April 2010

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HP Control: Distillation column dual-temperature control—Part 2

Part 1 of this editorial1 has considered a distillation dual temperature control structure and concluded that such strategy is problematic and not likely to work. If you accept that dual-temperature c..

Friedman, Y. Z., Petrocontrol

Part 1 of this editorial1 has considered a distillation dual temperature control structure and concluded that such strategy is problematic and not likely to work. If you accept that dual-temperature control is not the ideal basic structure—how then should we configure DCS for distillation? In my experience, either with heat balance or mass balance, only one of the tray temperature controllers can work. Many considerations affect the selection of rectifying versus stripping tray, and it goes without saying that this temperature controller must ultimately affect the yield and, hence, it isn't desirable to choose a stripping tray temperature for a mass-balance control structure. Say we ha

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