July 2017

Special Focus: Refinery of the Future

Enhanced flash zone design for coker fractionators

Since the flash zone is the first process undergone by the coke drum effluent vapor upon entering the column, the operation of the flash zone is critical to the operation of the entire coker fractionator column.

Since the flash zone is the first process undergone by the coke drum effluent vapor upon entering the column, the operation of the flash zone is critical to the operation of the entire coker fractionator column. The two basic methods used in flash zone design are the conventional process method, and the flash zone gasoil (FZGO) draw-off tray method. The conventional flash zone process method utilizes a heavy coker gasoil (HCGO) or fresh-feed wash spray into the flash zone to condense the FZGO and knock out coke fines from the effluent vapor. The conventional design may utilize trays or shed decks, but does not utilize any draw-off trays beneath the effluent vapor inlet nozzle. This design a

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