Poor fluidization in the catalytic regeneration inclined tube

First, it is necessary to control the reaction temperature below 470°C; if it drops further, oil contamination is likely to occur, so reduce the dosage first to maintain the reaction temperature. Then proceed to adjust the fluidization state: 1. Check for loose areas; if there are any blockages, they must be cleared. 2. Adjust the material levels at various locations; for example, shift the material level in the reaction stripping section slightly towards the regenerator, or reduce the material level in the external heat exchanger – any of these adjustments can be tried. 3. Set the PID parameters for the regeneration slide valve, with the integration time set to a value greater than 5 minutes. 4. If the system’s catalyst stack ratio is too high, some catalysts with a lower stack ratio should be incorporated.

If this happens, should we consider shutting off the feed? A reduction in volume is certain, but stopping the feed comes at too high a cost. If the feed is cut off, what should be done next?

1. Increase the pressure and volume in the regenerator, or reduce the pressure in the settler to increase the driving force. 2. Check the density of the regenerative inclined tubes; it is generally between 450–600 kg/m3. The density can be adjusted by changing the amount of gas used for loosening or by disabling the loosening mechanism

The fluidization in the regenerated inclined tube is poor. If reducing the flow rate can maintain the reaction temperature, there is no need to stop feeding. Besides the high costs associated with stopping feeding, how can one adjust the fluidization condition properly? With feed and without feed, the situation is very different. To adjust the fluidization of the regenerative inclined tubes, it is obviously necessary to do so while both units are in a fluidized state. There are many methods, including adjusting various loosening points; some can even be temporarily turned off to observe the effects. Overall, cutting off the feed doesn’t make much sense; in my opinion it simply leads to poor fluidization. There’s no need to worry – with patience and proper adjustments, it can always be fixed.

When the temperature drops below 470°C, it’s time to cut the material, as the reaction conditions are no longer favorable.

Increase the pressure difference, enhance loosening, and boost the regenerator’s storage capacity

From Narrative Analysis 1, let’s first consider, from the perspective of fluidization, whether adjusting the regenerated inventory and regeneration pressure changes the fluidization state of the turbulent bed in the regenerator Adjust the loose points of the regenerative inclined tubes to ensure proper fluidization of the gas stream. Consider the water content of the loose medium and the water content of the pre-lift steam. 2. If everything was working normally before, and the change occurred recently without any significant adjustments to the device. Consider equipment issues such as damage to the pre-lift section or pre-lift nozzles; observe the burning conditions at various temperature points in the regenerator, and determine whether there is any damage to the regenerator equipment or flow deviation. 3. If adjustment is not possible, check the instruments and equipment; operations should be halted for an inspection of the equipment. When the pressure difference before and after the regenerative slide valve drops to 15 KPa, and the reaction temperature is below 470°C with no possibility of recovery in the short term, the feed should be stopped to maintain the pressure difference between the two vessels, allowing fluidization to be re-established in them. Just handle it by following the principle of cutting off the feed and retreating. There’s no need to consider reducing the feed rate to maintain the reaction temperature; all of that is just theoretical talk and not practical. Because the differential pressure before and after the regeneration slide valve drops to 15 KPa.