Maximize distillate liquid products

This paper reports that the growing use of heavy crude is making delayed coking more important for increased liquid yields. More cokers are being designed to operate in low pressure and ultra low recycle. The type of projects executed include: traditional revamps for heavy feeds, maximum liquid yield greenfield cokers, true zero recycle-single pass cokers (as opposed to an ultra low recycle coker) and units designed for flexibility in product yield distribution. Although delayed coking has been around since the mid-30-s, the current engineering innovations in design and operation of these units by Foster Wheeler focus on the following: increased fuel coke production, paying greater attention to crude desalting operations, reviewing the impacts of vacuum unit outpoint and preprocessing of feeds, operations involving longer heater run lengths, shorter operating cycles and increased automation, safety and environmental concerns.