| 摘要 |
<p>704,321. Open-hearth furnaces. UNITED STEEL COMPANIES, Ltd., and CHESTERS, J. H. Nov. 28, 1950 [Dec. 5, 1949], No. 31197/49. Class 51 (2) In an open-hearth furnace in which roof failure is alleviated by supplying one or more curtains of air over and in contact with the affected areas, the air, heated by recuperator, passes from a duct 11 into vertical passages 12 on either side of a waste gases port 7, said passages 12 being united at their upper ends by a transverse passage 13 with which they merge to form an inverted U-shaped air inlet 14 supplying the air around and in opposite direction to the flame and waste gases issuing from a burner 6. In a modification suitable for a larger furnace, Fig. 5, some of the air is introduced through the inlet 14 and the rest through two series of holes or slots 20 positioned in the roof 15 further towards the fuel entry end of the furnace.</p> |
