Inclined Burner Firing Eliminates Flame Impingment Short
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Transcript of Inclined Burner Firing Eliminates Flame Impingment Short
![Page 1: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/1.jpg)
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04/13/23 Furnace 1
Study Objectives
• Identify ways to eliminate flame impingement on the tubes and reduce tube metal temperature in radiant section
• FIS has recommended the following modifications:– Bring Burners Closer to the Center by about 1-2 ft..– Incline burners by 5 towards the center
• Carry out CFD Modeling of the Burners and Combustion Chamber to demonstrate the benefits of the proposed modifications
![Page 2: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/2.jpg)
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Existing Burner Arrangement Elevation
04/13/23EXISTING FLOOR & PLENUM ARRANGEMENT
Furnace Improvements
![Page 3: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/3.jpg)
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Velocity Vectors at 45 degBase Case vs. Proposed Case
![Page 4: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/4.jpg)
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Temperature Contours at 45 degBase Case vs. Proposed Case
Base Case Proposed Case
![Page 5: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/5.jpg)
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Temperature Contours at 5ft Base Case vs. Proposed Case
Base Case Proposed Case
At 5 ft.At 5 ft.
![Page 6: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/6.jpg)
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Temperature Contours at 10ft Base Case vs. Proposed Case
Base Case Proposed Case
At 10 ft.At 10 ft.
![Page 7: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/7.jpg)
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CO mass fraction contours (PPM) at 10ft Base Case vs. Proposed Case
At 10 ft.At 10 ft.
![Page 8: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/8.jpg)
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CO mass fraction contours (PPM) at 15ft Base Case vs. Proposed Case
At 15 ft.At 15 ft.
![Page 9: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/9.jpg)
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Path lines colored by temperature (o F)- Base Case vs. Proposed Case
Base Case Proposed Case
![Page 10: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/10.jpg)
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Iso surface of CO mass fraction 2000 PPM coloredby flame height (ft.)- Base Case vs. Proposed Case
Base Case Proposed Case
![Page 11: Inclined Burner Firing Eliminates Flame Impingment Short](https://reader035.fdocuments.in/reader035/viewer/2022062319/558c2cb5d8b42ac3738b4691/html5/thumbnails/11.jpg)
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Summary
• Base case has the recirculation region at center of heater, there by diverting the flow towards the radiant tubes.
• Proposed Case has no recirculation zone between opposite burners there by no bending of flame is observed
• Due to above reason flame length is increased for 20 ft(for base case) to 24 ft. for Proposed Case
• High temperatures are confined to center of heater • Flame impingement is eliminated