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高炉喷吹煤粉的灰熔点太低会加速煤粉颗粒间的聚集及沉积,易导致风口或喷枪前结渣。同时,低灰熔点灰分熔化时会阻碍氧气进入尚未燃尽的煤粉颗粒内部,降低煤粉燃烧率。灰熔点太高,会影响高脱硫及炉渣的排放。因此,灰熔融特性是高炉喷吹煤粉不容忽视的性质。采用灰熔点测定仪和FactSage软件对济钢常用的贫瘦煤、无烟煤和烟煤的灰熔融特性进行对比研究。结果表明:两种方法得到的灰熔点结果具有一致性,煤的灰熔点与煤灰成分密切相关,煤灰的硅、铝含量高,灰熔点就偏高,钙、镁含量高,则灰熔点偏低。这为济钢高炉合理配煤提供了一项重要指标。
Blast furnace pulverized coal injection ash ash melting point is too low will accelerate the accumulation and deposition of coal particles, easily lead to the tuyere or spray gun before slagging. At the same time, melting ash with low ash melting point will prevent oxygen from entering the unburnt coal particles and reduce the combustion rate of pulverized coal. Ash melting point is too high, will affect the high desulfurization and slag emissions. Therefore, ash melting characteristics of the blast furnace pulverized coal injection can not be ignored. The ash melting characteristics of lean, anthracite and bituminous coal commonly used in Jinan Iron and Steel Company were studied by ash melting point measuring instrument and FactSage software. The results show that the results obtained by the two methods are consistent. The ash melting point of coal is closely related to the composition of coal ash. The content of silicon and aluminum in coal ash is high, the melting point of ash is high, while the content of calcium and magnesium is high, Low. This provides an important indicator for the rational coal blending of Jining Steel’s blast furnace.