Catalytic endothermal heat extraction comes in two forms: heat extraction within the regenerator and heat extraction from the outside
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What are the advantages of extracting heat from outside rather than from the regenerator?
I have only seen simple internal heat extraction coils. In my opinion, external heat extraction allows for better control of the amount of heat extracted by regulating the catalyst circulation rate, which makes it more flexible; but how can internal heat extraction be controlled? It can’t possibly be controlled through the main air flow and regeneration temperature, right?
When heat is extracted externally, it’s easy to identify and address issues with the heat extraction tubes, and it’s also convenient to adjust the amount of heat extracted.
With a different format, heat can still be extracted from within
Heat removal from the regenerator is divided into external heat removal and internal heat removal. Internal heat removal involves taking heat from within the two-phase region, and it represents a fixed amount of heat removed. External heat removal occurs when the catalyst passes through the two-phase region to the coking tank where heat is removed. The advantage of external heat removal is that adjustments can be made according to the requirements of the reaction, thereby meeting the process needs.
Heat extraction from within is energy-saving, while heat extraction from outside is energy-consuming.
Thank you. But what I meant is only internal heat extraction. Internal heat extraction can take place in the regenerator, or it can be done in an external heat exchanger.
Some are inside the external heat exchanger; so what’s the difference between that and external heat extraction? So there are two steam drums?