Le séchage du bois est une étape critique du procédé de sciage. Un bon contrôle du procédé permet de maintenir une bonne qualité des produits, tout en assurant une bonne productivité et une consommation énergétique optimale, afin de garder les frais d’exploitation au minimum.
Pour faciliter le travail des opérateurs de séchoir et des contremaîtres, ce contrôle peut s’accompagner d’un outil de simulation et d’optimisation du séchage. Celui-ci doit être flexible et prendre plusieurs paramètres en compte pour permettre la simulation de multiples situations. Outre l’optimisation du procédé, il permettrait de réduire la courbe d’apprentissage de nouveaux opérateurs, surtout dans un marché où la rétention de main-d’œuvre est difficile. Il serait aussi un outil idéal pour accélérer la numérisation de l’industrie.
Optitek est un logiciel de simulation de scierie (première et deuxième transformation).
L'objectif du project dans l'initiative SM2:
Développement d'un plateforme d'analyse agile et flexible (architecture modulaire pour faciliter les expansions futures) ; Remplacer les outils disponibles, répondre aux besoins non couverts par les outils existants: En proposant une nouvelle fondation pour redéployer les outils actuels (p. ex., Optitek) ; En modélisant des caractéristiques internes et externes de la fibre ; En analysant des produits issus de la première et seconde transformation ; En analysant de capacité des équipements ; En adressant des analyses de plus en plus complexes
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Several models reference drying processes in a Qubec context, but none is able to adequately predict the characteristics of an entire drying batch leaving a typical industrial kiln
Objectives of the project within the SM2 Initiative: Reduce the learning curve for new kiln operators ; Remote diagnostic tool using a module to connect to the plant ; Improve basic drying prediction models ; Impartial optimization tool for the overall process
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List of figures
Figure 1. A simplified example of information flow in a DSS simulation
FPInnovations Forestry group has developed a variety of computer-based systems or tools to aid forestry practitioners with decision making in harvest operations. These information systems, aptly called Decision Support Systems (DSS), allow the simulation of operational decisions using software applications. With these simulations, the outcomes of operational decisions can be promptly forecasted. DSSs thus allow users to compare the feasibility and economic value of different potential operational decisions.
FPInnovations prepared this guide to provide forest and
resource workers with information on maintaining and monitoring streambed simulation in closed-bottom structures for fish streams. This pamphlet is the fourth in a series. FPInnovations worked in close co-operation with British Columbia's Fish Passage Technical Working Group in the development of this guide.
FPInnovations prepared this guide to provide forest and
resource workers with information on culvert installations,
including fish salvage and dewatering considerations for
streambed simulation in closed-bottom structures for
fish streams. This pamphlet is the second in a series; other
important considerations presented in this series for the
successful implementation of a streambed simulation culvert
include planning and design, streambed material/construction,
and monitoring. FPInnovations worked in close co-operation with British Columbia’s Fish Passage Technical Working Group in the development of this guide.
FPInnovations prepared this guide to provide forest and resource workers with information on streambed construction, including material delivery and rewatering considerations for streambed simulation in closed-bottom structures for fish streams. This pamphlet is the third in a series; other important considerations presented in this series for the successful implementation of a streambed simulation culvert include planning and design, culvert installation, and monitoring.
FPInnovations worked in close co-operation with British
Columbia’s Fish Passage Technical Working Group in the
development of this guide.
Continuous drying is still in its relatively early stages and mills are currently dealing with process adjustments to obtain desired throughput and quality of the final product. Field measurement carried out in 2015-16 illustrated a number of opportunities for process optimization involving each of the three main stages of current continuous kilns. Simulations of industrial continuous drying at laboratory level performed in 2016-17 were successful and allowed the evaluation of each of the drying stages to be fully characterized (lumber temperatures, drying schedule conditions of dry and wet bulb temperatures). Thus, different drying schedules provided an excellent opportunity to examine the impact of schedule conditions on drying defects, drying rates and kiln residence times.
The main objectives of the project for 2017-18 were to simulate continuous drying in laboratory conditions for different products, products mix, species and green sort groups. In addition, a detailed evaluation of potential technologies was carried out to explore the concept of dynamically adjusting speed (push rates), based on drying rates and moisture content.
Piecewise regression was used to identify the optimum push rate and suggest design modifications of continuous kilns. This method proved to be efficient in identifying potential reductions in drying time for different sorts of sprue/pine (SP) lumber without compromising the quality of the final product. Simulations also allowed identifying the push rate of 2 feet/h to satisfactorily dry green hem-fir 2-inch lumber.
Initial tests showed that mid-sort sub-alpine (moisture content below approximately 70%) could not be mixed with wet sort SP in a continuous kiln operating at push rate of 4.2 feet/hr because only 73% of the sub-alpine sort dried below 21%. Decreases in push rate will reduce the percentage of sub-alpine fir wets but will also increase the amount of over-dried lumber. Changes in kiln configuration may reduce the drying time but increase the percentage of over-dried lumber.
The results indicated that additional laboratory tests are required to develop drying schedules and temperature profiles in the main drying zone of continuous kilns, drying times and final moisture content distribution.
RoboCUT is much more than a word game to attract attention. It is a decision support tool that makes sense when the time comes to prescribe a partial cut. Developed by the Canadian Wood (CWFC), it allows you to test different cutting rules before implementing them and to choose the one that will give the best results.
Abstract
RoboCUT c’est beaucoup plus qu’un jeu de mots pour attirer l’attention. Il s’agit d’un outil d’aide à la décision qui prend tout son sens quand vient le temps de prescrire une coupe partielle. Développé par le Centre canadien sur la fibre de bois (CCFB), il permet de tester différentes règles de coupe avant leur mise en œuvre et de choisir celle qui donnera les résultats souhaités
FPInnovations prepared this guide to provide forest and resource workers with information on the planning and design considerations for streambed simulation in closed-bottom structures for fish streams. Other important considerations that are key to the successful implementation of a streambed simulation culvert include structure installation, streambed material, and monitoring. These subjects will be covered in future guides.
FPInnovations worked in close co-operation with British Columbia’s Fish Passage Technical Working Group in the development of this guide.
