Catalytic cracking unit diesel extraction zone with catalyst
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Recently, my diesel system produced some catalyst; I was wondering if anyone knows what could be the cause of this
1. The amount of slurry reflux returning to the tower is too low. 2. The amount of recycled oil returning to the tower is too low. 3. The intermediate-stage reflux leads to excessive evacuation. 4. There are trays that have been overturned; in short, it is due to a deterioration in the washing effect.
Agree with what was said above. The key issue is that the amount of slurry returning to the tower is too small, or there is a sudden surge of slurry into the tower.
The distillation column operation in the poster’s setup may experience column over-pressurization
The operating conditions of the reaction process should be taken into consideration; generally, this phenomenon does not occur as long as there are no significant fluctuations in the distillation process.
Has the quality of diesel always been satisfactory? Is the gas-phase load high?
What is the solid content of your slurry? This situation would occur if the solid content of the slurry is too high and the amount returning upward is low, right?
It must have been caused by the tower impact. It is suggested that the poster provide more details about the situation.
The answers on floors 2 and 3 are correct. Additionally, the original poster should provide more details: 1. Does this phenomenon occur continuously or only occasionally? 2. What is the solid content of the slurry? 3. Has there been any significant change in the reaction pressure? 4. What is the amount of slurry that flows upward and downward within the tower?
The amount of slurry that returns to the tower serves to flush out the catalyst carried by the superheated oil and gas; if this amount is too small, some of the catalyst will be carried by the oil and gas to the upper trays of the tower, which not only leads to tray blockage but also affects the quality of the product.
1. The amount of slurry reflux returning to the tower is too low. 2. The amount of reprocessed oil returning to the tower is too low. 3. Evacuation of the mid-section reflux stream