RECUPERATOR Russian patent published in 1998 - IPC

FIELD: waste-heat recovery devices for heating gas (air) in heating and heat-treating furnaces; petrochemical industry, mechanical engineering and metal working industry. SUBSTANCE: recuperator includes coaxial outer and inner ducts. Inner is made in form of gas-permeable cylinder mounted rotatably and provided with blades forming central smoke passage and outlet branch pipes located tangentially to circular passage. According to invention, blades of inner duct are made in form of helical partitions of circular gas (air) passage. pitch of partition helical surface ranges from 0.625 to 0.125 D_in, where D_in is inner diameter of outer duct. EFFECT: enhanced efficiency due to increased factor of utilization of flue gas heat. 2 dwg