CFD Modeling
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At Envirokinetics we do our
own CFD modeling in house. The sequence of runs shown below demonstrates
how turbine flow 1st iteration is existing configuration |
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| velocity vectors, red = 100 fps | ammonia concentration contours, red = highest concentration | ammonia concentration contours, red = highest concentration |
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Note lack of flow in top 10% of
NOx catalyst perf plate 1 dp = 1.0" CO cat dp = 2.0" perf plate 2 dp = .15" NOx cat dp = 2.9" |
Ammonia is in red. Note high ammonia concentration at NOx catalyst in area of low TEG flow. |
Right hand view. Ammonia concentration is high at top because of low TEG flow. |
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2nd
iteration, the density of second perf plate will be increased |
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| velocity vectors, red = 100 fps | ammonia concentration contours, red = highest concentration | ammonia concentration contours, red = highest concentration |
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perf plate 1 dp
= 1.0" |
Ammonia is in red. Ammonia concentration at NOx catalyst is still very high indicating low flow in top part of duct. |
Right hand view. Ammonia concentration is still high at top because of low TEG flow. |
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3rd iteration, second perf plate will be replaced with a set of guide vanes to guide the flow to top of duct |
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| velocity vectors, red = 100 fps | ammonia concentration contours, red = highest concentration | ammonia concentration contours, red = highest concentration |
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It's not apparent looking at the velocity vectors that the flow pattern is changed. |
In this view it is obvious that the flow has increased in the top of the duct and the ammonia is now mixing with TEG. |
Another view showing the ammonia is now more evenly distributed. |
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4th iteration, both perf plates will be replaced with guide vanes to guide the flow to top of duct and the CO catalyst will be moved just upstream of the AIG |
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| velocity vectors, red = 100 fps | ammonia concentration contours, red = highest concentration | ammonia concentration contours, red = highest concentration |
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The flow pattern is improved. Flow is guided to the top of the duct. |
The flow has increased in the top of the duct and the ammonia is now mixing with TEG. No ammonia rich areas. |
Another view showing the ammonia is now more evenly distributed. |
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| Velocity profiles of both CO and NOx catalyst. Profile appears homogeneous from top to bottom on both catalyst faces. | ||
| 5th iteration, both perf plates will be replaced with big guide vanes to guide the flow to top of duct. | ||
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| big guide vanes | Section view of guide vanes, CO catalyst, AIG, and NOx catalyst | |
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| Flow vectors | Flow vectors indicating local velocity | |
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| Velocity contours at CO cat face and NOx cat face. | Ammonia concentration (Red is high concentration) | |
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| Pressure profile. | ||
| 6th iteration, both perf plates will be replaced with big smooth guide vanes to guide the flow to top of duct. | ||
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| Iso view of vanes | ||
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| flow vectors | flow vectors showing local velocities | |
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| pressure profile caused by vanes | velocity profiles at CO and NOx catalyst | |
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| ammonia concentration profile. | ||
