RADIANT AIR HEATER Russian patent published in 1998 - IPC

FIELD: recovery of heat of high-temperature exit gases. SUBSTANCE: heater has inner and outer cylindrical shells with sealed annular space between them; it is provided with guide baffle plates; closed loops incorporating uptake tubes are placed in gas channel; downtake tubes placed in annular space between shells are filled with high-temperature coolant; some of downtake tubes are placed in stack channel upstream of inner shell and some of them, on channel between outer shell and brickwork. EFFECT: enlarged heat-transfer surface and equalized temperature between inner and outer shells which reduces thermal stress and improves operating reliability. 3 dwg