FIS-483 Consolidated Engineering Study Report

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Marathon Petroleum Company, Catlettsburg Refinery, KY Capacity Improvement <strong>Study</strong> of LPCCR Platformer Heater (1-44-B-1/2/3/4) 2.4 Fuel Gas Characteristics The following fuel gas design composition from datasheet is used for the existing design, operating and proposed design simulations. Table 7: Fuel Gas Properties Parameters Units Refinery Gas Design Alternate Specific Gravity at 60°F - 0.68 0.60 Heat of Combustion (LHV) Btu/Scf 1,120 1,005 Fuel temperature at burner F 100 100 Components H2 % 39.33 46.70 CH4 % 18.41 22.60 C2H6 % 24.34 14.10 C3H6 % 1.21 2.30 C3H8 % 12.58 7.80 I-C4H10 % 1.31 2.00 n-C4H10 % 1.61 2.00 i-C5H12 % 1.21 1.25 n-C5H12 % 0 1.25 Total % 100 100 Furnace Improvements Low Cost Solutions for Fired Heaters 20
Marathon Petroleum Company, Catlettsburg Refinery, KY Capacity Improvement <strong>Study</strong> of LPCCR Platformer Heater (1-44-B-1/2/3/4) Section 3 System Analysis 3.1 LPCCR Platformer Heater Description The CCR Platformer heater (1-44-B-1/2/3/4) is a four-cell box type with Vertical Arbor (“U”) coils. The Platformer heater has a common convection section and a self-supported & top mounted stack. The heater was originally built and installed in 1992. The heater operates under natural draft. The Platformer heater radiant box consists of 4 cells; Charge heater, No. 1 Interheater, No. 2 Interheater and No. 3 Interheater. The radiant section of the heater is used to heat process service and the convection section is used for waste heat recovery. The total absorbed duty of the heater is 156.76 MMBtu/hr. The total process duty in the radiant section is 106.26 MMBtu/hr and the waste heat duty in the convection is 50.5 MMBtu/hr. The heater is designed for gas firing and is operated at 15% excess air. The firing rate of the heater is 177.51 MM Btu/hr (LHV). The net thermal efficiency of the heater is 88.3% (based on LHV) considering 2% radiation heat loss. 3.1.1 Radiant Section The process feed to the radiant section is a mixture of Naphtha and Recycle Gas. The flue gas temperature leaving the radiant section is 1,500ºF. Charge Heater (1-44-B-1) The Charge heater is designed for a 26.12 MMBtu/hr heat duty. It has a normal duty of 23.75 MMBtu/hr. This cell is designed to heat 211,731 lb/hr of feed from 866ºF to 1,010ºF. The feed enters at a pressure of 77 psig and leaves at 75.8 psig. The calculated coil pressure drop is 1.2 psi. The process fluid mass velocity is 23.8 lb/sec.ft 2 . The average radiant heat flux is 9,075 Btu/hr.ft 2 and the maximum Furnace Improvements Low Cost Solutions for Fired Heaters 21
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FURNACE IMPROVEMENTS PROPOSED CONVE
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FIS-483 Consolidated Engineering Study Report

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