Hot topic: The company’s plan to increase gasoline production
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The headquarters determines the amount of crude oil that each company is allowed to produce based on two criteria: the diesel-to-gasoline ratio and economic efficiency, which has resulted in a rather challenging gasoline production task for our company； To implement the overall business strategies set by the headquarters, our company will take the following measures to fully exploit the potential for gasoline production, thereby ensuring the fulfillment of the gasoline production plans. 1. Control the output of straight-chain diesel and increase the feed to the catalyst. The atmospheric tower can appropriately reduce the amount of vapor at the bottom of the tower, increase the proportion of components with temperatures below 350°C in the atmospheric residue, thereby reducing diesel production, increasing wax oil production, and raising the total feed volume to the catalyst ； The 95% point of straight-run diesel can be temporarily controlled at 325°C ± 10°C. 2. Optimize catalytic operations to increase gasoline production. Appropriately increase the reaction depth while ensuring the stable operation of the catalytic cracking unit. The temperature of the catalytic reaction has been increased from the current 500–505°C to 505–510°C. The temperature in the gasoline riser has been reduced from the current 520°C to around 490°C, and the load on the gasoline riser is operated at its minimum level (at 60% of the design load) ； The control target for the dry point of catalytic gasoline has been raised from the current 195±3°C to 200±3°C, with efforts made to maintain it at the upper limit. 3. Diesel hydrogenation unit: The dry point of crude gasoline is controlled at 161±4°C. 4. Increase the yield of reformed product oil to create conditions for gasoline blending. 5. Regulation of coking unit operation: The dry point of coking gasoline is controlled at 205±5°C, while the 95% cut point of diesel is temporarily controlled at 320°C±10°C. 6. Further explore the potential of gasoline blending components, and make full use of existing inventory resources such as purchased aromatics, chemical fiber distillate oil, and hydrogenated naphtha to produce gasoline. 7. To fully tap the potential for gasoline production and make optimal use of the process advantages of FDFCC, one approach is to increase the production of liquefied gas from the gasoline produced through this process ； Second, the gasoline riser must be able to operate at a minimum load. To this end, it is necessary to modify the composition of the gasoline lift pipe feed in order to increase gasoline production by primarily cracking diesel components. Given that coker diesel contains a high proportion of saturated hydrocarbons as well as many olefins, it is more suitable for catalytic cracking reactions than catalytic diesel. Therefore, a step-by-step approach is adopted to introduce coker diesel components into the secondary catalytic gasoline lift pipe for catalytic cracking, thereby further increasing gasoline production. 8. Increase the dry point of coker crude gasoline. Gradually increase the dry point of coker crude gasoline from the current 210±5°C to 230±5°C℃ ； The coking plant adjusted the operation of the distillation tower in a timely manner; the catalytic plant kept the reaction temperature in the gasoline riser at 490°C and maintained the minimum load on the gasoline riser, thereby reducing the amount of catalytic crude gasoline promptly.
Our approach is also to lower the dry point of diesel (in coking units)
We have also increased the top temperature of the distillation column from 110 degrees to 130 degrees.
We control the dry point of our gasoline at 230 degrees
Will the current approach of producing more gasoline and less diesel necessarily reduce the octane rating of gasoline and the cetane rating of diesel?
The dry point of coker gasoline has been changed from being controlled at no more than 230°C to no more than 240°C.
Yes, driven by market conditions, everyone is discussing ways to increase gasoline production.
The temperature of the gasoline lift pipe can be reduced to around 450°C in order to minimize excessive cracking of gasoline, increase the yield of gasoline, and reduce the yields of liquefied gas and dry gas. It is also possible to consider injecting a cold medium into the upper middle section of the main lift pipe to reduce the secondary cracking reaction of gasoline in the main lift pipe.
The catalytic unit adopts a gasoline-intensive approach, typically by increasing the reaction depth, that is, by directly raising the reaction temperature, to increase gasoline production. Fractionation appropriately increases the top temperature of the tower, raises the dry point of gasoline, and elevates the initial boiling point and flash point of diesel, thereby increasing the yield of gasoline. At the same time, catalysts with high activity and good selectivity are used to increase gasoline yield.