Numerical Modeling of the Wood Pelleting Process
Author
Nielsen, Simon Klinge
Term
4. semester
Education
Publication year
2016
Submitted on
2016-06-09
Pages
121
Abstract
Denne afhandling undersøger, hvordan udformningen af matricen (det metalværktøj med huller, som former træ til piller) påvirker selve pelletteringsprocessen. Arbejdet giver en grundig gennemgang af pellettering og sammenfatter resultater fra tidligere, publicerede studier. Projektet omfatter også forsøg, hvor pelletteringsmaterialet presses ind i en matrice for at forstå, hvordan det pakkes og flyder. For at kunne simulere processen er der opstillet to numeriske modeller: en 1D-model og en 2D-model. Begge bruges til at beregne pelletteringslasten – den kraft, der skal til for at presse materialet gennem matricen – for matricer med forskellige indløbsudformninger. 1D-modellen kan simulere pelletteringslast for matricer uden indløb. 2D-modellen kan udføre simuleringer, der viser de korrekte tendenser i pelletteringslasten, når matricen har et indløb. Samlet set er arbejdet et første skridt mod at kunne simulere pelletteringsprocessen pålideligt.
This thesis examines how the design of the die (the metal tool with holes that shapes wood into pellets) affects the wood pelleting process. It provides a thorough review of the process and summarizes findings from published studies. The project also includes experiments in which the pelleting material is pressed into a die to observe how it compacts and flows. To enable simulation, two numerical models—one 1D and one 2D—are developed to calculate the pelleting load, meaning the force required to press material through the die, for dies with different inlet designs. The 1D model can simulate pelleting loads for dies without an inlet. The 2D model produces simulations that capture the correct trends in pelleting load when an inlet is included. Overall, this work is a first step toward reliable simulation of the pelleting process.
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