Optimization of the Coherent Combustion Process for Brown Coals in the Alai Coal-Bearing Region of the Kyrgyz Republic

The article presents the results of mathematical modeling of the coherent combustion process for brown coals from the Alai coal-bearing region (Chukur, Noruskol, Kyzyl-Bulak, Belalma, and Kozhokelen deposits in the Kyrgyz Republic). The study aimed to determine optimal combustion parameters considering the technical characteristics of southern Kyrgyz coals. Using a system of differential equations (Navier-Stokes, heat transfer, combustible particle mass, and Arrhenius), key parameters were calculated: total combustion time, burning rate, and thermal efficiency. It was established that the elevated ash content and moisture levels of certain coals in the Alai coal-bearing region necessitate adjustments to temperature regimes and grinding fineness (dispersion). The optimal particle size for achieving combustion efficiency >95% is 15–45 μm at temperatures of 1450–1550°C. The results provide practical recommendations for designing burner systems and operational regimes for boiler installations in the Kyrgyz Republic.