Sensor locations and noise reduction in high-purity batch distillation control loops

AUTOR(ES)

Oisiovici, R.M., Cruz, S.L.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2000-12

RESUMO

The influence of the sensor locations on the composition control of high-purity batch distillation columns has been investigated. Using concepts of the nonlinear control theory, an input-output linearizing controller was implemented to keep the distillate composition constant at a desired value by varying the reflux ratio. An Extended Kalman Filter was developed to estimate the compositions required in the control algorithm using temperature measurements. In the presence of measurement noise, the control performance depended greatly on the sensor locations. Placing the sensors further from the top stages reduced the detrimental effects of noise but increased the inference error. To achieve accurate composition control, both noise reduction and composition estimate accuracy should be considered in the selection of the sensor locations.

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