Abstract <p>The ignition of mechanically active coal at different stages of metamorphic development in boilers at thermoelectric power plants is considered. In experiments on coal ignition, a vertical tubular furnace is employed. The reactivity of coal activated in a disintegrator is determined by thermogravimetric analysis. The results indicate that the ignition temperature of mechanically activated coal in a vertical tubular furnace is considerably lower than that of the initial coal. On that basis, the fuel oil generally used for flame ignition may potentially be replaced by coal. The ignition and combustion parameters required for different types of fuel are determined. The components of the flux of gaseous combustion products for different types of coal are detailed, and the characteristics of alternative methods of heat generation are compared. The results may be used in the construction and modernization of power stations.</p>