Process Introduction

Through its constant application and in-depth understanding of the oil refining industry, HollySys has accumulated a wealth of application experience in the oil refining industry. The company has developed a large team of industry managers in the refinery industry. To provide solutions for the client, the company has built-up a unique bank of knowledge pertaining to control and improvements of specific processes, and believes that it will provide the client with more value when compared to ordinary automation companies.

Atmospheric and Vacuum Distillation

Atmospheric and vacuum distillation is also referred to as a primary crude oil processing process, which is the first process after the crude oil enters the oil refinery.

Key Control Solutions Including
  • Atmospheric furnace outlet temperature control and furnace temperature cascade regulator.
  • Vacuum furnace outlet temperature control and furnace temperature cascade regulator.
  • Initial boiling bottom level and crude oil insertion cascade control.
  • Atmospheric top temperature and top return-flow cascade control.
  • Vacuum top temperature and top return flow cascade control.
  • High-pressure gas pressure control.
  • Fuel oil pressure control.

  1.  Oil feed pump,
  2. Heat exchanger,
  3. De-salter,
  4. Heating furnace.
  5. Atmospheric and vacuum distillation column.
  6. Liquid storage tank.
  7. Stripping column.
  8. Condensate cooler.
  9. Vacuum distillation column.
  10. Steam ejector.
Catalytic Cracking

Catalytic cracking is a type of heavy oil weight reduction process to improve the crude oil processing depth at the refinery. Currently, the catalytic cracking equipment is being developed to become more advanced and economically efficient.

The catalytic cracking equipment mainly comprises: Reaction – regeneration unit, energy recovery unit, fractionation unit, and absorbing stabilisation unit. Additional sections include: Desulfurisation unit for dry gas and liquefied petroleum gas, a sweetening unit for gasoline and liquefied petroleum gas, and other sections.

Key Control Programs
  • Reactor oil catalyst temperature control.
  • Settler reserve control.
  • Fractionator bottom level adjustment control.
  • Temperature adjustment control for diesel fuel entering the stripper.
  • Stable overhead liquid hydrocarbon pressure split control.
  • Crude oil temperature cascade control.
Delayed Coking

Delayed coking equipment is for a type of heavy oil thermal processing process, which is a key method for oil refineries to reduce the weight of heavy oil, and improve light oil yield.

Introduction of Control Programs
  • Cascade control of the level control of the fractionation tower.
  • Cascade control of the outlet temperature control of the coke tower.
  • Split control of the fractionation tower crude oil feed temperature.
  • D-1102/B water injection flow single-loop control.
  • Outlet temperature and furnace temperature cascade control for furnace outlet temperature chosen for the cascade control of the heater outlet temperature
  • Furnace thermal efficiency
  • Pressure machine anti-surge control, which can use fixed value flow control and also use the follow-up flow control system.
  • Pressure machine, hydraulic decoking interlock circuit

For hydrotreating, the raw materials are straight run diesel provided by the atmospheric distillation unit and catalysed diesel provided by the catalytic cracking unit. The new hydrogen is provided by the catalytic reform unit. After hydrotreating to generate diesel, it is sent to the blending tank as a high-quality diesel fuel blending component. The refined naphtha sub-product becomes the raw material for the reforming pretreatment unit.

Catalytic Reforming

Catalytic reforming is one of the important secondary processing processes in oil refining. The raw materials are naphtha oil and atmospheric and vacuum oil and gas, and the process produces organic chemical raw materials such as high octane gasoline components and benzene, toluene, and xylene, and also a cheap byproduct which is hydrogen.