that Gasoil fraction for Crude 1 is quite high. 

[Amardeep]

Hi Colt,

 

Yes, you are correct. If we run crude-1, we can meet the spec. unfortunately, It is not possible to run only Crude-1. 

Gas oil fraction and Fuel oil are limiting.

 

Our management is more interested in Bio-desulfurization. Can I get some info where Bio-desulfurization is implemented?

 

Regards,

Amardeep

[colt16]

I honestly think your money is better spent debottlenecking your GasOil and Kero downstream units.

 

EDIT: And run Crude 1.  

Edited by colt16, 05 June 2017 - 03:20 AM.

[Amardeep]

Okay Colt. Thank you