What is the decoking process?
Decoking is the process of removing coke that has accumulated in coke drums in the coker unit. This is typically done using a hydraulic (high-pressure water) jet to cut the coke.
Which method is used in decoking operation?
Steam-air or thermal decoking is widely recognised as the traditional decoking method. A mixture of steam, air and heat is used to cause shrinkage and cracking of the coke deposits inside the tubes. The steam and air mixture is passed through the coke deposits inside the tube walls whilst they are heated externally.
What is pigging and decoking?
USA DeBusk offers pigging and decoking services for refining and chemical processing applications. This mechanical cleaning service removes fouling that accumulates on the inner walls of furnace coils, boilers and piping systems.
What is a coke drum?
A Coke Drum is a type of pressure vessel that uses heat and pressure to refine complex hydrocarbons into lighter, more useful, products, such as gasoline, diesel, and jet fuel. The coke drum then separates lighter vapors out of the crude, including hydrocarbon gases, naphtha, and light and heavy gas oils.
What is Dechoking?
Decoking is a routine daily occurrence accomplished by a high-pressure water jet. First the top and bottom heads of the coke drum are removed. Next a hole is drilled in the coke from the top to the bottom of the vessel.
What is Coke spalling?
On-line Spalling is an operation carried out in many Delayed Coker Units to remove coke deposits from the inside of coker furnace tube walls. This process is normally used in one furnace at a time of a multi furnace coker while the other furnace(s) remain in service.
Why is it called pigging?
Some early cleaning “pigs” were made from straw bales wrapped in barbed wire while others used leather. Both made a squealing noise while traveling through the pipe, sounding to some like a pig squealing, which gave pigs their name.
What is the purpose of a pipeline pig?
Utility pigs are used for cleaning, dewatering, and sealing of gas pipelines. To flush a gas line, a utility pig sweeps through the internal section, scraping off debris and semi-solids that obstruct or limit the flow of hydrocarbons.
Why it is called delayed coker unit?
A delayed coker is a type of coker whose process consists of heating a residual oil feed to its thermal cracking temperature in a furnace with multiple parallel passes. Delayed coking is one of the unit processes used in many oil refineries. The adjacent photograph depicts a delayed coking unit with 4 drums.
How do cokers work?
A flexicoker includes a coke gasifier that continuously converts the pet coke into a fuel gas, avoiding the need to accumulate coke in a drum and creating a significant source of (low Btu) fuel for the refinery.
What do you mean by spalling?
Spalling is a term used to describe areas of concrete which have cracked and delaminated from the substrate. When steel is cast into concrete, the naturally high alkalinity helps to protect the embedded steel from corrosion.
Which is the most effective method of decoking?
Mechanical decoking or Pigging has been proven as the most effective method of removing internal fouling, coke and scale from the inner surface of fired heater and boiler process tubes. When mechanical decoking using scraper pigs was introduced in the early 1990’s, many refineries were quick to benefit from the clear advantages of this new process.
How does the DDT decoking technology Process Work?
Process – DDT – Decoking Descaling Technology Ltd How the DDT Descaling Decoking Process Works The DDT process begins after the completion of “steaming out” residual feedstock in the assigned heater. Then, Pigg® launchers are installed to the inlet and outlet pipes of the assigned fired heater.
Where does the decision making process in Japan come from?
The decision-making process of Japanese firms has its roots in Japan’s feudal period, when a large proportion of the Japanese population lived in rice farming villages. Due to its economies of scale, rice farming is not something that it makes sense to do on ones own.
What does decoking do to a radiant coil?
The process of gasifying the coke with steam and/or air to remove it from the radiant coils and TLEs is called “decoking.”. The decoking procedure affects the performance of the furnace and the life of the radiant coil.
