Feedforward Control of Multistage Gas-liquid Reactor with Recycles

Abstract

The present work intended to synthesize theoretically the effective feedforward control systems for a multistage gas-liquid reactor with recycles.
Based on a linear mathematical model it was found that the control system of which detected variables were selected so as to compensate any predicted disturbance, for example any change in gas feed concentration, eliminated unpredicted disturbances such as changes in concentrations on any stage below the detected stage. Furthermore, it was shown that without a full identification of the dynamics, the controller for the effective control system could be designed from the elemental transfer functions describing the dynamic behaviour of a controlled stage. Finally, it was drawn that as a manipulative variable a recyclic flow rate was preferable to feed flow rate conventionally employed.
Also these theoretical findings were ascertained by analogue computer simulations.