Catalyst tank small feeding line/large loading/unloading line
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Why is purified air used for fluidizing the small feed lines in the fresh catalyst tank and the hot catalyst tank of the FCC unit, while unpurified air is used for the large feed and discharge lines?
Ours all use unfiltered air, probably to prevent high humidity in the air from carrying moisture. The small diameter of the pipeline makes it easy for the catalyst to get clogged.
There are no special requirements, but the wind needs to be dehydrated.
In our facility, the air humidity is high in summer, which causes severe water contamination in the unfiltered air; this leads to the formation of catalyst sludge inside the small feeding pipelines. Therefore, purified air is selected.
1. Here, physical drying measures are in place at both the outlets of the unfiltered air and the filtered air tanks; of course, drainage is also properly arranged at the bottom as required! 2. Here, both for small and large scale additions, unpurified air is used. Generally, large-scale loading and unloading systems also make use of unpurified air, mainly because of the high volume of material that needs to be transported, as well as the lower cost associated with it!