Flame Interaction and Rollover Solutions in Ethylene Cracking - PowerPoint PPT Presentation

Nov 01, 2022 •36 likes •136 views

EEPC Ethylene Seminar 24-26 October 2012, Barcelona (Spain) Flame Interaction and Rollover Solutions in Ethylene Cracking Furnaces 1 EEPC Ethylene Seminar 24-26 October 2012, Barcelona Statement of Problem Cracking furnace must be

EEPC Ethylene Seminar 24-26 October 2012, Barcelona (Spain) Flame Interaction and Rollover Solutions in Ethylene Cracking Furnaces 1
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Statement of Problem • Cracking furnace must be retrofitted with new hearth burners to meet lower NO X requirements (150 mg/Nm3) • Tight burner spacing • Flame rollover is not acceptable 2
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Application Description • 2 Furnaces, 24 floor burners each, double fired • RFG ~10% H 2 by volume • Average firebox temperature: 1250 ° C • Firebox dimensions: 10.21 x 2.8 x 9.93 m • Induced draft 3
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Technology Employed • Zeeco “Enhanced - Jet” Ultra Low NO X Burner • Secondary tips inspirate inert flue gas into flame • Capable of sub 100 mg/NM 3 NO X emissions 4
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Reducing NOx Thermal NO X is the primary contributor to total NO X . Thermal NOx vs Adiabatic Flame Temperature Normalized Thermal NOx Production 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 Adiabatic Flame Temperature (°F) 5
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Burner Design • Secondary tips fire into flue gas, inspirating flue gas into the flame • Primary gas tips provide “fuel staging” and allow for tuning of heat flux profile 6
EEPC Ethylene Seminar 24-26 October 2012, Barcelona No Flame Rollover • Inherent furnace currents tend to pull gasses towards tubes around 4 m above floor • Fuel gas never crosses air stream so fuel gas is always between air and wall and cannot roll over 7
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Heat Flux Profile Heat flux profile can be “tuned” 8
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Enhanced Jet Data • 39 PPMV (79 mg/NM 3 ) NO X • Corrected to 3% O 2 • 1275 ° C Firebox • 1065 ° C Floor Temp. 9
EEPC Ethylene Seminar 24-26 October 2012, Barcelona Enhanced Jet Video 10

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