TUBE-TYPE FURNACE Russian patent published in 1997 - IPC

FIELD: heating appliances for fluid media; oil, chemical and other industries for heat treatment of thermolable and thermally unstable liquids having technological and other limitations pertaining to maximum heating temperature. SUBSTANCE: furnace has cylindrical heat exchange chamber, burner devices and coil consisting of straight and bent sections of tubes; coil is located in chamber near side wall. Innovation of invention consists in availability of straight sections of additional product tubes in coils at end walls of chamber; inner coil with band welded spacers between adjacent straight sections of product tubes is made in form of cylinder with open ends whose diameter is lesser than that of near-wall coil; it is located inside near-wall coil concentrically relative to it; one side of it adjoins tubes on end wall and other side forms clearance with adjacent end wall. Burner devices are diametrically opposite; they are located on side wall of heat exchange chamber; axial lines of outlet passages of diametrically opposite burner devices pass tangentially relative to diametrically opposite sides of conventional cylinder which is concentric to coils and is located in circular space between them. EFFECT: enhanced efficiency due to intensification of heat exchanger between heat transfer surface and fuel combustion products; smooth distribution of temperature in gas volume of heat exchanger chamber and density of thermal flow over heat transfer surface. 3 dwg