Requirements and operating procedures for a clogged regenerator bed

This post was last edited by Qingpingguo419 on 2010-8-28 at 22:41. Bed clogging mainly occurs when feeding material cannot be supplied immediately, such as in cases of steam interruptions, major power outages, failures of critical pumps or main fans, and so on. When fluidizing after bed shutdown, it is essential to ensure that all backflow paths are unobstructed, so that accident steam from the main air supply does not enter the regenerator (this helps with rapid cooling). If the temperature of the regenerator has dropped to a low level, burning oil should be injected as soon as air is introduced, because although the indicated temperature of the regenerator is low, the temperature of the catalyst at the bottom of the regenerator remains high. Using forced air to bring this hot catalyst to the surface and then injecting burning oil is sufficient; there is no need to activate the auxiliary combustion chamber. 1 Transfer the catalyst stored in the settler to the regenerator to prevent catalyst and sludge from accumulating in the stripping section of the settler. 2 Isolate the two reactors from each other. 3 Gradually remove the main air from the system (close the emergency valve for main air). 4 Reduce the amount of steam used for reaction purposes. 5 Monitor the pressures in both reactors. 4 The steam used for loosening and purging the catalyst in the regenerator can also be stopped, depending on the time required to achieve a bed that is not fluidized. In smaller installations, the method of keeping the bed non-fluidized is used after the main air supply is cut off; once the main air supply is restored, the bed can become fluidized again. However, in larger installations, this method is not used – steam must be supplied to keep the bed fluidized when the main air supply is interrupted.