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Gewählte Master / Diploma Thesis:

Christian Reichinger (2010): Optimierung angepasster Wärmenutzungssysteme bei Biogasanlagen mit Kraftwärmekopplung.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 147. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
In most of European biogas plants the produced biogas will be used in CHP´s for electricity production. In many cases the produced heat is only used to a limited extent due to the fact that many biogas plants are built in the outskirts and an economical and technical utilisation is not feasible. If the heat remains unused, more than 50 % of produced energy will be lost. The aim of the project was to optimise the heat utilisation of biogas plants by the installation of a heat consumer appliance. In detail, a woodchip dryer, a grain dryer and a dorset belt dryer were installed and investigated at a praxis biogas plant (Utzenaich, Austria). The available and used heat was measured at the 500 kWel CHP of the biogas plant and in each of the three dryers. According to the measured parameters, specific heat consumption and the level of heat utilisation of each drying system were calculated. Based on these results the settings of the three dryers were optimised. The results of the project show that the heat utilisation on biogas plants can be substantially increased. Doe to the optimisation of dryer settings, the average daily and total annual heat utilisation could be increased from 70 to nearly 96 %. The specific heat consumption (include heat losses) were in the maize-drying 1,8 kWh/kg water, in the wood chips dryer 4,3 kWh/kg water and in the dorset belt dryer 2,6 kWh/kg water. Especially through technical improvements at the biogas plant and dato the integration of grain and woodchip dryers the efficiency could be increased. Therefore this project has demonstrated that the total utilisation of produced heat from biogas plants - also from outskirts - is possible.

Beurteilende(r): Amon Thomas

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