DEVICE FOR RECIRCULATION OF FLUE GASES INTO BOILER AIR DUCT Russian patent published in 1997 - IPC

FIELD: gas-and-oil-fired boilers. SUBSTANCE: device is mounted on standard flue and air duct of boiler in form of bypass pipe line with gate valve; flue is also provided with inlet head made in form of bend opened towards flow of gases. Air duct is provided with special nozzle made in form of bend directed in way of flow at curvature radius lesser than diameter of bypass pipe line. Nozzle is provided with straight-way pipe fitted coaxially relative to air duct not projecting beyond outer surface of bend. Outlet section of nozzle has shear at angle of 30 deg relative to vertical plane of air duct cross section. EFFECT: enhanced efficiency. 1 dwg