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Process

This topic contains 0 replies, has 1 voice, and was last updated by  Anonymous 11 years, 8 months ago.

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    Anonymous

    ~ Consider running between TAR’s with only spalling though a proactive approach

    – EOR = 1175-1200degF
    – 5 years between pigging

    ~ Delta Valve Info

    – During an emergency shutdown, stagnant cooling water froze in the Delta Valve cooling box causing a bulge in the covers.
    – Two instances of transition spool leakage at bottom flange face

    ~ Furnace Fouling

    – Skin TI’s, Delta P

    ~ Reasons

    – Feedstock CCR, Aromaticity, Salt
    – Furnace Hot Spot, Flame Impingement, less XS02
    – Process Low Velocity

    ~ Mitigation

    – Chemicals
    – CZ Alonizing – Inside
    – Recycle
    – Velocity Steam
    – Metallurgy
    – Furnace Design
    – Preheat
    – Outside Coating – Outside

    ~ No technology for venting

    – Getting everyone away from the structure on a routine basis (unheading, cutting, switching)

    ~ Lowering pressure during venting of the drum

    – EPA driven
    – Options:
    – Install liquid ring compressor
    – Install injector

    ~ Foaming/Anti-foaming Injection

    – Injection point 180 degrees from vapor outlet
    – Carrier is HGO and LGO
    – Throttle to hold pressure
    – Standard outage one drum diameter

    ~ Minimum coking time

    – 4 – 6 hours in the drum
    – Achieve minimum temp of 910 to 920 for 30 minutes
    – Restart coking process
    – If too soon into drum, quench and drill

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