Effect of injecting combustion oil into the catalytic regenerator
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In heavy oil catalytic cracking, burning oil is injected to maintain operations during startup/shutdown and normal production fluctuations. What impact does injecting burning oil into the regenerator have on the catalyst? (Could the number of fuel combustion nozzles be increased to reduce the impact of fuel combustion on the catalyst?) I hope for guidance from all the experts; thank you!
Since the amount injected is not large to begin with, in most cases, a pair of nozzles in a symmetric arrangement is sufficient! It definitely has an impact on the catalyst, but I think as long as it’s controlled properly, there shouldn’t be any problems!
The regenerator only sprays combustion oil when there is insufficient heat, so it will not be affected in the short term.
Nozzles are generally arranged symmetrically; they open symmetrically during fuel injection to ensure the right amount of fuel is used and to remove excess water
This is mainly due to the excessively high local temperature near the fuel combustion nozzle, which can easily cause the catalyst to crack. This leads to increased catalyst damage.
A few days after the unit started operating, the dilute-phase density remained quite high; it gradually decreased after the use of a displacing agent. Was burning oil sprayed at the time of startup?
What are the main effects of injecting combustion oil on the catalyst?
This is related to your operations; it’s not necessarily caused by spraying fuel oil!
It still has a certain impact; if the amount is too large and there is water present, it can easily lead to wear and loss of the catalyst
The key point is that when spraying combustion oil, misting steam is also required, and this has an impact on the catalyst as well.