Modelling of cement grinding circuits for predictive control
| Authors: | Huusom Jakob Kjøbsted, Technical University of Denmark, Denmark
Jensen Anker Degn, Technical University of Denmark, Denmark
Jørgensen Sten Bay, Technical University of Denmark, Denmark
Michelsen Michael, Technical University of Denmark, Denmark
Knudsen Jørgen, FLS-Automation A/S, Denmark
Recke Bodil, FLS-Automation A/S, Denmark
Jørgensen John Bagterp, 2-control Aps, Denmark |
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| Topic: | 1.1 Modelling, Identification & Signal Processing |
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| Session: | Modeling of Physical Systems |
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| Keywords: | Modeling, nonlinear systems, comminution, grinding circuit, cement industry |
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Abstract
A first principles model of a cement grinding circuit is developedfor the purpose of multi-variable model predictive control (MPC).The model is based on a series of mixed flow reactors with anideal screen to model flow between the two chambers in the ballmill. The separator is modelled by efficiency curves. Breakage ofthe particles is modelled as a first order process in terms offunctions for the specific rate of breakage and the fragmentdistribution from breakage. These breakage functions areempirically based. A stationary solution for the model is foundand dynamic simulations of step changes in the manipulatedvariables are shown.
