Advanced Combustion Control of Fired Heaters

Features

Efficiency 

• Reduce fuel consumption 
• Increase throughput 

Emissions

• Reduce SCR load
• Reduce pollutants 
• NO_x
• CO
• CO₂

Lifecycle

• Tuber hanger life
• Tube life
• SCR catalyst 

Safety

• Compliance with API 556
• Hazard preventive functions to control situation before trip fuel 
• New layers of protection
  • Real-time fuel density 
  • Near real-time combustibles 
  • Accurate draft pressure 

TDLS8000 Difference

• Measurement in radiant section 
• Fast detection of CO breakthrough
  • Single digit low limit of quantification
• Methane detection
  • LOP for startup safety
• Averaging oxygen across radiant sections
• Solid state device
• Not a potential ignition source 

Laser Based Analysis 

• Laser based technology is not an ignition source to flue gas and does not require reference air 
• Response time is less than 2 seconds 
• When controlling a fired heater's air/fuel ratio near the CO breakthrough point, an IR or laser based CO specific measurement is recommended 
• Enables advanced combustion control. Oxygen control at less than 1% may be possible. 

Stoichiometry 101

Impact of Air Rich Flue Gas

Impact of Air on Efficiency 

• Lowering air equals higher coil outlet temp 
  • Reduces firing rate = saves fuel 
  • Less emissions 
  • Increased throughput 
• High convection temperatures = increased coking 

Asset Sustainability  

• Tubes and hangers designed with minimal thickness 
  • lower temperatures increase life
  • Operating design temperatures cause failures 

Cross Benefits 

Conclusion

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