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Exposure of refractory materials during high-temperature gasification of a woody biomass and peat mixture
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Luleå University of Technology, Luleå, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
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2018 (Engelska)Ingår i: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, nr 2, s. 777-787Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Finding resilient refractory materials for slagging gasification systems have the potential to reduce costs and improve the overall plant availability by extending the service life. In this study, different refractory materials were evaluated under slagging gasification conditions. Refractory probes were continuously exposed for up to 27 h in an atmospheric, oxygen blown, entrained flow gasifier fired with a mixture of bark and peat powder. Slag infiltration depth and microstructure were studied using SEM EDS. Crystalline phases were identified with powder XRD. Increased levels of Al, originating from refractory materials, were seen in all slags. The fused cast materials were least affected, even though dissolution and slag penetration could still be observed. Thermodynamic equilibrium calculations were done for mixtures of refractory and slag, from which phase assemblages were predicted and viscosities for the liquid parts were estimated.

Ort, förlag, år, upplaga, sidor
Elsevier, 2018. Vol. 38, nr 2, s. 777-787
Nyckelord [en]
Gasification, Oxygen blown, Biomass, Entrained flow, Slag, Refractory
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:umu:diva-143620DOI: 10.1016/j.jeurceramsoc.2017.09.016ISI: 000418211000047Scopus ID: 2-s2.0-85029532285OAI: oai:DiVA.org:umu-143620DiVA, id: diva2:1178576
Projekt
Bio4EnergyTillgänglig från: 2018-01-30 Skapad: 2018-01-30 Senast uppdaterad: 2020-01-08Bibliografiskt granskad
Ingår i avhandling
1. Refractory corrosion in biomass gasification
Öppna denna publikation i ny flik eller fönster >>Refractory corrosion in biomass gasification
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Alternativ titel[sv]
Korrosion av eldfasta material i biomassaförgasning
Abstract [en]

To stop the net emission of CO2 to the atmosphere, we need to reduce our dependency of fossil fuels. Although a switch to a bio-based feedstock hardly can replace the total amount of fossils used today, utilization of biomass does still have a role in a future in combination with other techniques. Valuable chemicals today derived from fossils can also be produced from biomass with similar or new technology. One such technique is the entrained flow gasification where biomass is converted into synthesis gas. This gas can then be used as a building stone to produce a wide range of chemicals.

Slagging and corrosion problems are challenges presented by the ash forming elements in biomass during thermochemical energy conversion. The high temperature in the entrained flow process together with ash forming elements is creating a harsh environment for construction materials in the reactor. Severe corrosion and high wear rates of the lining material is a hurdle that has to be overcome to make the process more efficient.

The objective of this work is to investigate the nature of the destructive interaction between ash forming elements and refractory materials to provide new knowledge necessary for optimal refractory choice in entrained flow gasification of woody biomass. This has been done by studying materials exposed to slags in both controlled laboratory environments and pilot scale trials. Morphology, elemental composition and distribution of refractories and slag were investigated with scanning electron microscopy and energy dispersive X-ray spectroscopy. Crystalline phases were investigated with X-ray diffraction, and thermodynamic equilibrium calculations were done in efforts to explain and make predictions of the interaction between slag and refractory.

Observations of slag infiltration and formation of new phases in porous materials indicate severe deterioration. The presence of Si in the materials is limiting intrusion by increasing the viscosity of infiltrated slag. This is however only a temporary delay of severe wear considering the large amount of slag that is expected to pass the refractory surface. Zircon (or zirconium) (element or mineral?) based material show promising properties when modeled with thermodynamic equilibrium, but disassembling of sintered material and dissociation of individual grains was seen after exposure to a Si- and Ca-rich slag. Fused cast materials have a minimal slag contact where the only interaction is on the immediate hot face. Dissolution was however observed when exposed to a silicate-based slag, as was the formation of NaAlO2 after contact with black liquor.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå Universitet, 2018. s. 62
Nyckelord
Refractory corrosion, slag, biomass, gasification
Nationell ämneskategori
Energiteknik
Forskningsämne
materialvetenskap
Identifikatorer
urn:nbn:se:umu:diva-152664 (URN)978-91-7601-944-3 (ISBN)
Disputation
2018-11-09, Hörsal N360, Naturvetarhuet, Johan Bures väg 16, Umeå, 13:00 (Svenska)
Opponent
Handledare
Tillgänglig från: 2018-10-19 Skapad: 2018-10-17 Senast uppdaterad: 2018-10-18Bibliografiskt granskad

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