Norman P. Lieberman Process Improvement Engineering Metairie, La. Feed interruptions and localized high heat fluxes are common causes of shortened delayed coker heater run lengths. These causes were discussed by operators of delayed coking units who attended a delayed coking seminar held by Process Improvement Engineering in New Orleans in November 1989. Feed interruptions can cause shortened heater run lengths because heater tube-skin temperatures can rise whenever feed flow is reduced or stopped. The higher tube-skin temperatures accelerate coke deposition on the heater tubes, shortening the run length of the heater. Examp...

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