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Coen sometimes uses Computational Fluid Dynamics (CFD) to evaluate the
formation of pollutants in various burner applications. While computer
modeling is still in its infancy with regard to making accurate predictions,
it does help to clearly illustrate the locations of major pollutant formation
regions in the furnace. This aids our engineers in making design modifications
with a minimum of trial-and-error testing.
This particular model is of a small-scale research furnace. The furnace
is octagonal in shape and has quartz side walls for optical instrumentation.
The burner is mounted at the bottom and fires natural gas vertically upward
from the burner. With this particular furnace, the Fluent CFD code was able to predict the stack
NOx levels to within a factor of three, which is fairly close for an ultra-low
NOx application such as this one. Figures like those shown below are very
useful in identifying NOx-formation regions, which in turn helps our engineers
to make the necessary design modifications to the burner.
Furnace geometry. |
Temperature distribution. |
NOx concentration distribution. |
CFD Features Used in This Model:
- A 3D unstructured grid (tet mesh).
- The standard k-e turbulence model.
- Variable properties (viscosity, thermal conductivity, and specific
heat are functions of temperature.
- The buoyancy model.
- The P-1 radiation model.
- The finite reaction rate combustion model.
- The NOx post-processor.
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