| 摘要 |
1,045,861. Waste heat recuperators; indirect heating and cooling. WELLMAN INCANDESCENT FURNACE CO. Ltd. April 5, 1965 [April 16, 1964], No. 15741/64. Headings F4B and F4S. A spiral recuperator for a heat treatment furnace 10 comprises a central combustion air tube 18 surrounded in counter-flow heat exchange relation by two exhaust gas passages 20 and 21, the adjacent portions of said passages in the spiral being separated by heat insulation 24, 25 respectively, preheated air in passage 18 passing either to the frusto -conical burner 14 wherein fuel from pipe 13 and air are intimately mixed prior to combustion, or to exhaust gas frusto-cone 16, the exact proportion being controlled by flap valve 19. The combustion exhaust gas/air mixture burns round air entry tube 18 in block 12 thus utilizing the sensible heat in the gas to pre-heat the incoming combustion air which is blown by blower 22 from the centre of the spiral, the exhaust gas being extracted therefrom by extractor 23 connected to the ends of passages 20 and 21. |
