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Method for Reducing Fouling of Coker Furnaces

  • US 20090266742A1
  • Filed: 04/28/2008
  • Published: 10/29/2009
  • Est. Priority Date: 04/28/2008
  • Status: Active Grant
First Claim
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1. A method for reducing furnace fouling in a delayed coking process wherein at least one coker feed is supplied to a delayed coking unit comprised of a coker furnace, at least two coke drums and a coker fractionator comprising(a) increasing the aromaticity of the feed to produce a modified stream by combining with the feed upstream of the coker furnace at least one added stream selected from the group consisting of an aromatic gas oil, a hydrotreated aromatic gas oil and combinations thereof, said aromatic gas oil having an aromatic carbon content of at least about 40% as measured by 13C NMR based on the total carbon content of the added stream and said hydrotreated aromatic gas oil having an aromatic carbon content of at least about X % according to the formula
X=(A %)−

  • [(0.02)·

    (hydrogen uptake in the hydrotreater)] 

    where X is as least about 20% as measured by 13C NMR based on the total carbon content of the hydrotreated aromatic gas oil and A is the aromaticity of the unhydrotreated aromatic gas oil as measured by 13C NMR and is at least about 40%, hydrogen uptake is [ρ

    ·

    659.5·



    hydrogen content (wt %) of the hydrotreater product and feed)] and ρ

    is the density (grams/cc) of the hydrotreater feed;

    (b) introducing the modified stream into the coker furnace;

    (c) heating the modified stream to a coking temperature in the coker furnace to produce a heated modified stream; and

    (d) transferring the heated modified stream from the coker furnace to a coke drum.

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