January 2001

Process Analyzers

Enhance furnace tube resistance to carburization and coke formation

Applying diffusion coatings on ethylene furnace tubes may increase run times between decoking

Bayer, G. T., Alon Surface Technologies, Inc.; Kurlekar, A., CONDEA Vista Co.

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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