Propagation of Thermal Conversion Fronts

The conditions in the reaction zone determine the release rate of the N-precursors HCN and NH3 [11], Among these conditions are the properties of the fuel (e.g., N-content and particle size), parameters related to the combustion front (temperature and propagation velocity) and the gas composition in and directly above the combustion front. As the prediction of the mass fractions of the N-precursors is important for the final goal of this research, i.e., the prediction of NO formation of the complete furnace, a model is needed in which all these conditions are represented. 

To develop such a model, a further simplification can be made. In a reference frame attached to the grate, the process can be regarded as a one-dimensional sys- 

Drying zone Pyrolysis zone Combustion zona Gasification zone Char 

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