The thermal conversion of a fuel particle in a reactor depends on the operation conditions as well as on the properties of the fuel particles. In order to optimise the gasification process it is necessary to know the influence of e. g. the temperature, the fuel composition and the particle size on the chemical gasification and combustion reactions. The most important of these parameters have been investigated for the fuels wood, charcoal and bark with respect to a fluidised bed gasification using the following experimental facilities: * Thermogravimetric Analysis (TGA): The change of the particle characteristics due to the chemical consumption has been investigated by means of TGA at various gas atmospheres (oxidising, reducing and nitrogen atmosphere) and temperatures. During the experiments, the mass loss of the sample due to drying, pyrolysis and gasification as well as the composition of the produced gas (CO, CO2, H2, CxHy, etc.) have been measured as a function of time. * Experimental fluidised-bed reactor: In addition to the chemical conversion, the particle size will be reduced due to thermal stress and attrition which depend on e. g. the gas velocity, the bed material and the temperature. These parameters have been investigated under gasification conditions in an experimental fluidised-bed reactor at temperatures up to 800°C.
|Effective start/end date
|1/01/95 → 31/01/00
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