Određivanje sastava pepela biomase drvne sječke

master's thesis

• Title (english): Determination of biomass wood chips ash composition
• Author: Kristina Bezina
• Mentor: Danijela Ašperger (mentor)
• Committee member: Danijela Ašperger (predsjednik povjerenstva)
• Committee member: Mirjana Novak Stankov (član povjerenstva)
• Committee member: Dragana Vuk (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Analytic Chemistry

Abstract

Čvrsta biogoriva kao obnovljivi izvor energije su danas sve više u upotrebi kao gorivo u bio elektranama. Tijekom njihovog izgaranja nastaje pepeo koji je potrebno dalje koristiti kao sirovinu ili zbrinjavati na odlagališta, pri čemu je sastav pepela jako bitan jer sadržaj pojedinih oksida znatno utječe na moguće daljnje korištenje pepela. Određivanje sastava pepela obuhvaća određivanje sadržaja oksida: Na2O, K2O, CaO, MgO, Al2O3, Fe2O3 i SiO2. Za njihovo određivanje najčešće se koristi EDXRF spektrometar kao odlična analitička tehnika za brzo i precizno određivanje velikog broja elemenata u kompleksnim maticama uzoraka. Problem prilikom razvoja EDXRF metoda za analizu sastava pepela biomase je potrebno osigurati dovoljan broj referentnih materijala za izradu metode. Kako do sada na tržištu ne postoje referentni materijali pepela biomase, jedan od načina je određivanje sastava pepela drugom analitičkom tehnikom (ICP-OES) te primjena tih rezultata kao referentnih vrijednosti za razvoj metode na EDXRF spektrometru. Eksperimentalni rad je uključivao raščinjavanje ili digestiju pepela biomase potpomognutom mikrovalovima te određivanje sadržaja glavnih elemenata na ICP-OES-u. Metoda određivanja je provjerena certificiranim referentnim materijalom NIST SRM 2690 Coal Fly ash. Na osnovu dobivenih rezultata isti uzorci pepela se koriste za umjeravanje metode određivanja sastava pepela na EDXRF-u. Nakon razvoja metode provedena je validacija metode. Metoda određivanja sastava pepela potom je primijenjena na realnim uzorcima pepela iz bio elektrana.

Abstract (english)

Solid fuels as a renewable source of energy are now increasingly in use as fuel in bio plants. During their combustion, ash is produced which needs to be further used as raw material or disposed of at landfills. The composition of ash is very important because the content of certain oxides significantly influences the possible further use of ash. Determination of ash composition includes determination of oxide content: Na2O, K2O, CaO, MgO, Al2O3, Fe2O3 and SiO2. For their determination, the most commonly used is EDXRF spectrometer as an excellent analytical technique for fast and precise determination of a large number of elements in complex samples. The problem with the development of the EDXRF method for analyzing the composition of ash biomass lies in providing a sufficient number of reference materials for method calibration. As there are no reference biomass materials available on the market, one way is to determine the composition of ash by another analytical technique (ICP-OES) and apply these results as reference values for developing the EDXRF spectrometer method. The experimental work will include digestion of biomass ashes by microwave digestion and determination of the main elements of the ICP-OES. The determination method will be tested with the certified reference material NIST SRM 2690 Coal Fly ash. Based on the results obtained, the same ash samples will be used to calibrate the method for determining the composition of ash on EDXRF. After the method is developed, validation will be performed. The method for determination of ash composition will be applied on real samples of ash from the bio power plant.

• Keywords: sastav pepela; mikrovalna digestija; EDXRF spektrometar; ICP-OES analitička tehnika
• Keywords (english): ash composition; microwave digestion; EDXRF spectrometer; ICP-OES analytical technique
• Language: croatian
• URN:NBN: urn:nbn:hr:149:558676
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-10-26 11:56:29