One way to improve the energy value of solid fuels is to change the content of excess moisture in it. When studying the regularities of the development of heat and mass exchange processes during the heat treatment of a sample of coal at a rate of 5 deg/min. in an air atmosphere to obtain a full differential scanning calorimetry (DSC) curve at a temperature increase rate of 5 °C/min. It was established that the initial heating of the coal sample is accompanied by the removal of physical moisture to a temperature of 180 °C and an increase in its heat content (1 period). At a temperature of about 340 °C, the processes of activation of carbon oxidation processes with the release of excess heat (2 period) begin to de- velop, the intensity of which is noticeable by the change in the sample mass even at 460 °C and continues to 676 °C. The third period of heating the coal sample is associated with the development of endothermic decomposition processes of its components and continues to a temperature of 740 °C when the combustion of the combustible mass is completed. Studies of the kinetics of moisture removal of a sample of coal in the regime of isothermal heating at a temperature of 250 °C and a speed of washing with air of 2 m/s made it possible to establish a total drying time of 229 minutes with a duration of the growing desiccation rate of 12 minutes and a constant speed period of 20 minutes.Using the regularity of the movement of bulk materials in a tumble dryer, the drying time for coal is determined to an average relative humidity of 9 % 20-28 minutes with a filling degree of its working space of 20-25 %.The features of the formation of re-moisture of the dried sample of coal in an atmosphere of moist air limit the total duration of drying no more than 64-88 minutes, and the completion of the process of moisture removal with a residual moisture content of not less than 7 %.