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Gewählte Master / Diploma Thesis:

Niklas Illich (2022): Einfluss des thermochemischen Konversionsverfahrens auf die Pelletierfähigkeit und Pelletqualität von Biomasse.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 75. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Biochar could provide a substitute for fossil coal in industrial applications for which so far there is no alternative to carbon-rich energy sources. Biochar is thermochemically treated biomass, a renewable resource whose carbon content is enriched by adding heat under exclusion of oxygen. To improve handling, for safety reasons and to increase energy density, it may be necessary to compress biochar. Agglomeration in form of pelletisation is therefore a proven technology for untreated biomass. This work started with the production of biochar from three biomasses (wood chips, miscanthus, sunflower seed shells) using three carbonisation processes (HTC, torrefaction, pyrolysis) and subsequent pelletisation on a laboratory scale using a single pellet press. The water content (12 %, 18 %), the binder (starch, lignin) and the binder dosage (1 %, 5 %) were varied. The aim was to determine the mechanical strength of produced pellets as maximum compressive strength. In addition, a fuel analysis of all biochars was carried out so comparisons with fossil industrial energy sources could be made. In this respect, it was found that torrefaction and pyrolysis processes are suitable for converting biomass into coal-like states. Regarding pelletisation, it was found out that the pelletising ability decreases with increasing carbonisation. Pellets made from HTC coal showed the highest strengths, while those ones made from pyrolysis coal could not be compressed in most cases. The highest maximum compressive strengths were measured for HTC pellets with 12 % moisture and lignin as a binder, and for torrefied pellets with 12 % moisture and starch as a binder. At this point, further studies beyond the laboratory scale are necessary to statistically prove these trends on a larger scale.

Beurteilende*r: Pfeifer Christoph
1.Mitwirkender: Hrbek Jitka

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