CYCLONIC HEAT-EXCHANGE UNIT FOR RECUPERATOR Russian patent published in 2006 - IPC F23L15/04 

FIELD: heat-exchanging equipment, particularly for air heating in industrial heat-and-power engineering.

SUBSTANCE: heat-exchange unit comprises annular and central channels formed by inner and outer tubes closed from the first ends by caps, air inlet and outlet pipes connected to the tubes and arranged in area opposite to the caps. Air inlet pipe is connected to the outer tube and is tangential to the tube. Inner tube is made as truncated cone having diameter increasing towards outer tube cap.

EFFECT: increased heat-resistance and thermal efficiency of cyclonic heat-exchange unit.