FCC Reactor Temperature

Posted by Graeme Taylor on November 19, 2002 at 14:57:47:

What are people’s thoughts as to including the reactor temperature in an FCC DMC controller as an MV, rather than as a CV?

Historically we have had very good control of the reactor temperature using a simple PI controller, to the reactor slide valve. The loop is relatively fast, similar dynamics to a furnace COT, and copes well with disturbances in feed rate and feed temperature. I believe that if the unit is partial burn there are concerns about the regenerator temperature becoming a ramp variable, but in our full burn unit I don’t think that this is the case. I do anticipate slide valve delta pressure being a constraint reasonably frequently, would this be enough of a reason to break the loop and include the slide valve as the MV and reactor temperature as a CV, in our proposed FCC DMC?

Any thoughts/experiences would be gratefully received.

Follow Ups:

• Re: FCC Reactor Temperature Don Snowden 09:14:20 11/27/02 (0)
• Re: FCC Reactor Temperature Bob Ellis 14:19:07 11/20/02 (0)

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Comments:
: What are people’s thoughts as to including the reactor temperature in an FCC DMC controller as an MV, rather than as a CV?  

: Historically we have had very good control of the reactor temperature using a simple PI controller, to the reactor slide valve.  The loop is relatively fast, similar dynamics to a furnace COT, and copes well with disturbances in feed rate and feed temperature.  I believe that if the unit is partial burn there are concerns about the regenerator temperature becoming a ramp variable, but in our full burn unit I don’t think that this is the case.  I do anticipate slide valve delta pressure being a constraint reasonably frequently, would this be enough of a reason to break the loop and include the slide valve as the MV and reactor temperature as a CV, in our proposed FCC DMC?

: Any thoughts/experiences would be gratefully received.


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