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Method for reducing fouling of coker furnaces

  • US 7,922,896 B2
  • Filed: 04/28/2008
  • Issued: 04/12/2011
  • 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 for producing anode or fuel grade coke 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 a hydrotreated aromatic gas oil wherein the hydrotreated aromatic gas oil is formed from an unhydrotreated aromatic gas oil in a hydrotreater wherein the hydrotreater has a hydrotreater product and a hydrotreater feed, and wherein the hydrotreated aromatic gas oil has an aromatic carbon content of at least about X % according to the formula
X=(A%)−

  • [(0.02)·

    (hydrogen uptake in a 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 a unhydrotreated aromatic gas oil as measured by 13C NMR and is at least about 40%, where hydrogen uptake is [ρ

    ·

    659.5·



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