Catalytic Combustion of Methane Using Wall Surface Reactions

Modeling Catalytic Combustion of Methane Using Wall Surface Reaction

Introduction

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.

 

Problem Description

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.

Result

Summary

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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