HEAT EXCHANGER Russian patent published in 1997 - IPC

FIELD: roasting of materials in manufacture of building materials and other industries. SUBSTANCE: heat exchanger includes hollow closed members secured on movable axle inside rotary furnace; they have diameter D and length $$$ where $$$ is angle of slope of material. Radius of suspension of axle relative to inner surface of furnace is determined from condition of obtaining preset degree of replacement of material at each revolution of furnace which is determined in its turn by heat resistance of material of member. EFFECT: enhanced efficiency. 2 cl, 2 dwg