FIS-483 Engineering Study Report R1.03.11.19
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Marathon Petroleum Company, Catlettsburg Refinery, KY<br />
Capacity Improvement <strong>Study</strong> of LPCCR Platformer Heater (1-44-B-1/2/3/4)<br />
3.2 Debutanizer Reboiler Description<br />
The Debutanizer Reboiler (1-44-B-5) is a vertical cylindrical, natural draft heater.<br />
The heater was originally built in 1992. It is located adjacent to the CCR Platformer<br />
heater (1-44-B-1/2/3/4). It has a horizontal convection section. The flue gases leave<br />
the convection section through a duct that combines to the Platformer Heater stack.<br />
The total absorbed heat duty of the heater is 10.16 MMBtu/hr. It is designed to heat<br />
124,436 lb/hr of debutanizer bottoms from 447°F to 504°F. The feed inlet pressure<br />
is 215 psig and the coil pressure drop is 50 psi. the inlet-outlet vaporization is 0%<br />
and 50% respectively.<br />
The calculated average radiant heat flux is 9,000 Btu/hr/ft 2 and the maximum<br />
radiant heat flux is 16,200 Btu/hr/ft 2 . The process fluid mass velocity is 172.3<br />
lb/sec/ft 2 . The maximum tube metal temperature is 555°F. The hot flue gases enter<br />
the convection section at 1,310°F and leave at 538°F. The maximum flue gas mass<br />
velocity through the convection section is 0.370 lb/sec.ft 2 .<br />
The heater is designed for fuel gas firing at 15% excess air. The firing rate of the<br />
heater is 11.81 MMBtu/hr. The calculated net thermal efficiency is 86% (based on<br />
LHV) considering a heat loss of 2%.<br />
The Debutanizer reboiler (1-44-B-5) consists of:<br />
Radiant Section<br />
Convection Section<br />
Flue gas duct<br />
Burners<br />
3.2.1 Radiant Section<br />
The radiant section inside insulation height and diameter is 18.34 ft and 10.54 ft<br />
respectively. It consists of total 28 tubes of 6” NPS, Sch.40 arranged in single pass<br />
arrangement. The tubes are made of A106 Gr.B metallurgy. The tube circle<br />
diameter is 8.94 ft. The radiant effective tube length is 16.75 ft. the straight tube<br />
length is 15.17 ft. The total radiant section heat transfer area is 813 ft 2 .<br />
The radiant wall casing is made of 1/4” thk. CS material. The radiant shielded wall<br />
is lined with 6” thk. L.W. Castable Kaolite 2200. The radiant floor is lined with 8” thk.<br />
L.W. Castable Kaolite 2200. The radiant arch is lined with 6.5” thk. L.W. Castable<br />
Kaolite 2200.<br />
3.2.2 Convection Section<br />
Furnace Improvements<br />
Low Cost Solutions for Fired Heaters 38
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