The article deals with the results of developing the mathematical model of solid fuel combustion in the power boiler by adopting the method of low-temperature swirl combustion, generation and conversion in the combustion process of nitrogen and sulfur oxides. The quantitative evaluation procedure is developed. It is carried out the comparison of calculation results with experimental data obtained after the reconstruction of the new technology BKZ-220-9,8 of Novomoskovskaya TPP.