A combined 1D-fuel-bed and 3D-CFD model for the simulation of an innovative 35 kW screw burner has been developed and validated with experiments. The 1D-fuel-bed model is a further development of a previously presented walking column approach and accounts for the special transport conditions in a screw burner. A new reduced chemical mechanism…
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This work presents a methodology to perform the scale-up of a solid fuel furnace to a higher heat output with maintaining or improving the burn-out quality. As basis to derive the scale-up concept, an example of a 35 kW screw burner for biomass fuels is investigated. Based on the Pi-theorem, the relevant dimensionless parameters are derived and similarity rules for the…
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A profound understanding of the fuel conversion on a grate boiler is crucial for an optimised boiler operation with a minimised pollutant emission. This work presents gas measurements and numeric simulations of a 150 kW moving grate boiler. The fuel bed model considers drying, pyrolysis and gasification. In the experiments, temperature…
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Catalytic hydrothermal gasification (HTG) of organic matter over ruthenium nanoparticles supported on high surface area carbon poses the best catalytic system up to date for selective production of methane. The deactivation mechanisms of such catalysts have been partially explored focusing on sulfur poisoning and deactivation by nanoparticle sintering…
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Hydrothermal gasification (HTG) is a promising technology that allows the recovery of nutrients from wet biomass with simultaneous production of an energy-rich gas. In this work, wastewater effluent (leachate) obtained from a composter sanitary system operating without external connection to sewer pipes was used as a feedstock for HTG process. The leachate effluent was characterized…
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In a joint research project of five Swiss competence centres for energy research, scientists of the Paul Scherrer Institute PSI, the Swiss Federal Laboratories for Materials Science and Technology (Empa), Swiss Federal Instiute of Technology (ETH) Zurich, the Zurich University for Applied Sciences (ZHAW), the University…
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