What is coke drum Unheading?

DeltaValve’s bottom unheading valve permanently connects to the coke drum, creating a totally enclosed system from the coke drum to the discharge pit. Utilizing patented dynamic seat technology, the device is tight-sealing, robust, and highly reliable.

How does a coke drum work?

coking. …a large vessel called a coke drum for extensive and controlled cracking. The cracked lighter product rises to the top of the drum and is drawn off. It is then charged to the product fractionator for separation into naphtha, diesel oils, and heavy gas oils for further processing in the…

What is a tarry drum?

After a drum is filled, the flow of oil is diverted to a freshly emptied vessel. The full drum contains a tarry mass, which solidifies to a coal-like substance (coke) when cooled by the addition of steam and then water.

How does a refinery coker work?

In a refinery, the coker is the most extreme of the bottoms upgrading process units. A coker takes the lowest value bottoms material (vacuum resid) and cracks it to the point that all of the resid is eliminated, yielding only lighter fractions and solid carbon (pet coke).

What is a delayed coker unit?

A delayed coker is a type of coker whose process consists of heating the residual oil feed to its thermal cracking temperature in a multi parallel pass furnace. This cracks the long chain heavy carbon and hydrogen molecules of the residual oil into coker gas oil and pet coke.

How is coke removed from coke drum?

Coke is deposited in the coke drum as a solid. This solid coke builds up in the coke drum and is removed by hydraulically cutting the coke using water.

Why is it called delayed coker?

Refineries commonly employ one of three types of coking processes: Delayed coking—a thermal cracking process that converts residuum into gasified product streams and concentrated carbon coke. It is called “delayed coking” because cracking takes place in a coke drum rather than in a furnace or reactor.

Why multiple coke drums are used in the delayed coking process?

To allow continuous operation, two drums are used—while one is on stream, the other is being cleaned. The temperature in the coke drum ranges from 415°C to 450°C (780°F to 840°F) at pressures from 15 to 90 psi.

What is Flexi coking?

Flexi-coking, as a variation of fluid coking, provides the options of partial or complete gasification of the coke product to produce a fuel gas with some or no coke in the product slate.

What is coker use for?

A coker or coker unit is an oil refinery processing unit that converts the residual oil from the vacuum distillation column into low molecular weight hydrocarbon gases, naphtha, light and heavy gas oils, and petroleum coke.

What are coke deposits?

Coke is the solid residue created when oil undergoes severe oxidative and thermal breakdown at extreme engine temperatures. The higher the temperature, the harder, blacker and more brittle the coke/deposit residue. Coking performance of oils varies based on formulation and the engine environmental conditions.