How is the operation of the flue gas extractor maintained after catalytic cut-in feeding
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How can the flue gas extractor remain in operation after the catalytic unit has been shut off from feed for an extended period?
1. Before initiating catalytic cutting, make preparations to shut down the system. 2. As the amount of reactant fed into the system decreases, gradually reduce the operation of the flue gas valve and increase the operation of the double-acting slide valve, thereby starting a slow cooling process. 3. When the flue gas flow rate drops to 70% of its normal level, shut off the flue gas valve; supply steam for cold cutting in idle mode, and stop supplying normal steam for cold cutting. 4. When the temperature of the regenerator reaches 200 degrees, stop the main fan motor. 5. Activate the bypass circuit of the flue gas fan for testing purposes. 6. Stop the lubrication system when the temperature of the bearings falls below 50 degrees. 7. Rotate the shaft of the equipment. 8. Shut off the steam used for cold cutting of the flue gas fan, stop the sealing system. What’s been mentioned above covers everything; I’ll add a few more points: when feeding is stopped for an extended period, the regenerator operates in single-unit fluidization mode. The flue gas fan is shut off, and the air supply for regeneration comes either from the main unit or from a backup unit. Burning oil is injected into the regenerator to maintain the bed temperature. Is this approach feasible?
If the main air supply is normal, the bed temperature can be controlled by injecting combustion oil; the flue gas exhaust fan can continue to operate, and the high-temperature butterfly valve can be adjusted as appropriate； Due to the decrease in flue gas inlet temperature, the median value will change, and the vibration of the unit may also change.
It can be maintained, but not for too long; in our case we can hold on for at most 48 hours
Spray burning oil, or simply turn off the smoke extractor