马钢2500m3高炉原燃料劣化条件下降低焦比的生产实践

在马钢2号2500m3高炉的生产实践中为了进一步降低生铁成本，提高大型高炉的综合经济效益，针对原燃料质量持续劣化的现状，通过采取小块焦回收再利用、强化入炉料管理、改善喷吹煤质量、优化上下部调剂、稳定炉温和改善渣系、高风温及富氧综合喷吹、高顶压操作、加强炉型管理等一系列措施，使煤比大幅度提升，焦比显著降低。在燃料比无明显变化的情况下，焦比降低到320kg/t，与2012年相比，焦比降低了60~70kg/t，高炉利用系数稳定在2.4t/(m3·d)。

Practice of Decreasing Coke Ratio on 2500m3 Blast Furnace of Masteel Under Poor Conditions of Degraded Raw Material and Fuel

In order to further reduce the cost of pig iron and improve the economic efficiency of large sized blast furnace, considering the current situation of continuous deterioration of the quality of raw material and fuel of No.2 2500m3 sized blast furnace at Masteel, a series of technical measures, such as recycling the small coke, strengthening management of charging material, improving coal injection quality, optimizing adjustment of upper and lower parts of blast furnace, stabilizing hot metal temperature and improving slag system, applying high blast temperature operation combined with oxygen enrichment and pulverized coal injection, adopting high blast furnace top pressure operation, and strengthening the furnace type management were taken to optimize the manufacturing process. As a result, the coke rate was significantly decreased to 320kg/t. Comparing with 2012, the coke rate decreased by 60~70kg/t under the similar condition of fuel ratio. Meanwhile, the blast furnace utilization coefficient was stabilized at 2.40t/ (m3·d).