ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
A nearly optimal on-off control strategy, previously applied to a rectification column, has been successfully implemented on a full distillation column. The controller employs a linear combination of temperature measurements to adjust the reflux flow rate in order to maintain a desired overhead product composition. A simple relationship between the control coefficients is shown to be characteristic of countercurrent systems. This relationship allows the controller to be tuned on-line by the adjustment of a single parameter, thereby eliminating the need for a dynamic model of the process and for lengthy design calculations.The performance of the tuned on-off controller is compared with that of a tuned proportional plus integral controller and a single measuremnt on-off controller for feed flow disturbances and set point changes. Results show that the multi-measurement on-off control system is superior for both types of disturbances.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690180413
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