Pressure control issue in catalytic cracking with parallel high and low pressures
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Why should the pressure in the regenerator be kept higher than that in the settler during normal operation?
Ensure normal fluidization of the two reactors, and prevent reaction gases from flowing back into the regenerator and causing accidents
Maintaining a normal pressure difference between the two vessels ensures proper catalyst circulation; the material levels in these vessels are not emptied by pressure, which in turn prevents the oil and gas from mixing improperly. If a negative pressure difference arises during normal operation, allowing oil and gas to enter the regenerator, the bed temperature of the regenerator will rise rapidly, and yellow smoke will be emitted from the chimney – this is extremely dangerous
In the high-low parallel configuration, the regeneration inclined tubes are generally longer, which helps maintain a high regeneration pressure and facilitates the fluidization of these tubes during regeneration
Even in the coaxial type, it is required that the pressure in the regenerator be higher than that in the settler； The pressure difference between the two vessels is an important control parameter in the reaction unit; a stable pressure difference facilitates fluidization in both vessels.