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[eureka!]

Any of you familiar with the rate equations by Xu and Froment on methane steam reforming and how they have derived it? There's no indication in their paper that it is an empirical equation but it doesn't quite look like a Langmuir-Hinshelwood Model.

 

The reaction schemes are shown below while the rate equations are shown in the attached:

 

CH4 + H2O <-> CO + 3 H2

CO + H2O <-> CO2 + H2

CH4 + 2 H2O <-> CO2 + 4 H2

 

Also, I would like to use this model to establish a process simulation (using HYSYS or PetroSim) for a down-fired reformer. However, I don't have the rate constants for the reverse reactions, would it still be possible to accurately model the system?

 

Thanks in advance.

Attached Files

•  Rate Equations_SMR.JPG   27.92KB   8 downloads

[Erwin APRIANDI]

eureka!

 

As I know there is more than 3 possible reaction in Methane Steam Reforming

 

 Methane Steam Reforming.jpg   54.5KB   8 downloads

 

"Also, I would like to use this model to establish a process simulation (using HYSYS or PetroSim) for a down-fired reformer. However, I don't have the rate constants for the reverse reactions, would it still be possible to accurately model the system?"

 

As I know after doing simulation for several projects which also includes some reaction involves and others, there is no such thing of accurate models. All process simulation model are only for prediction and later to have some idea for further analysis. And also the rate of equations used on each process simulation is based on each simulation default unless you can generate some small extension or additional module programming to be inserted in the simulation model.

 

You can try first to input the value that you have to one of the process simulation software that you intended to, and later try to check with the results that Xu and Froment given in their Journal.

 

Doing process simulation is never a ONE GO task even if you planned it properly, there will always an iteration process in the process.

 

Hope this help

Edited by Erwin APRIANDI, 19 May 2016 - 02:40 AM.