Model for simulation of reburning process was built using FLUENT computer code. The work was performed in two steps. At the beginning simplified chemical reaction scheme without reburning was applied in order to describe character of the process in the reactor. In the second step nine chemical reactions describing reburning process were selected. In both cases pressure fluctuations in reaction region were generated causing process intensification. Despite of the assumed simplification, good agreement of simulation and experimental results was acquired. Obtained spatial flow patterns, propagation of reactants and rates of chemical reaction allow for rational and effective modifications of the investigated process.