To train aid information is driven on power fuels, their properties and calculations of foods of combustion, and also on efficiency of the use of warmth of fuel. The processes of preparation of hard fuels are considered to incineration in the pulverulent state. The substantive provisions of modern theory of fire-box processes are expounded.Physical processes are illuminated in heating and on exteriority of surfaces of heating of caldron. In detail considered methods of incineration of different fuels, construction of gas-rings and fire-box devices. Technical descriptions over of modern powerful steam and hot-water caldrons are brought, and also caldrons with a boiling layer.For the students of establishments of higher education of теплоэнергетических specialities, and also for инженеров-теплоэнергетиков, working in area of exploitation caldrons.