Delayed coking technology for zero-fuel oil production

Maximise production flexibility and sustainability while improving margins

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The challenges

As the world pivots toward a net-zero future, the industry is faced with global challenges. Refiners are struggling to improve margins while transitioning to cleaner energy and adapting to a changing energy landscape.

One area where there is a clear transition is the demand for electric vehicles (EVs). With increasing EV adoption, conventional transportation fuel will continue to decline, while the requirement for synthetic graphite used in battery manufacturing is expected to grow.

Additionally, with more than 260 million tons of plastic waste is produced globally every year and only around 16% being recycled, the excess is either incinerated, contributing to greenhouse gases or ends up in landfills and oceans.

Retrofitting solutions for more sustainable refineries

Wood’s selective-yield delayed coking technology (SYDECSM) is the leading method for residue upgrading for zero-fuel oil production. It provides refiners with the flexibility to utilise a variety of residues in their cokers to reduce waste and support energy transition objectives.

Solutions include:

  • High return on investment and low CAPEX revamps
  • Recycle plastic / rubber and renewable pyrolysis oil processing in delayed coker
  • Used lubricants re-refining to produce IMO compliant low-sulfur fuel oil (LSFO)
  • SDA revamps for heavy lube stocks production
  • Digital solutions and technology to optimise unit operation and uncover easily achievable revenue improvements
  • Due to the pandemic and the decrease in demand for transportation fuels, delayed coking units (DCU) are not operating at their design capacities. To address this challenge, Wood is applying our existing SYDECSM technology to help clients repurpose existing cokers for a more sustainable future.

    SYDECSM advantages

    Due to our extensive delayed coking licensing and design experience, we can design units tailored to individual refinery needs.

    Our designs include production of all types of coke morphology such as fuel, anode, and needle coke. Our robust technical components and an 80-year history in delayed coking design with over 3 million BPSD of installed coking capacity helps to cement our leading position in this area.

    Our specialists continue to improve refining technologies and adapt them to changing market conditions to protect and ensure our clients’ return on investment.

    Technological benefits

    · Easy integration to enable processing of heavier cheaper crudes

    · Complete residue conversion, including low-value residues to high-value fuels thereby maximising profits

    · Yield selectivity to maximise distillate production for improved profitability

    · Feedstock flexibility to process residue, pitch, decant oil, pyoil, plastics, and/or partially converted materials

    · Proprietary TerraceWallTM delayed coker heater, a sloped wall double fired heater for extended run-lengths between spalling and turnarounds for greater onstream time and lower maintenance costs

    · Designed to maximise operator safety with open coke drum structure layout, improved egress, sophisticated coke drum and heater interlocks, and slide valve unheading

    · Proprietary centre feed device for coke drum feed entry to improve drum life to minimise hot spots and banana effect

    · Environmentally friendly process with no continuous slops, fully enclosed blowdown system, and clean coke handling systems leading to reduced emissions

    Where Wood adds value

    Improved reliability, operability and efficiency

    • Proprietary TerraceWallTM double-fired heater
    • Advanced coke drum design
    • Fractionator wash zone sprays and fines removal
    • Low-pressure, ultra-low recycle
    • On-line spalling/pigging
    • Run lengths of five years or more between turnarounds · Digital delayed coking for remote on-line monitoring and optimising

    Safety in design

    • Slide valve unheading system
    • Extensive safety interlocks to prevent maloperation
    • Improved deck layout and better safety egress
    • Full coker automation available
    • Coke drum life monitoring program
    • Centre feed device for drum feed entry

    Environmentally friendly process

    • Low-sulphur fuel gas production
    • Enclosed coke transport and storage
    • Enclosed blowdown recovery systems
    • Clean coke handling systems
    • Waste by-product processing including slops and sludge
    • Water minimisation
    • Improved heat integration

    Reduced technology risk and interface with full life cycle support

    • Feasibility studies
    • Process design packages
    • Front-end engineering design (FEED)
    • Detailed engineering
    • Procurement and construction (EPC)
    • Construction management

    We provide unit checkout, commissioning, start-up and operations assistance, and comprehensive training (operations, maintenance, operator training simulator).

    Our team also delivers aftermarket service through technical service agreements for ongoing continuous support leading to optimised operations, extended heater run length, and enhanced reliability of coke drums for longer drum life.

    Get in touch
    Srini Srivatsan
    Director, Coking Technology