提高现有炼钢车间的生产能力,不仅要努力提高技术操作的水平,还需要改建或扩建旧的生产设备。在改建或扩建当中我们必须寻找最经济和最迅速的途径。对于那些依靠外地供给生铁的炼钢车间来说,合理的办法是将固体生铁预先熔化,对平炉实行热装,这佯可以缩短平炉的熔炼时间,从而使平炉生产的提高获得保证。这种措施在我国的某些平炉炼钢车间已经采用。遗憾的是目前在我国平炉车间里所设置的用来预先熔化金属炉料的化铁炉还限于采用冷风,而冷风化铁炉由于炉子温度低对于熔化废钢有着很大的限 Improve the production capacity of the existing steel plant, not only to improve the technical operation of the level, but also need to rebuild or expand the old production equipment. We must find the most economical and fastest way to rebuild or expand. For those steelmaking plants that rely on foreign supply of pig iron, it is reasonable to pre-melt the solid pig iron and apply hot charging to the hearth, which can shorten the melting time of the open hearth so that the increase in hearth production can be guaranteed. This measure has been adopted in some open hearth steelmaking plants in our country. Regrettably, the iron furnaces currently used for pre-melting metal charge in the open hearth furnace in our country are still limited to the use of cold winds, whereas the cold-formed iron furnaces have a large limit to the melting scrap because of the low furnace temperature