The problem of a stuffy bed
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When the regenerator starts to experience bed fouling, the first step is to turn on the non-purified air – is the purpose of this to prevent a large amount of catalyst from entering the auxiliary combustion chamber? The answers to the daily question in the question bank!
It is also necessary to prevent the catalyst from flowing into the fan outlet.
When the bed becomes blocked, it is usually because, after the main air supply system activates its own protection mechanisms, the shutdown valve at the main air outlet closes. I think the use of purge air serves to loosen such blockages, and it is important to maintain the bed temperature as high as possible; if it drops below 400 degrees, it is necessary to carry out agent removal procedures
Is there any way to prevent a large amount of catalyst from being poured into the auxiliary combustion chamber?
The flow going into the fan outlet must first pass through the auxiliary combustion chamber; it can be said that this is a rather extreme situation! I’ve been working in catalysis for over 20 years, and I’ve only encountered it once; moreover, it’s not something that can be resolved by simply stopping the reaction process! Stop the operation first and remove the catalyst. . . . . . .
I’m not quite sure; is it similar to our slow-cooking oven?
What type of main air distribution duct do you have? @wlf1234
Actually, it’s fine to enter the auxiliary combustion chamber. Although there is a catalyst transfer line at the bottom of the auxiliary combustion chamber, it’s hardly used. There is a non-purified air line with a diameter of around DN80 in front of the main air safety valve; if you use that line to blow air, you can direct the catalyst straight to the regenerator (that is, creating a very small passage from the main air safety valve to the regenerator). I’ve experienced this before, so I think it’s okay as long as the air doesn’t flow back into the fan.
The non-purified air is primarily used for loosening purposes, to prevent the catalyst from remaining in a dead state for long periods, which would make fluidization difficult when main air is supplied.
Well, choosing to remove some of the balancing agent helps with fluidization when the main airflow is restored.