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九三地区修理厂铸工张凤山不断改进熔炉结构,使炼铁率由每公斤焦炭出5—6公斤铁,增加到出铁10公斤。改进的办法很简单:他把炼铁炉气孔由30公厘增到50公厘;使气孔方向倾斜,与炉壁成81°45′,这样可使进入炉内的空气转向中间,使热力集中,1/3的空气带着铁水向下方流动。气孔在炉内的一端,上部突出60公厘、下部只突出45公厘,使从上流下的铁水不能堵塞气孔,省去了用人通气孔的时间。熔铁炉的圆形部分扩大了,使熔铁体积由100公斤增到120
Shoter Zhang Fengshan continued to improve the structure of the furnace in the Jiusan area repair factory. The ironmaking rate increased from 5-6 kg of iron per kilogram of coke to 10 kg of iron. The improvement was simple: he increased the air hole of the iron making furnace from 30mm to 50mm; inclined the air hole to 81°45′ with the wall of the furnace, so that the air entering the furnace could be turned to the middle to make the heat concentrated. 1/3 of the air flows down with molten iron. One end of the air hole in the furnace, the upper part of the projection 60 mm, the lower part only protrudes 45 mm, so that the molten iron from the upper stream can not block the pores, eliminating the need for ventilation holes. The round part of the melting furnace is enlarged, increasing the volume of molten iron from 100 kg to 120