Control of regenerator inventory
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What is the basis for setting the upper limit on regenerator inventory control?
I believe that an excessive amount of catalyst leads to poor fluidization of the catalyst; the main airflow is not sufficient to support it, it is difficult to control the amount of catalyst present, and the catalyst stays in place for too long, which results in increased wear
This post was last edited by Refiner on 2016-12-15 at 15:13. There are advantages and disadvantages on both sides. To start with the negative aspects: the first main fan is definitely limited； The wear index increases with a longer second residence time ； There are limitations on the transfer of the third catalyst from the self-sedimentator to the regenerator, and the fourth advantage is that a longer residence time of the catalyst results in better coking effects. To put it more simply: first, a short residence time results in poor charring; second, it’s not possible to seal the material legs, which leads to catalyst leakage ； The reserves of the third system are difficult to control ； Fourth, it is easy for the two devices to interfere with each other. There are other factors affecting it as well.
It doesn’t make any sense to have it too high. We rely on empirical values to maintain a minimum stock level; when the stock exceeds this level by 50 tons, then the material needs to be unloaded
If the dense phase bed is too high, it can easily lead to a high density in the dilute phase, resulting in afterburning!
The upper limit for the regenerator inventory is determined, on the one hand, by the safe operation of the main fan – it cannot be forced to operate under high pressure at the outlet – and on the other hand, an excessively high inventory results in poor burning efficiency of the regenerator as well as a low linear velocity, which affects the fluidization of the catalyst.