How to reduce the dry gas yield in coking units
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The residue value of the feedstock used in our company’s delayed coking unit is around 17%; the high degree of cracking of the feedstock results in a dry gas yield of about 5.5%. Can increasing the residue value reduce the dry gas yield?
Increasing the yield of residual carbon liquid results in a decrease, while coke formation increases
Reduce the circulation ratio and furnace outlet temperature; lowering the system pressure reduces the reaction depth
The level of dry gas production is related to the properties of the raw materials, the degree of reaction, and the absorption and desorption processes. Whatever the reason, it is not acceptable to reduce dry gas production at the expense of product yield. The best approach is to calibrate the equipment and optimize the operating conditions, ensuring that liquid recovery and the production of the target product are at their optimal levels. If the amount of dry gas remains high, causing difficulties in operating the absorption tower, then technical modifications to the tower should be carried out to meet the required standards.