Crude Preheat Curramix Coating 1-Year Projection

This study evaluates a Crude preheat exchanger service heat transfer performance with the following tube material and coatings and estimates the energy savings and CO2 Emissions Reduction:

• Carbon Steel
• Stainless Steel
• Carbon Steel Tube ID Coated
• Stainless Steel Tube ID Coated

• Service – Desalted Crude vs Heavy Vacuum Gas Oil (HVGO)
• Tube ID Coating Thickness – 25 Microns (0.001 inch)
• Coating Thermal Conductivity – 0.722 Btu/hr-ft-F
• Fuel Value -$3.50 per MBtu/hr
• Furnace Efficiency = 0.9
• Network Factor = 0.75
  [Part of the Duty Gain in the Exchanger Diminishes Heat Transfer on other Exchangers in the Preheat Train due to changes in temperature differentials]
• CO2 Reduction based on EPA Conversion Equations
• Heat Transfer Calculation performed with HTRI XIST
• Assumed Fouling Factor shown in the Comparison Tables below
• Assumed Inlet Operating
  • Crude Inlet Temp – 370 F
  • Crude Rate – 650 klb/hr
  • HVGO Inlet Temp - 505 F
  • HVGO Rate – 675 klb/hr
    • Stream Properties

Heat Exchanger Geometry

• TEMA – AES
• Shell Id = 50”
• 1054 Tubes
• 1” Tube OD
• 083” tube wall thickness
• 4 Tube Passes
• 20 ft length
• 11 Baffle Cross Passes, Single Vert Seg , 20.9% Cut

Comparison Tables

Coated Versus Carbon Steel

• Annualized Duty Reduction = 3.6 MBtu/hr
• Energy benefit = $93k a year
• CO2 Equivalent Benefit = 1,407 Tons a year

Coated Versus Stainless Steel

• Annualized Duty Reduction = 2.0 MBtu/hr
• Energy benefit = $50k a year
• CO2 Equivalent Benefit = 760 Tons a year