The issue of solid content in the slurry after catalytic cracking is modified to a single-pass conversion
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Catalytic cracking unit: excess feed of 100 t/h, slurry reprocessing at 18 t/h, solid content of the slurry 0.45%. To increase gasoline production, the reaction temperature was raised by 20°C; the reprocessing of oil slurry was stopped, and 1.5–2.0 t/h of oil slurry was discharged externally, as there was concern that the solid content in the oil slurry might rise significantly. Question: 1. Is worry unnecessary? 2. Is there a problem with the cyclone in the settler? 3. I’ve seen a set of meal processing equipment with a feed rate of 150 t/h; there is no oil slurry reprocessing, and 1 t/h of material is discarded. The solid content in the oil slurry is 0.4%, and the cyclone efficiency in the settler seems to be too high.
When the solid content of the slurry is high, increasing the amount of material discharged outside helps to reduce coking after stopping the slurry reprocessing process, as well as lowering the regeneration temperature. If the gas generation rate from the heat exchanger remains unchanged, an increase of 20 degrees in reaction temperature will result in a significant increase in the catalyst-to-oil ratio. It is advisable to consider whether it is reasonable to increase gasoline production in such a situation