Petroleum coke is the abbreviation of coke or petcoke, is a final carbon-rich solid byproduct of oil refining process produced by Petroleum coke grinding mill, and can be used in carbon, cement, chemical, smelting and other industries. The usage of petroleum coke is determined by its classification. There are mainly four classifications of petroleum coke.
1. Classification according to the coking method:
It can be classified into delayed coke, open hearth coke, kettle type coke, fluidized coke. Delayed coke is commonly seen.
2. Classification based on the heat treatment temperature:
It can be divided into raw coke and calcined coke. The raw coke contains a large amount of volatiles, with low mechanical strength. The calcined coke is produced by calcinating the raw coke, with high mechanical strength.
3. Classification in accord with the content of sulfur:
It can be divided into high sulfur coke, medium sulfur coke and low sulfur coke, which is determined by the sulfur content of raw materials. The higher the sulfur content, the lower the quality of petroleum coke. Chinese quality standards for petroleum coke are as follows:
No. 1 coke: A coke sulfur ≤ 0.5%; B coke sulfur ≤ 0.8%
No. 2 coke: A coke sulfur ≤ 1.0%; B coke sulfur ≤ 1.5%
No. 3 coke: A coke sulfur content ≤ 2.0%; B coke sulfur content ≤ 3.0%
Classification based on the appearance and performance
It can be divided into spongy coke, honeycomb coke and needle coke.
Needle coke is also known as high-quality coke, produced from Petroleum coke Raymond mill with obvious needle-like structure and fiber texture, mainly made of residual oil with high aromatic content and low content of non-hydrocarbon impurities.
Spongy coke: Also known as ordinary coke, with high sulfur content and water content, rough surface, price is relatively higher than others.
Honeycomb coke: Shape in spherical, the diameter is generally 0.6mm to 30mm, low water content. It is generally produced from the residual oil with high sulfur content and high asphaltene residue.