Operating procedures for thickening catalytic cracking feedstock oil
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What changes occur in operation when the feedstock for catalytic cracking becomes heavier? I hope everyone will contribute their ideas and work together to learn and improve! 1. Reduce the processing volume. 2. Lower the preheating temperature of the feed oil and increase the catalyst-to-oil ratio. 3. Use an inhibitor and raise the reaction temperature. 4. Accelerate catalyst coking. 5. Improve catalyst activity. 6. . .
In operation, as the raw material becomes heavier, the regeneration temperature rises; if this is not adjusted in time, accumulation may occur. In devices that use oxygen-enriched regeneration, the oxygen content decreases, and it becomes easier for the regenerator to absorb heat, which can lead to tail burning. In terms of product distribution, at the same conversion rate, the production of coke and gas increases while the diesel yield decreases. In such cases, if there is a reprocessing unit available, it is possible to reduce the amount of oil that needs to be reprocessed, thereby preventing excessive coke formation and increasing the overall conversion rate. As the unsaturation of the product increases along with the olefin content, it is necessary to add freshening agents appropriately, and devices equipped with heat exchangers should increase the external heat extraction. The heat in the fractionation tower increases, and the dry point of gasoline decreases when temperature control remains unchanged.
Moreover, in devices for oxygen-deficient regeneration, improper adjustment can easily lead to accumulation. If heat is not removed in time, an excess of heat can cause the regenerator to overheat.