为降低炼铁成本，采用增加烟煤配比、控制煤粉粒度、降低煤粉灰质量分数、添加助燃剂等方法改善了喷煤效果。同时，以精料入炉为基础，改善焦炭质量为关键，采取中心加焦、适度开放边缘等操作改善料柱透气性，控制适宜炉温，提高顶压。结合高风温、富氧等技术优化高炉操作，在保持较高置换比条件下，最终达到合理喷吹煤粉降低焦比和燃料比的效果。
In order to reduce the cost of ironmaking through coal injection improvement, a series of measures to enhance the result of coal injection were taken, such as increasing the ratio of bituminous coal in blended pulverized coal, controlling pulverized coal size, decreasing coal ash content and adding combustion catalyst, etc. Moreover, blast furnace operations were also improved, including the application of quality burden and coke, rational burden distribution with central coke charge, proper opening peripheral gas flow to improve the pemeability of burden column, controlling hearth temperature and increasing top pressure. In the conditions of high blast temperature and oxygen enrichment, the replacement ratio of coal injection was kept in a higher level. As a result, both coke rate and fuel rate of the blast furnaces were reduced.
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