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2016 AIChE Ethylene Producers Conference – April 11-14, 2016 – Houston, TX


  • Ultra-low NOx emissions of less than 90 mg/Nm3 can be difficult in ethylene cracking
  • Typical NOx reduction methods can lead to longer flame lengths
  • Longer flame lengths cause:
    • Flame rollover to process tubes
    • Flame impingement on process tubes, and hot spots
    • Shorter run time between decoking
    • Reduced ethylene production
  • Zeeco’s GLSF enhanced-jet flat flame floor mounted burner
  • Burner entrains unburned fuel next to furnace wall
  • Mixes inert flue gas products of combustion with unburned fuel gas
  • Results:
    • Lower peak flame temperature
    • Reduced NOx emissions
    • Reduction in tendency for flame rollover because mixture is kept close to furnace wall

GLSF Enhanced Jet Flat Frame Burner

Staged ports on side of burner tile allow:

  • Fuel gas to avoid passing directly over combustion air stream
  • Delayed fuel and air mixing to reduce peak flame temperature
  • Reduction in peak flame temperature to decrease NOx emissions
  • More fuel and air momentum on furnace wall to reduce potential for flame roll over
  • Better control of flame width and length
  • Uniform heat flux profile in the middle and upper regions of the burner flame
  • Even heat transfer and reduction in possibility of tube hot spots



  • (8) new ethylene cracking furnaces needed to operate at less than 90 mg/Nm3 NOx emissions
  • After retrofit, closely mounted burners showed no signs of flame interaction or rollover
  • Burners achieved desired emissions, and normally operate well below guaranteed levels
  • Field measured NOx emissions were 35 mg/Nm3 (17 ppmv) to 65 mg/Nm3 (32 ppmv) at designed heat release


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