Catalytic main air self-protection
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During the self-protective start-up of the coaxial catalytic main air flow, after the two units are disconnected, is it necessary to ensure that the pressure in the regenerator is higher than that in the settler, or rather that the pressure in the settler is higher than that in the regenerator? Thank you so much!
Theoretically, it is not allowed for oil and gas to enter the regenerator under accident conditions, nor for air to enter the settler; therefore, the purpose of controlling pressure is to ensure that these two devices do not interact with each other, thereby preventing catalyst deactivation over time. In practice, however, the required operating pressure is often forgotten
Does shutting off the two valves mean closing the plug valve and the regeneration slide valve? Does \"main air self-protection\" mean letting it flow completely without going into the regenerator? If the main air is completely discharged, won’t the regenerator lose pressure? The settler does not discharge to the flare, and there is still pressure remaining.
After the main air self-protection mode is activated, the feed and slide valve are shut off. The regenerator loses pressure due to the absence of main air pressure, so the settler must be opened to vent pressure through a flare in order to prevent oil and gas from entering the regenerator.
After the main air self-protection system is activated, the main air is not fed into the regenerator, and at the same time the feed to the lift pipe is cut off! Both the pressure in the regenerator and that in the settler decrease; at this point, the flare valve is opened to allow pressure to be released, ensuring that the pressure in the settler remains slightly higher than that in the regenerator
The regenerator no longer has pressure; its main function is to reduce the pressure inside the settler by releasing that pressure. Therefore, it is necessary to ensure that the oil and gas in the settler do not flow into the regenerator.