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In the article, using numerical methods, studies have been conducted to determine the effect of the moisture content of the burnt coal on the characteristics of the heat and mass transfer process. The combustion chamber of the PK-39 boiler of the real energy object of the Republic of Kazakhstan (Aksu TPP) was chosen as the object of the study. Temperature (T) and concentration (O2, CO, CO2) fields were calculated for Ekibastuz coal with working moisture equal to 5, 7, 9 and 11%.It is shown that an increase in the moisture content of coal leads to a decrease in temperature both in the area of the burners and at the outlet from the combustion chamber. The concentrations of oxygen, water and carbon dioxide also decrease with decreasing working moisture along the entire height of the combustion chamber. In the area where the burners are located, with an increase in moisture, the amount of carbon monoxide CO formed decreases; however, above the active combustion zone, an increase in moisture leads to a less intense process of afterburning of carbon monoxide CO to carbon dioxide CO2. The results of computational experiments on the combustion of pulverized coal in the combustion chamber of operating power object (boiler PK-39 at Aksu TPP) are compared with experimental data obtained in the course of field experiments carried out directly at the Aksu TPP.