7 replies to this topic

[B-2 Spirit]

Hi folks,

I am doing simulation of an existing Gas oil hydrotreater. I need information regarding simulating the reactor.
What I understand from exisitng information and similar simulation is that the product yield is defined in the reactor module. How do we estimate the product yield from the reactor?
I have the simulation model with Light gas oil and I have to estimate the performance of the unit with heavy gas Oil, while I have the feed defined, how can I get a good estimate of the reactor yields and the hydrogen requirements.


thanks for your help in advance.

Alok

[Chellani]

Alok,
Are you simulating or modeling?
If you are using any of the commercial reactor modules (RefSYS/Profimatics); they should be able to satisfy your requirements after you've 'tuned' your modules.
If you are not using these commerical tools, you need to model your reactor first i.e. write basic equations / use statistical method.

Hope this helps.

[B-2 Spirit]

Chellani,

I have a simulation of distillate hydrotreater unit processing LGO of a certain quality.
The reactor module is yield shift reactor with defined product yields which are obtained from pilot plant test run data.

I need to assess the performance of this reactor with a different LGO quality (heavier).
Will I be able to do it after making certain assumptions like same hydrogen requirement and lighters production. Please guid me further.
In the mean time I will try to use the refsys hydrotreater...

Waiting for your reply.

Thanks

Alok

[Chellani]

Dangerous. If I understand correctly, yield shift reactor is not designed for this. You are using data for light gas oil to predict performance for heavy gas oil i.e. you are extrapolating (for feed assay) for which yield shift reactor is not designed (correct me if I am wrong).
Hydrogen requirement for heavy gas oil would be definitely more than for light one; I am not setting any basis but for similar performance e.g. %HDS, %HDN heavies would have more chemical H2 consumption.
You must use kinetic models designed specifically for hydroprocessing.

[B-2 Spirit]

Chellani,

thanks for your reply. I agree with you that this exercise is very dangerous. I gather from the aspentech manuals that yield shift reactor can be used to simulate the hydrotreater but only if we know the product quality.
I am thinking of using models which are specifically designed for hydroprocessing. Can you name them for me. Also if you can give me any tutorial for hydrotreater simulation.

regards,
Alok

[Chellani]

I know about two companies providing solutions for them i.e. Aspen and KBC; Aspen's product is (was) called RefSYS and KBC's models are called DHTR-SIM, VGO HTR-SIM or HXX-SIM.
I've worked on KBC's HXX-SIM and was happy with the results.
There is no short-cut for your simulation so you got to buy any of these products and if you buy them, tutorial/training should be part of the purchase.

[B-2 Spirit]

Chellani,
thanks for your suggestions.
We have approached the vendors for this study and they have come out with the results and required recycle gas and make up gas rate... and product D86 distillation. Thanks for your replies, they were good info.