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Delayed Cokin

Lummus Technologys proprietary delayed cokingtechnology is one of the most cost effective routesfor converting/ upgrading heavy residual stocks to

more valuable lighter distillate products and coke.

The current design is based on several decades ofcontinual refinement and accumulated data fromover 60 commercial installations. Lummus delayedcoking technology emphasizes high reliability andflexibility while meeting todays more rigorousenvironmental and safety requirements.

Advantages

The delayed coking unit design features onlcomputer control, automatic unheading, singledouble fired heaters, state-of-the-art coke dru

mechanical design, and an innovative watermanagement/coke recovery system. Theprocess can handle a variety of feedstocks, suas petroleum derived resids, cracked materials(pyrolysis tar and cycle oils), and liquid feedstocderived from coal.

The Lummus Technology design maximizesdistillate yield while achieving the specificationrequirements of the downstream hydroprocessiunits.

Overview

Process Features

Extensive commercial and pilot plantdata base; predictive tools

API sludge disposal process

Special coking heater design

Online heater decoking

Proprietary coke pit/pad and coke drumstructure design

Automated flange unheading system

Advanced control system

Environmentally advanced design

Coke drum mechanical design

Low recycle design

Process Benefits

Optimizes operating conditions and product slate

Provides sludge disposal capability

Maximizes run length High efficiency

Higher on-stream factor

Reduced investment and maintenance costs

Enhanced operational safety Shorter cycle time

Operating cost savings

Reduces fugitive emissions and waste effluents

Maximizes drum life for all drum sizes

Maximizes distillate production

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www.CBI.com/lummus-technologyOnly employees, agents, or representatives authorized under and pursuant to written agreement

with CB&I are authorized to distribute this brochure to an actual or potential client of CB&I.

Copyright 2012 by Chicago Bridge & Iron Company. All rights reserved.

Delayed Coking

Delayed coking is a semi-batch process usingalternating drums that are switched off-line afterfilling. Support facilities include closed blowdown,coke cutting and handling, and a water recoverysystem.

Hot residual oil is fed to the bottom of thefractionator where it mixes with condensedrecycle. The combined stream is heated in thefurnace to initiate coke formation in the cokedrums. Coke drum overhead vapor flows to the

Process

Description

fractionator where it is separated into wet gas,unstabilized naphtha, light gasoil, heavy gasoil,and recycle.

During the coke drum steam out and coolingperiod, all steam and hydrocarbon vapors are

directed to the blowdown system where theyare recovered. After the coke drum cooling cycleis complete, the coke is hydraulically cut fromthe drum and dropped into a pit or pad, wherewater is separated from coke and recycled.

From extensive pilot plant and operatingexperience, Lummus Technology hasdeve lope d a correlation package andcomputer software to predict delayed coking

yields and operating conditions for a widevariety of feedstocks and productrequirements. For unusual feedstocks,Lummus pilot plant can be used to obtain designyields.

Predictive

Tools

Process Flow

DiagramWet Gas

ReflexDrum

Gasoil

Stripper

Fractionator

Heater

Coke

Drum

Coke

Drum

Residual Oil

Unstabillized

Naphtha

Light Gasoil

Heavy Gasoil