Urgent help needed – an explanation of experience in operating coking units! !

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The delayed coking unit of Sinopec Tianjin Branch has a production capacity of 1.2 million tons per year, with a recycle ratio designed at 0.4. Through research on their operations, several production experiences were identified in their standard procedures. Due to my limited knowledge, it seems that there is no theoretical basis for these practices. I would appreciate everyone’s insights and opinions on these experiences, as well as any suggestions for improvements. Comments and discussions are welcome. (1) For fresh residue feed, every 10°C increase in the temperature of the oil and gas pipelines in the coking tower results in a 1.44% decrease in coke yield (in terms of quality). (2) For every 10°C increase in the temperature of the oil and gas pipelines in the coke tower, the yield of gas oil and distillate oil increases by 1.93% (by volume) relative to the feedstock. (3) For every 1% decrease in volatile combustibles (by mass), the temperature of the oil and gas pipelines in the coke tower increases by 3.9–5.0°C. (4) Reducing straight-run gas oil by 10% in the coking feed reduces the coke yield by 1.5% (on a mass basis) relative to the feed. (5) The cycle time is reduced by 6 hours, and the volatile combustibles in coke increase by 1.0% (by mass).