PaperWeek Canada - The Annual Conference of the Canadian Pulp and Paper Industry, will take place February 1-3, 2011 at the Fairmont Queen Elizabeth Hotel in Montreal (Québec) Canada.
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INTRODUCING A NEW DECISION TOOL USING MPC FOR THE PRODUCTION LINE EVOLUTION
The decision tool presented in this paper links management decisions to production optimization. It identifies the possible lacks of flexibility (physical limitations) and/or agility (unsuitable dynamics) of either product, process or production parameters (PPP) in a production environment that is under the influence of some global turbulence factors and for which profitability objectives have to be maintained. If need be, a particular evolution scenario could be proposed to maintain strategic level targets. In this context, flexibility and agility act as performance measures and quantitative definitions using DCS (Distributed Control System) data are proposed in the paper. A description of the strategy’s implementation, which uses Model Predictive Control (MPC), and some results are presented.
ON-LINE DETERMINATION OF GREEN-LIQUOR REDUCTION EFFICIENCY AND TOTAL TITRATABLE ALKALI USING FOURIER-TRANSFORM-NIR SPECTROMETRY
In this paper, we describe the use of Fourier-transform Near-Infrared spectrometry (FT-NIR) for on-line measurement of green liquor compositions, such as TTA, EA, carbonate, sulphide, sulphate, thiosulphate, and reduction efficiency (RE) in raw green liquor. The technical feasibility of using this analyzer as an on-line monitoring system for dissolving tank TTA control as well as for reduction efficiency monitoring has been demonstrated during normal mill operation as well as for simulated upset conditions. FT-NIR data for TTA has tracked well with dissolver density values. In addition, FT-NIR reduction-efficiency data has been correlated to changes in black-liquor solids content, primary air flow and black-liquor firing rate. Online TTA control could help stabilize TTA which will stabilize recaust operations. The ability to monitor reduction efficiency online will provide operators with better understanding of boiler conditions that lead to “poor” conditions with high TRS and dead-load.
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