The increasing quality and inferiority of the world's most advanced resources, especially the cost advantage brought by the processing of heavy quality**, has led to the fact that about 42% of the world's petrochemical refining enterprises (about 2 3 refining enterprises) tend to increase the proportion of heavy ** in the processed raw materials [21], and the amount of inferior residue produced will inevitably increase. Statistics for 2023! It shows that the annual processing volume of global residue has reached 82.5 billion t.
In recent years, China has gradually established and expanded energy cooperation with Venezuela, Canada and other countries. Heavy oil such as Venezuelan overweight** and Canadian oil sands asphalt is likely to become an important replacement resource for processing raw materials for China's oil refining enterprises in the future[5]The residue oil greater than 500 of these heavy ** has high output, difficult processing and low application value. One of the main challenges faced by China's petrochemical refining enterprises is how to maximize the processing and utilization of these precious petroleum resources, improve resource utilization efficiency and increase economic benefits while meeting the growing demand for light transportation fuel oil.
Delayed coking process, no catalyst is used in processing, the process is relatively simple and mature, the investment is small, especially suitable for lightening inferior residue characterized by high residual carbon, high asphaltene, high heteroatoms (sulfur, nitrogen, oxygen) and high metals (such as: nickel, vanadium, etc.). However, in the actual processing process, the increase of asphaltene and heteroatom content in inferior residue will seriously affect the coking morphology of green coke, and significantly increase the probability of shot coke in the coke bed of coke tower. Compared with ordinary petroleum coke (also known as sponge coke), projectile coke is difficult to sell, low economic value, basically can only be used as fuel required for power generation, compared with 1A grade petroleum coke per ton** difference of more than 500 yuan, refining enterprises with million tons of coking units due to the generation of projectile coke caused direct economic losses of up to 350,000 yuan. At the same time, the generation of a large number of projectile coke in the coke tower will also bring a series of production and safety problems, for example, the coke tower will produce a "surge" phenomenon in the production process, resulting in abnormal shaking of the tower body and shortening the service life of the coke tower. Therefore, in view of the strategic significance of coking morphology regulation to improve the production and operation capacity of refining enterprises, it is of great practical economic significance to explore the internal factors affecting coking morphology.