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Exposure studies of refractory materials for biomass gasification
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik. (Energiteknik och Termisk Processkemi)
2013 (engelsk)Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
Abstract [en]

Gasification is a technology mostly used to convert fossil feedstock to syngas. Biomass could be used as a feedstock instead but that puts different demands on, among other things, the materials in these reactors.

In this work, two candidate materials for the inner lining in biomass gasifiers (63 and 85 weight percent Al2O3) have been exposed to three synthetic ashes, K2CO3-CaCO3-SiO2, K2CO3-CaCO3 and K2CO3 at 1050°C in CO2 atmosphere for 7 days in a muffle furnace to reproduce analogous chemical attack that would occur in a real gasifier. Samples were investigated with SEM-EDX for morphological and compositional effects and with XRD for crystalline phases at chosen distances from the exposed surface.

A heterogeneous melt that prevented deep penetration of alkali was produced when Si was present in the ash composition. In the absence of Si, it turned out that only K was affecting the materials. K attacked the matrix and transported into the material and attacking grains. For the material containing more alumina potassium was found in continuously decreasing amounts down to 7-8 mm from the exposed surface. The other material showed a distinct border between affected and pristine matrix about 5 mm from the exposed surface. The affected part seemed to have been filled out and signs of expansion could be seen. The XRD analysis of the pristine and exposed refractories revealed significant differences. In the exposed ceramics the new phases; Leucite, Kalsilite, Kaliophilite, K(2-x)Al(2-x)SixO4 and Wollastonite were observed.

sted, utgiver, år, opplag, sider
2013. , s. 38
Emneord [en]
Gasification, biomass, high alumina refractories, alkali, slag
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-66449OAI: oai:DiVA.org:umu-66449DiVA, id: diva2:606774
Fag / kurs
Energiteknik
Utdanningsprogram
Master of Science Programme in Energy Engineering
Presentation
2013-01-24, A201, X, Håken Gullessons väg 20, Teknikhuset, A201, Umeå, 13:59 (svensk)
Uppsök
Physics, Chemistry, Mathematics
Veileder
Examiner
Tilgjengelig fra: 2013-02-21 Laget: 2013-02-20 Sist oppdatert: 2013-02-21bibliografisk kontrollert

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