IFRF 2012 Inclined Firing System
-
Upload
yogitadoda -
Category
Documents
-
view
565 -
download
2
description
Transcript of IFRF 2012 Inclined Firing System
![Page 1: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/1.jpg)
IFRF- May 2012Inclined Burner Firing System Eliminates Flame ImpingementBy: Ashutosh Garg
![Page 2: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/2.jpg)
www.heatflux.com 2
Inclined Burner Firing System
• Client facing flame impingement and high tube metal temperatures in radiant section
• FIS recommended inclined burner firing system to eliminate flame impingement
• Carry out CFD Modeling of the Burners and Radiant Section to demonstrate the benefit of inclined burner firing system
![Page 3: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/3.jpg)
www.heatflux.com 3
Burners-Existing
• Forced draft gas fired ultra low burners
• 24 burners, 12 Numbers in each cell
• Normal firing rates- 4.9 MMkcal/hr
• Burner air pressure drop- 22.5 mmwc
• Burner to tube center clearance – 1500 mm
![Page 4: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/4.jpg)
www.heatflux.com 4
Existing Burner Arrangement
EXISTING FLOOR & PLENUM ARRANGEMENT
![Page 5: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/5.jpg)
www.heatflux.com 5
Inclined Firing System Burner Arrangement
![Page 6: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/6.jpg)
www.heatflux.com 6
Heater Geometry for Base Case
Outlet
Radiant tubes
Reed wall
Fuel inlets Air inlets
• Fuel inlets are mentioned independently for primary and secondary tips (shown in the figure) i.e. fuel distributor is not modeled in the current case
![Page 7: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/7.jpg)
www.heatflux.com 7
Inclined Firing System Modification
• In this modification burner was made 12’’ closer towards center i.e. the BCD was made 15 ft 3.75’’
• Burner is inclined 5 deg towards center
• Reed wall is removed in this model
![Page 8: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/8.jpg)
8
Burner Geometry
Recirculation hole Burner tiles
Staged tip with 3 holes
www.heatflux.com
![Page 9: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/9.jpg)
www.heatflux.com 9
Results of CFD Modeling
• Velocity Vectors• Temperature Contours-Elevation• Temperature Contours- Plan View• CO Contours – Plan View• Path lines by temperature• Iso surfaces at 2000 ppm ( flame boundaries)- top view and
elevation view-colored by temperature• Conclusion
![Page 10: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/10.jpg)
www.heatflux.com 10
Velocity vectors (ft/s)Base Case
• Velocity vectors shows that it is moving away from center due to circulation at center
Circulation zone
50 ft
36 ft
19 ft
0 ftheight
in ft
![Page 11: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/11.jpg)
www.heatflux.com 11
Velocity vectors (ft/s) at 45 ° Inclined Firing System
• Velocity vectors shows that flame is inclined towards center, this is due to no circulation formed at the center of heater
No Circulation zone
50 ft
36 ft
19 ft
0 ftheight
in ft
![Page 12: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/12.jpg)
www.heatflux.com 12
Velocity vectors (ft/s) at 45 deg –Base case vs. Inclined Firing System
50 ft
36 ft
19 ft
0 ft
height in ft
![Page 13: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/13.jpg)
www.heatflux.com 13
Temperature contours (°C) – Base Case
30° Angle 40° Angle 50° Angle 60° Angle
![Page 14: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/14.jpg)
www.heatflux.com 14
Temperature Contours (°C) – Inclined Firing System
40° Angle 50° Angle30° Angle 60° Angle
• High temperature regions are concentration in the center of burner. No high temperature species is moving towards radiant tubes
![Page 15: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/15.jpg)
www.heatflux.com 15
Temperature Contours (°F) at 45° Section- Base Case VS. Inclined Firing System
Base case Inclined Firing System
![Page 16: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/16.jpg)
16
Temperature contours at different section (°F)- Base Case
At 5 ft At 10 ft
At 15 ft At 20 ftwww.heatflux.com
![Page 17: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/17.jpg)
17
Temperature contours at different section (°F)- Inclined Firing System
At 5 ft from heater base At 10 ft
At 15 ft At 20 ft
Low temperature
regions
www.heatflux.com
![Page 18: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/18.jpg)
www.heatflux.com 18
Temperature contours(°F) at 5ftsection- Base Case VS. Inclined Firing System
1
At 5 ft
Base case
At 5 ft
Inclined Firing System
![Page 19: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/19.jpg)
www.heatflux.com 19
Temperature contours(°F) at 10 ft section- Base Case VS. Inclined Firing System
Base case Inclined Firing System
At 10 ft At 10 ft
![Page 20: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/20.jpg)
20
CO mass fraction contours (PPM) at different sections – Base Case
1At 5 ft from heater base At 10 ft
At 15 ft At 20 ftwww.heatflux.com
![Page 21: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/21.jpg)
www.heatflux.com 21
CO mass fraction contours (PPM) at different sections - Inclined Firing System
At 5 ft from heater basement At 10 ft
At 15 ft At 20 ft
![Page 22: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/22.jpg)
www.heatflux.com 22
CO mass fraction contours (PPM) at 15 ft section- Base Case VS. Inclined Firing System
1
Base case
At 15 ft At 15 ft
Inclined Firing System
![Page 23: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/23.jpg)
www.heatflux.com 23
Iso surfaces of 2000 PPM of CO colored by temperature (°F)- Base Case
• Top and front views shows that flame is interacting with radiant tubes
Top viewQuarter section
Flame on radiant tubes
Front view
![Page 24: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/24.jpg)
www.heatflux.com 24
Iso surfaces of 2000 PPM of CO colored by temperature (°F)- Inclined Firing System
• Top view shows that flame is not interacting with radiant tubes• Front view shows how the flame is inclined towards center of heater
section
Top view
Quarter section
Front view
![Page 25: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/25.jpg)
25
Iso surface of CO mf 2000 PPM colored by temperatures (°F) Base Case VS. Inclined Firing System
Base Case Inclined Firing System
Top Viewwww.heatflux.com
![Page 26: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/26.jpg)
www.heatflux.com 26
Summary
• Base case has the recirculation region at center of heater, there by diverting the flow towards the radiant tubes.
• Inclined Firing System- has no recirculation zone between opposite burners there by no bending of flame is observed
• High temperatures are confined to center of heater • FIS recommends inclined firing system revamp of
burners and floor revamp.
![Page 27: IFRF 2012 Inclined Firing System](https://reader033.fdocuments.net/reader033/viewer/2022052412/558c2d55d8b42aa5738b472d/html5/thumbnails/27.jpg)
www.heatflux.com 27
We hope you will find our presentation helpful and informative.