Flow initiation in the new catalytic cracking unit – criteria for selecting balance agents
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What is the standard for selecting a balance agent typically? What are the key parameters? The balance agent should be ≤40 microns, not more than 25%; 40–80 microns should account for ≥50%; and >80 microns should account for ≤30%. Are there any requirements regarding heavy metals? If the total content is higher than 5000, what are the influencing factors? Fine powder content > 8%? ? ? Initial fluidization, criteria for catalyst selection.
It mainly depends on the activity of the balanced catalyst, the sieve analysis composition, and the heavy metal content
The Patent Association will require certain indicators, mainly those related to fluidization performance and activity; the points mentioned above cover most of them
The standards you mentioned are more or less sufficient; as long as the heavy metal content isn’t too high, and the amount of fine powder inside isn’t too much, that’s fine
Since it is a balancing agent, it is catalyst discharged from the regenerator; whether from the same plant or from another one, the operation of both units was normal before the discharge, which suggests that the particle size distribution of the regenerating agent is normal – there are usually few fine particles and many coarse ones, so there is no need to worry about fine particles affecting this issue. Before starting work, it is necessary to determine the particle size distribution of the regenerant so as to have a clear understanding of it; currently, there seems to be no absolute standard for this. Pay attention to the heavy metal content; it is likely the heavy metals that pose a problem. As long as their level isn’t too high (for example, above 10,000 ppm), there should be no issues. After the flow in both reactors is normal, if the heavy metal content is high, some fresh catalyst can be added before feeding.