Koraiewska, R.R.KoraiewskaWolf, C.C.Wolf2022-03-102022-03-102005https://publica.fraunhofer.de/handle/publica/350757Numeric modelling and simulation by means of Computational Fluid Dynamics (CFD) to describe the flow processes in waste combustion are regarded as state-of-the-art and are in successful, widespread use. A basic pre-condition for CFD simulation of the gas phase of a boiler is the provision of exact initial values by means of a suitable fuel-bed model. Of primary interest in simulation are the practical implementation and therefore the validity of the model calculations. In the project described here covering overall validation on an industrial-scale waste-to-energy plant, the development of a fuel-bed model yielded improvements in the basic boundary conditions for CFD simulation. Comprehensive measurements of temperatures, flue-gas concentrations and speeds were performed and compared with simulated values. Using the model approaches selected it was established that the model for CO burn-out and for a number of other simplified partial models, such as heat dissipation in the convective area of the heat exchangers, did not permit accurate analysis or forecasting for these sub-areas. However, good matches were achieved, in particular with regard to temperature and flue-gas concentration values for CO 2 and O 2. There were some mismatches in the speed components due, above all, to the turbulence prevailing in the first pass of waste-to-energy plants. Nevertheless, it was possible to identify tendencies.de620conference paper