我厂于1970年自制两坐熔化率为3～3.5吨/时的多排小风口热凤曲线炉膛冲天炉(见图1),1975年正式使用,效果尚好。但是,多排风口冲天炉结构复杂,操作不便,特别是当使用劣质燃料时,风眼易堵塞,不仅影响获得高温优质铁水,有时还迫使中途打炉,影响生产。1976年初,热风炉胆报废,曾改为冷风中央送风,虽看炉方便,但元素烧损严重,炉渣呈黑色,出 I plant in 1970 made two sit melting rate of 3 to 3.5 tons / hour multi-row small outlet hot Feng curve furnace Cupola (see Figure 1), formally used in 1975, the effect is still good. However, the structure of multi-outlet cupola is complicated and inconvenient to operate. Especially when low-grade fuel is used, the eye of the eye is easily clogged, which not only affects the high-quality high-quality hot metal, but also forces the middle of the furnace to affect the production. In early 1976, the hot air furnace gallbladder was scrapped, has been replaced by the cold air central air, although the stove is convenient, but the elements burned seriously, the slag was black, out