Re: FCC Reactor Temperature

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Posted by Don Snowden on November 27, 2002 at 09:14:20:

In Reply to: FCC Reactor Temperature posted by Graeme Taylor on November 19, 2002 at 14:57:47:

Graeme/Bob
I would agree wholeheartedly with all the given comments. I think, as Bob mentioned, it depends on the dynamics of the unit. In most cases, leaving the reactor temperature controller closed at the regulatory level is a good method for full burn units.

I have seen one situation where the full burn unit didn't have great "mixing" of catalyst/air in the regenerator, thus the rx temperature (coke make) had significant effect on the regenerator temperature/dynamics. Thus even though the regulatory controller wasn't too bad (given the long dynamics of the process - 90 minutes to line out on slide valve move), we chose to break the TC due to the difficulty in characterizing the slide valve dp (as you mentioned in your note).

good luck
Don

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Comments:
: Graeme/Bob
: I would agree wholeheartedly with all the given comments.  I think, as Bob mentioned, it depends on the dynamics of the unit.  In most cases, leaving the reactor temperature controller closed at the regulatory level is a good method for full burn units.

: I have seen one situation where the full burn unit didn't have great "mixing" of catalyst/air in the regenerator, thus the rx temperature (coke make) had significant effect on the regenerator temperature/dynamics.  Thus even though the regulatory controller wasn't too bad (given the long dynamics of the process - 90 minutes to line out on slide valve move), we chose to break the TC due to the difficulty in characterizing the slide valve dp (as you mentioned in your note).

: good luck
: Don


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