Advanced control system feed forward

An advanced feed-fiirward control system was installed. E adi time a powa-outlet was used in the control room, the feed-forward system was affected just like running an electric appliance interferes with TV recqitian. This caused erratic reflux and rdxnl behavior. 

On one distillation tower (an isobutane—normal butane splitter), an advanced feed-forward control system was installed. The new controls were an instant success. However, after a few days the operators reported that gremlins had entered the new system and were playing malicious tricks. The butane splitter, without any prior notice, would suddenly go completely wild. Both the reboiler steam and reflux rates would change erratically. 

The controller in such a system can be any kind of controller, e.g., a PI, PID, PID with a feed forward term, or any advanced control structure. 

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