宁钢高炉喷吹煤配煤结构探究

A Study of Pulverized Coal Blending Structure of Blast Furnace Injection in Ningbo Steel

制定合理的配煤方案对改善喷煤效果、降低燃料成本具有重要意义。以宁钢高炉5种喷吹煤及混合煤为实验原料,进行煤粉可磨性、着火点、煤灰熔融性和热重分析实验,分析各种煤粉的基础性能。在此基础上,调整煤粉配煤成分,确定经济高效的喷吹煤配煤结构。结果表明:配煤应以烟煤为主,稳定低挥发无烟煤配比,适当调整中挥发无烟煤的比例;在烟煤配比(质量分数)≥35%的条件下,煤粉挥发分质量分数控制在目标值18%左右,既能满足喷煤安全生产的需求,又能满足高炉生产对喷吹煤成分指标的要求。

Generating a reasonable coal blending scheme is of important significance for improving the effect of pulverized coal injection and reducing fuel cost. Taking five kinds of pulverized coal and mixed coal of blast furnace in Ningbo Steel as the materials, experiments of pulverize coal grindability, ignition, ash fusibility and thermal gravimetric analysis were carried out, the performances of various coal were analyzed. On this basis, the pulverized coal blending components were adjusted to determine the economic and efficient coal blending structure. Results show that coal blending should be based on bituminous coal, the ratio of low volatile anthracite should be stabilized, the proportion of volatile anthracite should be advisably adjusted. In condition of bituminous ratio more than 35% （mass fraction）, the pulverized coal volatile should be controlled in the target value about mass fraction of 18%, which can not only meet the needs of safe production of coal powder injection, but also can meet the requirements of blast furnace production to the composition index of coal injection.