Regenerated reserve
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This post was last edited by liaifeng on 2018-9-11 11:31. What is the effect of the regenerator inventory on the temperature of the regenerative slurry phase? What is an appropriate level to maintain for the reserve in a regular regenerator?
A large storage capacity is advantageous for temperature control, but other parameters do not allow it; in my opinion, the total storage capacity is around 70 percent
The regenerator has a high inventory, and the catalyst stays in the regenerator for a long time, which facilitates coking; therefore, the dilute-phase temperature of the regenerator should be reduced.
If the regeneration system has a coking tank, then the majority of the coking occurs within that tank. Burnt tanks can maintain a larger storage capacity.
Under the same conditions of charring and main wind flow, if incomplete regeneration occurs and the bed layer is not extremely thin to the point where the main wind penetrates it, the amount of fuel stored has little effect on the temperature difference between the dense and sparse areas. However, when the main wind penetrates the bed layer, combustion occurs in the sparse areas, the temperature difference decreases, and the temperature in those sparse areas rises.
This is how it is understood in normal circumstances, but in actual production, when the amount of recycled material increases, the temperature difference between the dilute and dense phases decreases, and the temperature of the dilute phase rises. I’m not quite sure about this, so I hope for an explanation. Are you in catalytic cracking?
The bed layer is not very thin, so the main airflow will not penetrate it. The reserve volume has a significant impact on the temperature difference between the dilute and dense phases; a reserve volume of around 3 tons can increase this temperature difference from about 4 degrees to over ten degrees.
When the bed layer is not penetrated, once equilibrium is reached, the amount of char remains unchanged, the amount of green coke also remains unchanged; the storage capacity increases, the number of carbon atoms per catalyst decreases, and the temperature difference between the dense and sparse areas becomes smaller. Are you working with MTO?
Burnt coke remains unchanged, unburnt coke remains unchanged – why then does the catalyst residence time have an impact on the temperature of the dilute stream?
You are a theorist; you have never been involved in actual production. This is something that differs during the production process, so it cannot be understood using common sense