Coke trap reduces FCC slurry exchanger fouling for Texas refiner

09/08/2003
Marathon Ashland Petroleum LLC's Texas City, Tex., refinery reduced fouling and cleaning frequency in its lead slurry pumparound heat exchanger by installing a coke trap.The slurry exchangers recently operated for 18 months without fouling; they could have operated longer if the coke trap had not developed a hole in the basket. Marathon also eliminated injections of a slurry antifoulant, which saved the refiner $100,000/year.The slurry pumparound heat exchanger is on the FCCU's main fractionator. The run length of the slurry pumparound exchanger increased to 18 months from 6 months due to operating and mechanical changes to the slurry pumparound circuit.The mechanical changes were...
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