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Gewählte Master / Diploma Thesis:

Alex Abfalterer (2010): Mögliches Potential der Energiepflanzen in Österreich Biogene Festbrennstoffe und deren thermo-chemische Eigenschaften.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 141. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
The constant rise in the demand for electricity and heat has resulted in increasing importance of biomass and solid biofuels in public policy discussions in recent years. Here we consider this in the areas of forestry and agriculture and handle the following themes in detail. The Austrian forest area amounts to ca 3.96 million ha (according to ÖWI 2000/2002). This represents approximately 47.2 % of the national territory. According to ÖWI 2000/2002, however, only roughly two thirds of the annual growth is be used for all purposes. The agricultural area in Austria which was utilized for the production of energy crops in 2006 is estimated at 50,000 ha. This was mainly devoted to the production of biogas. Oilseeds, vegetable oil and biodiesel were produced in smaller quantities. The cultivation of miscanthus and energy wood as well as the use of straw for energy is still of relatively minor importance. Harvesting crops from forestry areas (wood) as well as agricultural areas (mown crop) are intermediate products which must be prepared and processed mechanically for the requirements of the specific conversion plants. Depending on the chemical composition, solid biofuels have significant variations concerning their fuel properties (heating or calorific value, water or ash content, etc.). These properties determine the possibilities and limitations of thermochemical conversion. Providing final or useful energy from solid biofuels takes place either by complete combustion or by previous conversion to secondary energy carriers. Consequently the thermochemical conversion always leads– whether in several (spatial and temporal) decoupled steps – in combustion (oxidation as completely as possible), whereby in such processes gaseous oxidation products (exhaust fumes) and unburned mineral residuals (ash) arise. The emissions produced during combustion can be reduced by further measures (creation of a combustion as completely as possible and/or an emissions control). The ash from combustion of untreated biomass includes high nutrients. Therefore returning the ash which is produced by thermochemical conversion to forestry and agricultural areas might contribute in closing the nutrient cycle.

Beurteilende(r): Braun Herbert

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