Coking Process by Lummus Technology

Conversion of atmospheric and vacuum residues, hydrotreated and hydrocracked resids, asphalt, pyrolysis tar, decant oil, visbroken or coal tar pitch, solvent-refined and Athabasca bitumen.

Feedstock is introduced (after heat exchange) to the bottom of the coker fractionator (1) where it mixes with condensed recycle. The mixture is pumped to one of two coke drums (3) through the coker heater (2) where the desired coking temperature is achieved. Steam or boiler feedwater is injected into the heater tubes to prevent coking in the furnace tubes. Coke drum overhead vapors flow to the fractionator (1) where they are separated into an overhead stream containing the wet gas, LPG and naphtha and two gasoil sidestreams.

The overhead stream is sent to a vapor recovery unit (4) where the individual light product streams are separated. The coke that forms in one of at least two (parallel connected) drums is then removed using high-pressure water. The plant also includes a blow-down system for recovery of all vent gas and slop streams, coke handling and a water recovery system.

Licensor: Lummus Technology, a CB&I company.

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