高炉喷吹除尘灰的研究

 由于高炉除尘灰含有大量的铁和碳，且其排放造成严重的环境污染，因此通过现有的喷煤系统将其作为含铁原料和含碳原料从风口喷入高炉无疑是处理除尘灰的一种有效途径。考虑到喷吹除尘灰影响到炉内炉渣的碱度、铁水的硫含量、理论燃烧温度和焦比的变化，通过高炉物料平衡和局部热平衡模型计算了焦比、炉渣碱度和理论燃烧温度随喷入除尘灰量的变化，为高炉操作提供理论依据，并进行了工业试验。结果表明，焦比和炉渣碱度随除尘灰喷入量的增加而下降，而理论燃烧温度则变化不大，这些变化可以通过调整配料来应付；喷吹除尘灰后高炉透气性略有下降，所需喷吹压力增大，试验证明高炉喷吹自身的除尘灰是可行的。

Preliminary Study on Blast Furnace Dust Injection Into Blast Furnace

Blast furnace dust contains a great deal of iron and carbon, and it causes serious pollution without disposal, thus it may be an effective disposal method to inject the dust back into the blast furnace using the popular pulverized coal injection equipment. Considering the possible change of slag basicity, sulfur content in hot metal, theoretical combustion temperature, and coke ratio inside the furnace with dust injection, a mass balance and local heat balance model was developed to calculate the change of coke ratio, slag basicity and theoretical combustion temperature with dust injection which provides theoretical basis for blast furnace operation and industrial test was carried out to confirm the idea and model. The results show that, with the increase of dust injection rate, the coke ratio and slag basicity decreased significantly while the theoretical combustion temperature did not change very much, and these changes could be handled by adjusting the ratio of sinters to pellets. Besides, with the increase of dust injection rate, the permeability of blast furnace decreased a little and blowing pressure was increased. In general, blast furnace dust injection into blast furnace is feasible.