The invention relates to a system, method and injection device for flue gas denitrification in a combustion chamber by selective, non-catalytic reduction, comprising: a dynamic real-time simulation model which calculates and determines in a temporal updating interval a current three-dimensional temperature distribution in the combustion chamber and the three-dimensional position and the three-dimensional development of a reaction zone; sensors for detecting and optionally real-time detecting thermal data in the combustion chamber, these sensor data being fed as input variables to the dynamic real-time simulation model; one or more injection devices, each of which can be moved via one or more drives, a reactant being injected into and distributed in the reaction zone by means of the injection devices; and a regulating arrangement which regulates the position and amount of reactant injected.
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