PLANT FOR ROASTING GRANULAR MATERIALS Russian patent published in 1994 - IPC

FIELD: furnace plants. SUBSTANCE: plant consists of rotary furnace 1, sectional furnace 2 and cooler 3. Shafts of sectional furnace are arranged at angle of 60 or 90 deg relative to each other which makes it possible to increase productivity of plant by 1.5 to 2 times. To reduce return carriage of dust from rotary furnace, air ducts 9 are received by intake chamber 6 of sectional furnace under joints of lateral walls of shafts 4. Air ducts 9 connect intake chamber 6 with cooler 3, owing to which air is mixed with exhaust gases of rotary furnace without disturbing the flows of heat treated material. EFFECT: enhanced efficiency. 7 dwg, 1 tbl