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高炉矿石还原过程中,煤气中的Ca与H_2同为还原剂。H_2主要来自鼓风湿份的分解;其次来自焦炭挥发份及矿石结晶水的分解,后者数值微小而稳定,约在0.7%以下。鼓风湿份于炉缸高温之下分解所需的热量为提高风温所对消时,那末生成的H_2在炉内上升,因参加高炉内还原反应,一部份H_2在高炉上部再度变为H_2O而放出热量,这一热量的应用,被解释为蒸汽鼓风操作时高炉降低焦比的主要原因之一。因此,搞清楚H_2参加还原的程度,对评价蒸汽鼓风操作的效果有现实意义。
During the process of blast furnace ore reduction, Ca and H 2 in the gas are the same reducing agents. H 2 mainly comes from the decomposition of blast air; followed by the decomposition of volatile coke and crystal water of ore, the latter is small and stable, about 0.7% or less. The amount of heat required to decompose the blast air at high temperature in the hearth furnace is used to increase the temperature of the air. The H 2 generated in the blast furnace rises in the furnace. Due to the reduction reaction in the blast furnace, part of the H 2 becomes H 2 O in the upper part of the blast furnace again The release of heat, the application of this heat, was explained as one of the main reasons why the blast furnace reduced the coke ratio during steam blast operation. Therefore, figuring out the extent to which H_2 participates in reduction is of practical significance in assessing the effect of steam blow operation.