Analysis of NOx and Ammonia Conversion Kinetics in a Dual-Bed Plug-Flow Reactor
Application ID: 10194
This suite of examples illustrate the modeling of selective NO reduction, that occurs as flue gases pass through the channels of a monolithic reactor in the exhaust system of a motored vehicle. The simulations are aimed at finding the optimal dosing of NH3, the reactant that serves as reducing agent in the process.
Three different analyses are performed:
Kinetic analysis: The example takes a closer look at the selective reduction in a single channel of the monolithic reactor. The reaction kinetics is analyzed with the Reaction Engineering interface using the Plug flow reactor type.
Detailed process modeling: The example utilizes the optimal dosing of NH3 as found in the above example as a starting point. This model is set up in 3D and can thereby reveal the full space-dependency of the problem with even better tuning of the dosing level.
Thermal stress modeling: The model studies thermal gradients in the monolith unit caused by heat released from the chemical reactions. The Structural Mechanics Module together with the 3d model above is used for this investigation.
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
- COMSOL Multiphysics® and
- Chemical Reaction Engineering Module and
- either the MEMS Module, Metal Processing Module, or Structural Mechanics Module and
- either the Acoustics Module, MEMS Module, Multibody Dynamics Module, or Structural Mechanics Module
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.