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08-09-2010 |
Prenez quelques instants pour consulter notre serie de webinaires "THEORY & PRACTICE OF PAPERMAKING". (Cette série de webinaire se déroulera en anglais.)
Cliquer : Programme
Cliquer : Inscription
Joignez-vous à nous et prenez part à ces présentations interactives qui auront lieu sur Internet et par téléphone et qui traiteront de différents éléments du procédé du bout humide dans la fabrication du papier.
Quand : Du 5 octobre au 4 novembre 2010, 10 présentations au total, de 14 à 16 h heure de l'Est
Pour plus d'informations et pour vous inscrire, veuillez communiquer avec Carmie Lato au 514-392-6969 ou rendez-vous sur www.paptac.ca
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Dernière mise à jour : ( 08-09-2010 )
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10-08-2010 |
PaperWeek Canada - La conférence annuelle de l'industrie canadienne des pâtes et papiers, aura lieu du 1er au 3 février 2011 à l'hôtel Fairmont Le Reine Élizabeth à Montréal.
Cliquer : Appel de communications - Programme technique
Un symposium spécial sur le bioraffinage forestier aura également lieu dans le cadre de PaperWeek Canada.
Cliquer : Biorefinery Symposium Call for Communications
De plus amples informations seront disponibles sous peu.
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Dernière mise à jour : ( 16-08-2010 )
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03-08-2010 |
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TO ACCESS FULL PAPERS (member access required):
Once logged-in – Main Menu/Publications and Standards/On-line Docs/Peer-Reviewed Tech. Papers
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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Dernière mise à jour : ( 03-08-2010 )
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