Modeling Catalytic Combustion of Methane Using Wall Surface Reaction
Catalyzed combustion is a ﬂameless process occurring at low temperature and thereby emitting less nitrogen oxide. It also oﬀers constraints for ﬂammability limits and reactor design. These advantages of catalyzed combustion determine its potential applications. This tutorial provides guideline and recommendation for the setup of catalyzed combustion of methane on platinum surface. This tutorial demonstrates how to do the following:
- Set up and solve catalyzed combustion problem.
- Use CHEMKIN import for setting up reactions and materials.
- Solve the case using appropriate solver settings.
- Postprocess the resulting data.
In this tutorial a catalyzed combustion of methane, hydrogen, and air mixture is modeled on a heated platinum wall of cylindrical channel. The cylindrical channel is modeled with 2D axisymmetric solver. Two CHEMKIN mechanism ﬁles are used to solve this problem: one has only the deﬁnition of gaseous species and the other has deﬁnitions of surface species as well as surface reactions. Volumetric reactions are not considered in this problem. The circular channel has three sections: inlet, catalytic, and outlet. The catalyzed reactions take place on the wall surface of the catalytic section.
This tutorial demonstrated how to simulate surface reaction using CHEMKIN ﬁle in ANSYS Fluent. For wall surface reactions you always need two sets of CHEMKIN ﬁle, one to deﬁne gaseous species and reactions, and another to deﬁne site and bulk species along with wall surface reaction.
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