Preučevanje fizikalnih, mehanskih in sušilnih karakteristik ksilita

diplomsko delo (univerzitetni študij)

Luka Pollak (Author), Katarina Čufar (Reviewer), Željko Gorišek (Mentor)

Abstract

Kalorične lastnosti ksilita, litotipa lignita, so dobro raziskane, saj se pretežno uporablja kot gorivo. Natančnejše poznavanje njegove anatomske zgradbe ter fizikalnih in mehanskih lastnosti bi omogočilo izdelavo tudi uporabnejših izdelkov. Z mikroskopsko karakterizacijo zgradbe ksilita in proučevanjem osnovnih sorpcijskih in krčitvenih lastnosti smo določili sušilne parametre ter jih preverili v laboratorijskih pogojih. Gostota ksilita (ro=1229 kg/m3) je primerljiva z najgostejšimi listavci; to povzroča močno krčenje. Na veliko nestabilnost kažejo tudi neugodno diferencialno nabrekanje, koeficient nabrekanja in sorpcijski kvocient. Sušilna krivulja izkazuje zelo kratek linearni odsek in velik difuzijski upor v 2. in 3. fazi sušenja. Zaradi različnih vključkov, deorientiranosti tkiva in velikih sušilnih napetosti je kohezivnost tkiva slaba, kar zmanjšuje kakovost in izkoristek osušenega ksilita.

Keywords

ksilit;lignit;anatomske lastnosti;fizikalne lastnosti;mehanske lastnosti;sušilne lastnosti;krčitvene lastnosti;

Data

Language:	Slovenian
Year of publishing:	2007
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[L. Pollak]
UDC:	662.642.1
COBISS:	1489801
Views:	1328
Downloads:	405
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Research of physical, mechanical and drying properties of xylite
Secondary abstract:	Calorific properties of xylite, litotype of lignite, are well researched, because it is used mainly as a fuel. If we knew the anatomical structure, physical and mechanical properties better, it would allow us to expand the use of xylite to some other areas. Using microscopic characterization drying parameters were defined and verified in laboratory conditions. Density of xylite (ro=1229 kg/m3) is comparable with highest densities of hardwoods. As a result xylite has high shrinking rate, differential shrinkage, shrinking and sorption coefficient. Drying curve has very short linear part and great diffusion resistance in 2nd and 3rd phase of drying. Poor cohesion of xylite tissues, caused by mineral inserts and deorientation of tissues, and great drying tensions are responsible for low efficiency of drying process.
Secondary keywords:	xylite;lignite;anatomic properties;physical properties;mechanical properties;drying properties;shrinking properties;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	XIII, 68 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;chemical technology;chemical and related industries;kemijska tehnologija;kemijske in sorodne industrije;explosives;fuels;eksplozivi;goriva;heat or fuel economy in general;combustion;natural fuels;toplotno gospodarstvo na splošno;gorenje;naravna goriva;
ID:	21081