Material Balance

Posted by Graeme Taylor on April 07, 19102 at 12:42:34:

I am currently being asked by my operations group to reduce the variability in LPG flow rate from our FCC gas plant’s de-butaniser, due to downstream equipment problems. The tower is configured with an energy balance control scheme but has anyone tried implementing a material balance control scheme on an equivalent tower? If so, how well did it work?

The tower’s pressure control is via a hot gas bypass and I was thinking of simply setting the LPG flow out of the distillate drum in Auto, controlling the level with the reflux and building a duty controller for the reboiler. The reflux to distillate ratio is about 2.5. Ultimately I would build a DMC controller, which would manipulate the distillate flow (slowly) to handle the quality control issues.

Follow Ups:

• Re: Material Balance Nahum Lifshitz 08:28:19 4/08/102 (1)
  • Re: Material Balance Graeme Taylor 14:24:34 4/08/102 (0)

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: I am currently being asked by my operations group to reduce the variability in LPG flow rate from our FCC gas plant’s de-butaniser, due to downstream equipment problems.  The tower is configured with an energy balance control scheme but has anyone tried implementing a material balance control scheme on an equivalent tower?  If so, how well did it work?  

: The tower’s pressure control is via a hot gas bypass and I was thinking of simply setting the LPG flow out of the distillate drum in Auto, controlling the level with the reflux and building a duty controller for the reboiler.  The reflux to distillate ratio is about 2.5.  Ultimately I would build a DMC controller, which would manipulate the distillate flow (slowly) to handle the quality control issues.


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