diplomsko delo - visokošolski strokovni študij
David Ferjan (Author), Ida Poljanšek (Reviewer), Dominika Gornik Bučar (Mentor), Bojan Gospodarič (Co-mentor)

Abstract

V proizvodnji lesnih peletov se kot vhodna surovina pogosto uporablja vlažna žagovina. Za izdelavo peletov je žagovino potrebno osušiti, za kar se pogosto uporabljajo sušilniki s sušilnim bobnom, v katerem se žagovina suši s pomočjo dimnih plinov. Pri temperaturi sušenja žagovine nad 250 °C se pri peletiranju pojavijo težave. Predvidevamo, da visoke temperature sušenja vplivajo na vezivne lastnosti surovine, predvsem na količino lignina, ki v peletih deluje kot vezivo. V nalogi smo ugotavljali vsebnost lignina v žagovini, ki smo jo sušili z dimnimi plini pri temperaturah 200 °C, 230 °C, 375 °C, 400 °C, 420 °C in 440 °C. Spremembo količine lignina v žagovini smo preverjali po dveh metodah, z delignifikacijo in z določanjem vsebnosti lignina po Klasonu. Opravljene analize žagovine za izdelavo peletov niso pokazale odvisnosti vsebnosti lignina od povišane temperature sušenja surovine z dimnimi plini. Ugotavljamo, da so potrebne dodatne analize, ki bi dale odgovor na to, katera komponenta in v kolikšni meri se spremeni ob povišani temperaturi sušenja, da se to rezultira v obliki slabše vezivnosti surovine za izdelavo peletov.

Keywords

lesni peleti;izdelava peletov;sušenje žagovine;temperatura sušenja;lignin;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [D. Ferjan]
UDC: 691.115
COBISS: 2662025 Link will open in a new window
Views: 386
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Other data

Secondary language: English
Secondary title: Influence of drying temperature on adhesive properties of wood pellets
Secondary abstract: In the production of pellets made of wood, often wet saw dust is used as entrance material. For pellet production this saw dust must be dried, often drum driers used for drying, using exhaust gases as a heating media. At temperatures above 250 °C some problems in pellet production appear. We assume that higher temperatures influence the chemical structure of material, mostly of lignin. We examined lignin content in saw dust that was dried by exhaust gases at temperatures 200 °C, 230 °C, 375 °C, 400 °C, 420 °C and 440 °C. We were using two methods do establish the difference in lignin content, delignification and lignin content method by Klason. Analysis performed did not present a connection between lignin content and higher temperature used for drying of the entrance material with exhaust gases. We establish that aditional analysis and studies would be necessary to have an answer which componenet and in which extent is changed at higher temperature to result as a decrease of adhesive properties of the pellet material.
Secondary keywords: pellets;wood pellets;heating with pellets;saw-dust drying;lignin;temperature influence;
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: IX, 47 f.
ID: 11928318