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Energianvändning vid pelletering: En undersökning av strömningsenergins betydelse för den totala energianvändningen vid pelletering
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
2019 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Energy requirements during the pelletizing process : A study of the importance of the flow component for the total energy requirement during pelletizing (English)
Abstract [sv]

Biobränslen utgör 25% av Sveriges energitillförsel och majoriteten av dessa är träbaserade. Träpellets är ett biobränsle och i Sverige producerades 1,6 miljoner ton pellets 2018. Egenskaper hos pellets så som hållbarhet och energiåtgång för produktion testas ofta i en singelpelletspress. Då den totala energianvändningen för att pressa en pellet i en industriskalig matris innefattar tre energikrävande delmoment; komprimering, friktion och strömning. Strömning är då material som ligger över ytorna mellan presskanalerna, klacken, komprimeras och flytts ner mot konorna, samt då materialet som befinner sig i en kona deformeras när det trycks ner i presskanalen.

Pelletering i en konventionell singelpelletspress innefattar enbart komprimering och friktion. Denna studie har fokuserat på att undersöka strömningsmomentets inverkan på den totala energianvändningen. För att undersöka detta har komprimeringsenergi, friktionsenergi, strömningsenergi samt den kraft som krävs för att strömningsmomentet ska påbörjas, Fflow, undersökts för 3 olika partikelstorlekar.

Färsk gran med en fukthalt på 10% har pressats i olika matriser. Detta för att bestämma strömningens inverkan på den totala energianvändningen samt hur stor inverkan pressning av material som befinner sig runt inströmningskonan, på klacken, till presskanalen har på den totala energianvändningen.

Partikelstorleken påverkar inte energianvändningen. Fflow var högre för tester i matris med klack jämfört med tester i matris utan klack. Detta ledde till att även komprimeringsenergin ökade. Materialet kring konöppningen påverkade pressningen så att den producerade pelleten blev 1 mm kortare, vilket gav en lägre friktionsenergi för dessa tester. Strömningsenergin stod för 43–57% av den totala energianvändningen. Energin som krävdes för den delen av strömningen där material runt inströmningskonan pressas stod för 35–52% av den totala energianvändningen.

Abstract [en]

Biofuels make up 25% of Sweden’s energy supply and the majority of biofuels used are made from wood. Wood pellets is one type of biofuel and in Sweden, 1.6 million tonnes of wood pellets were produced in 2018. Different pellet properties such as durability and energy use for production is often tested in a single pellet press. The total energy use for making a pellet in an industrial scale machine is the sum of the energy required for three different component sequences, compression, friction and flow. Flow is when the material that lies on the surfaces between the press channel openings is compressed and pushed downwards towards the coned openings and the materiel in the coned opening is deformed and pushed down to the press channel.

Only compression and friction can be studied using a conventional single pellet press. Thus, this study focuses on the impact of the flow component on the total energy use for pelletizing. In order to do this, energy used for compression, friction and flow, as well as the power required for the material to enter the flow component, Fflow, has been studied for three different particle sizes.

Fresh spruce with a moisture content of 10% has been pressed in different dies. With these pressings, the impact of the flow component, as well as the impact of pressing material located around the coned press channel opening on the total energy use was determined.

Particle size did not affect energy use. Fflow was higher for pressings with material located on the surface around the coned opening, compared to pressings without. This resulted in an increased compression energy for pressings with material around the coned opening. The material located around the press channel opening affected the pelletizing so that the produced pellet was 1 mm shorter, which resulted in a lower energy use for the friction component. Energy used by the flow component made up over 43-57% of the total energy use. The part of the flow energy that is needed to compress the material around the press channel opening and move that material towards the opening stood for 35-52% of the total energy use for palletization.

Place, publisher, year, edition, pages
2019. , p. 24
Keywords [sv]
pellets, strömningsenergi, partikelstorlek
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-76144OAI: oai:DiVA.org:kau-76144DiVA, id: diva2:1383636
Subject / course
Environmental and Energy Systems
Educational program
Bachelor of Science in Enviromental and Energy Engineering, 180 hp
Supervisors
Examiners
Available from: 2020-04-15 Created: 2020-01-08 Last updated: 2020-04-15Bibliographically approved

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