Start-up of catalytic fractionation
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When starting up the fractionation system of a catalytic cracking unit, is it possible to set up the middle section system or the top circulation system in advance? Are there any experts in this area? Exchange ideas?
Can an early cycle be established?
There is no such thing as early or late; when distillation starts, one has to wait continuously for the reaction to proceed. After waiting for the flow in the three catalyst reactors to return to normal, the catalyst is sent to the regenerator, and then the large blind flanges begin to be removed. At this point, it is necessary to maintain the level and circulation rate of the slurry, especially the amount flowing into the upward counter-current tower. At this point, fractional distillation involves an external circulation within the tower; there is no top circulation, and the middle section is established in advance, which is not allowed. Wait for the large blind plate, modify the tower interior, establish various cycles, make adjustments, etc
I’m just a beginner; please point out any mistakes I make
Regarding this issue, you need to understand what the prerequisites are for establishing reflux in a distillation tower A gradually rising gas phase and a gradually falling liquid phase are necessary to ensure the establishment of reflux in each section. If there is only a falling liquid phase without a rising gas phase, the light components will push downward, which can cause many problems in the operation of the distillation tower, both in terms of product quality and production processes! Since you are a newcomer, it is recommended to solidify some of the relevant theoretical knowledge before proceeding with further research; otherwise, many issues will become increasingly unclear and it will be harder to know what direction to take.
In my setup, diesel is filled into the middle section of the pipeline in advance, while gasoline is filled into the top circulation pipeline; this allows for the feeding of reactants. Once the temperature of the tower rises, the pumps in the middle section and the top circulation section can reach their operating capacity more quickly and start functioning properly.
It mainly depends on whether the components have been established