What are the reasons for the high gas yield in hydrocracking units? How should adjustments be made in practical operations?
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What are the reasons for the high gas yield in hydrocracking units? How should adjustments be made in practical operations?
First is the issue of raw materials; if there are many light components in the raw materials, and these light components tend to crack, it results in the production of a large amount of gas. Secondly, it has a high conversion rate and produces a large amount of gas. Additionally, a large reflux flow or high temperature at the top of the fractionation tower can also result in an excess of gas.
It is related to the type of hydrocracking catalyst used in the cracking section. If less gas is produced, it is recommended that, once the conversion target is reached, efforts be made to avoid excessively high temperatures, especially at the outlet of the final bed layer.
This is related to the raw materials, reaction conversion rate, and the operations in the distillation section. It is recommended to lower the reaction temperature, reduce the conversion rate, and produce more intermediate distillate oil ； The distillation section increases the extraction of jet fuel and diesel.