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Gewählte Master / Diploma Thesis:

Irene Schmutzer - Roseneder (2012): Einfluss von Holzart und Rohstoff auf die Entstehung von Emissionen von Holzpellets während der Lagerung.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 70. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Because of high energy density of pellets, consistent quality and increasing demand, pellets as solid biomass fuels are gaining more and more importance. During the storage of pellets emissions are released. These emissions are due to degradation of wood components. There are already several publications describing the occurrence and composition of these emissions in pellet storages. However the causes and reactions which are responsible for the release are unknown. This lack of information supports the investigation of various wood raw materials and pellets. Present thesis deals with the analysis of released carbon monoxide (CO) and volatile organic compounds (VOCs) from different raw wood materials and pellets in sealed storages. Furthermore, the organic extractive content of these wood samples are determined by soxhlet extraction. In order to identify possible correlations between the release of emissions and the organic extractive content these characteristics are compared. Norway spruce (Picea abies), European larch (Larix decidua) as well as the loblolly pine (Pinus taeda) are examined. Therefore different kinds of sawdust, shavings and pellets are studied. In addition, several pellets available on the Austrian market are examined. The highest (2.88 mg of CO/kg fuel dry matter/d) and the lowest (0,02 mg of CO/kg fuel dry matter/d) release rate of CO were reported with fresh pine pellets and pellets from Austrian market, respectively. In all the sealed storage trials wood samples release more CO than VOCs. The organic extractive content of the pine samples is the highest one. Otherwise the spruce shavings contain the lowest quantity of organic extractives. Throughout all samples the organic extractive content decreases after pelletizing. In addition, the organic extractive content of spruce sawdust declines with increasing drying temperature. A definite correlation between organic extractive content and released quantities of emissions could not be established.

Beurteilende(r): Weingartmann Herbert

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