Catalytic cracking combustion oil

At the start of operation, once the regenerative reserve reaches the level required to seal the combustion oil nozzle, combustion oil is injected. The pressure of the atomized steam is slightly higher than that of the burning oil.

During the startup of the catalytic unit, once the catalyst has been loaded and the material legs are sealed, the loading speed can be reduced, as less catalyst will leak out at this point. It is necessary to raise the temperature as much as possible at this stage, because the temperature of the regenerator drops after catalyst loading (this may not be a problem if the catalyst tank was not emptied during shutdown, such as through tank dumping; otherwise, the catalyst temperature will be low). The temperature should be raised to the auto-ignition point of the combustion oil (usually 380 degrees). Once it is confirmed that the level of catalyst in the regenerator is more than 2 meters above the oil nozzles, the combustion oil can be injected. After the bed temperature rises, loading can be carried out intermittently, followed by catalyst turning and fluidization, before starting the operation with oil injection.

When starting to add the catalyst, significant losses occur due to the unsealed material legs; therefore, it is necessary to first raise the bed temperature and add the catalyst rapidly. Once the material legs are sealed, the addition rate of the catalyst should be reduced, with an emphasis on raising the temperature. It is important to ensure that the level of material in the bed is above the combustion oil nozzles, and that the bed temperature is above 380°C. After adjusting the misting steam properly, the combustion oil can then be used!

Spray combustion oil when the temperature is low, haha! When the bed temperature of the regenerator drops rapidly for some reason and thermal balance cannot be maintained, it is necessary to inject combustion oil. During startup, there is an auxiliary combustion chamber, so additives can be added without concern. Once the accumulation of material covers the wing valves of the secondary centrifugal separator, the speed can be reduced. With an auxiliary combustion chamber in place, the bed temperature generally won’t drop too low. When the accumulation of material covers the combustion oil nozzles, it’s then possible to inject combustion oil; it’s important to monitor the oxygen content in the flue gases to ensure it isn’t too low. Spraying burning oil is prohibited during shutdown and agent removal