Replacing classical fuels by fuels based on waste brings the positive effect of CO_2 reduction and the sparing of fossil fuels used, which is the basis of sustainable development. The safe combustion of various types of waste in the incineration installations needs defining some indicators that can be used for comparison between these types of fuels and classical fuels. In the paper following indicators were proposed and defined: reaction front rate, ignition rate, rate of mass decrement and grate thermal load. The numerical values of these indicators were determined during experiments performed in Forschungszentrum Karlsruhe (Reactor KLEAA - Fig. 1.1), in Institute of Technical Chemistry, in the Unit for Thermal Waste Utilization and in Chair of Technologies and Installations for Waste Utilization Silesian Technical University. The experiments were performed in reactors of thermal load 25kW (KLEAA) [1] and 5kW. The influence of various parameters on the combustion process was investigated: particles size, moisture, process temperature, air excess ratio. The obtained indicators can be used for describing combustion process in industrial conditions. The possibility of application of combustion assessment indicators in boundary problems formulation in Fluent software in ANSYS 12.1 module was presented in the paper.
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