土、小高炉从冷风改为热风会得到一系列的好处:每吨生铁的燃料消耗率可以大大减少,产量可以提高,炉子更好操作(减少发生炉缸冻结和严重炉冷的可能)。而且生铁质量也可以提高(含硫更低,矽更高)。我国绝大部份土高炉由于条件的限制,目前均采用冷风操作。冷风也能正常生产,有的生产指标还很好(例如,湖南土高炉冷风操作焦比低到过1左右, Soil and small blast furnaces get a series of benefits from cold to hot air: the fuel consumption per tonne of pig iron can be greatly reduced, the yield can be increased and the furnace can be operated better (reducing the possibility of freezing and severe furnace cooling). And pig iron quality can also be improved (lower sulfur, silicon higher). Most of our country because of the conditions of soil blast furnace are currently used cold operation. Cold wind can also be normal production, and some production indicators are still good (for example, Hunan blast furnace cold wind operation over low 1 or so,