Confidentia l 06/16/22 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
Inclined Burner Firing Eliminates Flame Impingment Short
Jun 25, 2015
Presentation on Inclined Burner Firing Eliminates Flame Impingment Short
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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
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Existing Burner Arrangement Elevation
04/13/23EXISTING FLOOR & PLENUM ARRANGEMENT
Furnace Improvements
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Velocity Vectors at 45 degBase Case vs. Proposed Case
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Temperature Contours at 45 degBase Case vs. Proposed Case
Base Case Proposed Case
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Temperature Contours at 5ft Base Case vs. Proposed Case
Base Case Proposed Case
At 5 ft.At 5 ft.
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Temperature Contours at 10ft Base Case vs. Proposed Case
Base Case Proposed Case
At 10 ft.At 10 ft.
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CO mass fraction contours (PPM) at 10ft Base Case vs. Proposed Case
At 10 ft.At 10 ft.
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CO mass fraction contours (PPM) at 15ft Base Case vs. Proposed Case
At 15 ft.At 15 ft.
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Path lines colored by temperature (o F)- Base Case vs. Proposed Case
Base Case Proposed Case
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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
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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
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