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 is coke removed from coke drum?
A coke drum is usually on-stream for about 24 h before becoming filled with porous coke and the following procedure is used to remove the coke: (1) the coke deposit is cooled with water; (2) one of the heads of the coking drum is removed to permit the drilling of a hole through the center of the deposit; and (3) a …
How does a coke drum work?
With delayed coking, two or more large reactors, called coke drums, are used to hold, or delay, the heated feedstock while the cracking takes place. 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.
What is Unheading valve?
Bottom Unheading Valve. The bottom unheading valve connects to the transition spool and creates a totally enclosed system from the coke drum to the discharge chute. With the push of a single button from a remote location, safe and reliable unheading can be achieved.
What is the difference between Flexicoking and fluid coking?
Fluid coking can process heavier VDR and gives a higher distillate yield (and lower coke yield) than delayed coking. Depending on the demand, the flexi-coking process can produce both fluid coke and fuel gas, or gasify all the coke to produce only fuel gas.
What is coking and decoking?
petroleum refining In petroleum refining: Visbreaking, thermal cracking, and coking. 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 in the refining process?
Petroleum coke, or petcoke, is a product produced from all types of oil (light/heavy crudes) during the oil refining process. Many different products are extracted from a barrel of crude oil in addition to gasoline, diesel and jet fuels. Petroleum coke just one of the many.
What is banana effect in coke drum?
A mechanism which will cause the drum to tilt is uneven temperature distribution on the drum which will cause the drum to bend during the coking cycle referred to as the “banana” effect. To demonstrate this effect, we simulated an exaggerated temperature distribution on opposite sides of a coke drum.
What is a tarry drum?
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. The top and bottom of the drum are opened at the completion of the cooling cycle, and the solid mass of coke is then cut into pieces and removed from the vessel.
Why is it called delayed coking?
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 is it called coking?
The industrial production of coke from coal is called coking. The coal is baked in an airless kiln, a “coke furnace” or “coking oven”, at temperatures as high as 2,000 °C (3,600 °F) but usually around 1,000–1,100 °C (1,800–2,000 °F).
What is Decoking drum?
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.