Obravnava kinetike in mehanizma reakcije pirolize smrekovega lesa : magistrsko delo

Mihelič, Erik

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Title:	Obravnava kinetike in mehanizma reakcije pirolize smrekovega lesa : magistrsko delo
Authors:	ID Mihelič, Erik (Author) ID Klinar, Dušan (Mentor) More about this mentor... ID Goršek, Andreja (Comentor)
Files:	MAG_Mihelic_Erik_2022.pdf (5,43 MB) MD5: 58DC6E7B175150A47254212CF123CF23
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	Biooglje (BO) se vse bolj uveljavlja kot dodatek k zemlji za izboljšanje njenih lastnosti in kot metoda direktne trajne vezave ogljika. BO deluje kot inertni material z ustrezno specifično površino in drugimi koristnimi lastnostmi pri izboljševanju strukture in lastnosti rodovitnih tal. Ker je proizvodnja BO tesno povezana s postopkom pirolize lesne biomase, smo se v magistrski nalogi osredotočili na raziskavo kinetike ter mehanizma pirolize, za lesno biomaso pa smo izbrali smrekov les v obliki preizkušancev konstantnih dimenzij. Prvi namen raziskav je bil ugotoviti ustrezen kinetični model, ki bo najbolje popisal eksperimentalne podatke, poiskati kinetične parametre ter oboje primerjati z rezultati, analiziranimi preko že obstoječih kinetičnih pristopov kot so: Arrhenius-ov model (AM), Friedmanova metoda, Ozawa-Flynn-Wall (OFW) metoda in Kissinger-Akahira-Sunose (KAS) metoda. Eksperimentalne podatke termo gravimetrične analize (TGA) smrekovega vzorca smo analizirali s pomočjo programskega okolja Python in raziskali alternativni kinetični pristop, katerega smo poimenovali modificiran Arrhenius-ov model (MAM). Prednost MAM je v tem, da vključuje mehanizme glavnih lesnih komponent, hemiceluloze, celuloze in lignina, medtem ko vsi ostali modeli reakcijo pirolize obravnavajo enodimenzionalno. Naslednji namen magistrske naloge je bil popisati termodifuzijske fenomene s področja nestacionarnega prenosa toplote in z vrednostjo Biot-ovega števila dokazati, da debelina lesnega valja ne vpliva na potek pirolizne reakcije, kar pomeni da je notranji toplotni upor zanemarljiv. Na koncu smo pirolizo smrekovih valjev (debeline 5 mm) izvedli še v večjem laboratorijskem piroliznem reaktorju (volumna 1 L) in rezultate primerjali z rezultati TGA. Takšen pristop omogoča spoznavanje povečevalnih kriterijev pri inženirski obravnavi načrtovanja industrijskih piroliznih reaktorjev.
Keywords:	piroliza, smrekov les, kinetika, mehanizem, Python, prenos toplote
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[E. Mihelič]
Year of publishing:	2022
Number of pages:	1 spletni vir (1 datoteka PDF (XIII, 80 f.))
PID:	20.500.12556/DKUM-83155
UDC:	66.092-97:674.032.475.5(043.2)
COBISS.SI-ID:	132666371
Publication date in DKUM:	05.10.2022
Views:	780
Downloads:	95
Metadata:
Categories:	KTFMB - FKKT
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Licences

License:	CC BY 4.0, Creative Commons Attribution 4.0 International

Link:	http://creativecommons.org/licenses/by/4.0/
Description:	This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:	22.09.2022

Secondary language

Language:	English
Title:	Study of kinetics and reaction mechanism of spruce wood particles pyrolysis
Abstract:	Biochar is gaining ground as an additive to soil to improve its properties and as a direct permanent carbon sequestration method. Biochar acts as an inert material with adequate specific surface area and other beneficial properties in improving the structure and properties of fertile soils. Since the production of biochar is closely related to the process of pyrolysis of wood biomass, in this thesis, we focused on the research of the kinetics and mechanism of pyrolysis, and we chose spruce wood as the wood biomass. The first purpose is to determine the appropriate kinetic model that best describes the experimental data, finds the kinetic parameters and compare both with the results analyzed through already existing kinetic approaches such as the Arrhenius model (AM), Friedman method, Ozawa-Flynn-Wall (OFW), method and the Kissinger-Akahira-Sunose (KAS) method. The experimental data of the spruce examples thermogravimetric analysis (TGA) were analyzed using the Python programming environment and an alternative kinetic approach, which we called the modified Arrhenius model (MAM). The advantage of MAM is that it includes the mechanisms of the primary wood components, hemicellulose, cellulose, and lignin, while all other models treat the pyrolysis reaction one-dimensionally. The following purpose of the master's thesis is to describe thermodiffusion phenomena in the field of non-stationary heat transfer and to prove with the value of the Biot number that the thickness of the wooden cylinder does not affect the course of the pyrolysis reaction, which means that the internal thermal resistance is negligible. Finally, the pyrolysis of spruce cylinders (thickness 5 mm) was carried out in a larger laboratory pyrolysis reactor (volume 1 L), and the results were compared with the TGA analysis. Such an approach would enable the knowledge of increasing criteria in the engineering consideration of the design of industrial pyrolysis reactors.
Keywords:	pyrolysis, spruce wood, kinetics, mechanism, Python, heat transfer

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