Thermal treatment of biomass and municipal solid waste on grate systems is an efficient procedure for its energetic utilization. Due to harsh conditions within the combustion chamber, reliable measurements are difficult to obtain and extremely expensive. In the last years, numerical methods were developed to provide these information. Considering a particle-based method a mechanically and thermally fully interacting flow of reacting granular material can be realized. The spatial distribution of momentum, heat and mass fluxes released from the moving and reacting waste layer can be evaluated for subsequent use in boiler simulations. Interchanging these data in addition to the radiative exchange between waste layer and combustion chamber, a fully interacting model is available. The current work concentrates on the significance of an adequate modelling of the waste properties by using numerical waste incineration plant simulations. The composition of the input will be varied in several ways. Different waste definitions, object sizes, elementary compositions and heating values will be analyzed to study the sensitivity of the conversion in the moving bed on the mechanical agitation with respect to the release behavior and char combustion. Grate-related operational parameters such as primary air supply from below are taken into account.
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