Fluctuations in the centrifugal separation pressure difference in catalytic cracking regenerators
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Recently, my unit has been experiencing fluctuations in the pressure difference across the regenerator’s centrifuge. The pressure difference across this centrifuge has decreased, along with the pressure differences across the three other centrifuges. The inlet and outlet pressures of these three centrifuges have increased, as well as the temperature of the waste tank connected to them. There is no significant change in the pressure within the regenerator itself. Is the problem related to the regenerator or to the flue gas system?
Based on the trends at these points, it is suspected that backpressure in the flue gas pathway is the cause
The observed phenomena cannot be analyzed clearly. Check whether it’s the triple rotor or the critical nozzle that’s having the problem.
From what you’ve described, it seems to be a problem with the smoke gas pipeline
If there are no significant fluctuations in the operation of the exhaust fan, then it must be a problem with leaks in the critical nozzle or the valves of the waste agent tank!
Do your units have online analyzers for the three swirl inlets and the flue gas inlet? If so, do they increase the value?
What is the processing capacity of your unit? What type of unit is it? What is the desired regenerator inventory level? If the current inventory level is set too high, it can be appropriately reduced
It’s a 1.2 million-ton unit with stacked upper and lower sections; it has calcining pots and a secondary fluidized bed (connected via a large-pore distribution plate). The butterfly valves are located within the secondary fluidized bed. If the inventory in the secondary fluidized bed decreases further, the reaction temperature will become unstable
If it’s caused by the regenerator, then when the inlet pressure of the cyclone separator rises, the pressure difference across the cyclone should also increase
You can try lowering it a bit