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Gray-box identification of dynamic models for the bleaching operation in a pulp mill |
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| Authors: | Harigopal Raghavan R. Bhushan Gopaluni Sirish Shah Johan Pakpahan Rohit Patwardhan Chris Robson |
| Affiliation: | aDepartment of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6;bMatrikon Inc., Edmonton, Alberta, Canada T5J 3N4;cMillar Western Forest Products, Whitecourt, Alberta, Canada T7S 1N9 |
| Abstract: | The development and application of gray-box identification techniques for modelling the bleaching operation in a Bleached Chemi-Thermo Mechanical Pulp (BCTMP) mill are explained. The process is characterized as a delay dominant recycle process with significant input nonlinearities. The identification was carried out using routine operating data in which the outputs were measured irregularly. The effects of these characteristics and consequent modifications of the system identification techniques are discussed. The resulting models are being used for online prediction and model-based controller design at the mill with satisfactory performance. |
| Keywords: | Gray-box identification Recycle processes Irregular sampling Input nonlinearities Routine operating data Bleached chemi-thermo-mechanical pulp mill Expectation maximization Constrained identification |
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