The paper presents results of coal behaviour during combustion in oxy-fuel atmosphere. The experiment was performed using 3 meter long Entrained Flow Reactor and 1 meter long Drop Tube Reactor. Three hard coals and two lignites were analysed in order to investigate NOx, SO 2 emission and fly ash burnout. The measurements were performed along and at the outlet of a combustion chamber for one-and two -stage combustion. In the second stage of the experiment, kinetic parameters for nitrogen evolution during combustion in oxy -fuel and air were calculated and the division of nitrogen into the volatile matter and the char was measured. The conducted experiment showed that emissions in oxy -fuel are lower than those in air.
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