What is the relationship between the ratio of residual carbon to asphaltenes in the feedstock and the formation of pellet coke?
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What is the relationship between the ratio of residual carbon to asphaltenes in the feedstock and the formation of pellet coke? Why is it necessary to keep the ratio above 2? Does the asphaltenes mentioned in the data include resins?
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Bead coking occurs when the API of the feedstock is less than 7 and its residue/asphaltene content is between 1.4 and 1.6; bead coking does not occur when the API is greater than 10 and the residue/asphaltene content is above 2.0. In addition, factors such as the metal content in the feedstock, operating temperature, recycle ratio, and empty tower gas velocity also have an impact on the formation of bead coking.