Applying diffusion coatings on ethylene furnace tubes may increase run times between decoking
In this case history, the CONDEA Vista's facility at Westlake,
Louisiana, applied a diffusion coating to the ID of ethylene tubes
for a full-furnace trial. The furnace had a 24-coil design with a
serpentine-type mode and four radiant passes. Each coil has a
double pipe quench exchanger. The outlet of each quench exchanger
goes to a common coke-collection header and then to a secondary
transfer line exchanger. Also, this furnace uses a combination of
floor and wall burners.
Each coil uses both HK-40 and HP niobium (Nb) modified
microalloyed (HP Nb MA) alloys. The first two radiant passes of the
coil are cold passes; these passes are made of HK-40 tubing and
return bends. The l
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