Coke trap reduces FCC slurry exchanger fouling for Texas refiner

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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