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为了使武钢高炉达到经济性喷煤的目标,通过煤资源调查,掌握了适合武钢喷吹用煤的煤源情况;通过对高炉大煤比条件下的风口理论燃烧温度进行计算,分析了影响高炉喷煤的主要因素;通过对武钢高炉炉尘中的残碳量及其来源进行分析,发现目前操作条件下炉尘中源自煤粉的碳量占总碳量的10%左右,此结果已用于研究未燃煤粉在炉内的利用状况及评估高炉喷吹煤粉的燃烧情况;通过对高炉操作指标进行统计分析,发现煤比在160~170 kg/t时,高炉燃料比较低。实践结果表明,上述经济性喷煤技术在5号高炉应用后,在煤比仅略增加0.8 kg/t的情况下,焦比降低了9.7 kg/t。
In order to achieve the goal of economic coal-fired blast furnace in WISCO blast furnace, a coal source suitable for injecting coal in WISCO was grasped through investigation of coal resources. Based on the calculation of the theoretical combustion temperature of tuyere under large coal blast ratio, By analyzing the residual carbon content and its source in the furnace dust of WISCO blast furnace, it is found that the amount of carbon from the pulverized coal in the furnace dust under current operating conditions accounts for about 10% of the total carbon content. It is used to study the utilization status of unburned coal in the furnace and to evaluate the combustion of pulverized coal injection. Through the statistical analysis of blast furnace operation indexes, it is found that the fuel ratio of blast furnace is low when the coal ratio is between 160 and 170 kg / t. The practice results show that after the above economical coal injection technology is applied in No.5 blast furnace, the coke ratio decreases by 9.7 kg / t when the coal ratio is only slightly increased by 0.8 kg / t.