Hello everybody, has anybody some experience in modelling methane steam reforming with FLUENT? Moreover, I would like to include 3 global reactions (article from Xu 1989) with its kinetical equations. Any suggestions? Thanx for replying! Claud

Dear Claud,

I'm intersted in steam reforming as well. so far all my work was with process simulators ,e.g Hysys, and i would like to expand to cfd as well. most of my cfd work is not reaction based and will aprecaite it if you could share your finidngs on steam reforming with me.

thanks for your time,

regards

sm

Just write a UDF that modifies the reaction rates (either volume or surface) and hook the UDF to the fluent solver.

It works...

Good luck

Hi Mathis, do you have an exact example for that UDF? Do you also work on steam reforming? I am highly interested since I want to model a part of an autothermal gasifyier. If you have a good example (since I have no experience in writing own UDFs) could you please contact me again so that we could exchange some information. Thanks a lot for your help! Claud

Hi Claud,

I can recommend you to look in the Fluent UDF Guide under the model dependant define macro "DEFINE_VR_RATE", there you can find some examples you can build your work on.

Mathis

Fluent does support power law kinectics. Is there any need to write an udf?

Hi RoM,

from my point of view it is necessary to write an own UDF since the kinetical equations are not that simple and I can only include simple kinetics in FLUENT (I have reaction rate equations including different partial pressures and the k-values, see "Methane Steam Reforming, Methanation and Water-Gas Shift: I. Intrinsic Kinetics" by Xu1989). So at the moment I am trying to figure out how UDF works in general. If you have any suggestions regarding that topic I would appreciate your answer.

Thanx.

Claud

Hi Claud,

Claud what is your deadline - if I get time I can try to make a small PDF guide... of some of my work?

Mathis

Hi Mathis,

thanks for your offer. It sounds like you are also working on this kind of topic or what is your research field? And regarding the deadline: as always "the sooner the better". For steam reforming processes I have done some modelling with Cantera/MATLAB in a plug flow reactor. Therefore, I think it would be interesting to implement the kinetics into FLUENT as a next step. At the institute we try to model an ATR gasifyier with FLUENT and up to now only the gas phase is working quite well but the heterogeneous reactions are not included up to now.

Thanx again. Claud

Unfortunalty i dont have the paper you mentioned. If you can send me a link or pdf copy i will take a look at it.

Depending on your model you need different macros for an udf. If you reaction mechanism is straight forward like natural gas combustion you can use "finite rate/eddy dissipation" as a reation model and a DEFINE_VR_RATE macro to define the reaction rates.

Since steam reforming reactions include CO-H2O shift you will probably want to account for the CO-H2O equlibirium. In this this case "finite rate/eddy dissipation" will produce poor results and its better to use EDC instead. EDC wont work with DEFINE_VR_VRATE, you will need DEFINE_NET_REACTION_RATE in this case.

RoM

Hi Claud,

I have been modelling ethanol/methane steam reforming by use of Fluent - trying to improve a reactor for hydrogen production, so i'm pretty sure that you can get some inspiration from that.

I'll try to cook up a PDF for you, maybe in the weekend.

Is that ok?

Mathis

Hi Mathis,

thanks a lot for your help and hopefully your inspiration (maybe even with an example?)! The weekend is fine for me.

Claud

Where should I send it?

Does anyone have some idea for how to incorporate complex kinetic rates(instead of the simple Arrhenius rate expression as in FLUENT)?

In view of the complexity of the kinetic model from Xu_Froment, I would like some comments on its implemenation in Fluent.

Thanks in advance!

[zpq]

Originally Posted by Mathis
;136827

Where should I send it?

It is a very old post. And I can not find the author of the post anymore.

Does anyone still have the UDF example for this steam reforming? Please contact me, thanks a lot!

zpq

[anandats]

Originally Posted by Mathis
;136713

Hi Claud,

I have been modelling ethanol/methane steam reforming by use of Fluent - trying to improve a reactor for hydrogen production, so i'm pretty sure that you can get some inspiration from that.

I'll try to cook up a PDF for you, maybe in the weekend.

Is that ok?

Mathis

Can you pls. send me the PDF on the steam methane reformation using UDF

[Ibrahim4435]

Originally Posted by anandats

Can you pls. send me the PDF on the steam methane reformation using UDF

Could anyone send me the PDF file as well.

[moataz.che]

Could someone send it to me, I am in a bad need for it in my research.
my e-mail:- moataz.che@gmail.com

Thanks in advance for your help and cooperation, wishing I can help you as soon as I get a chance.

[rr123]

dear sirs,

if you have got the pdf, i would be thankful if you can send to me as well.

thanking you

sincerely.

[Ibrahim4435]

Could anyone kindly send an example of udf for steam reforming here.