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COREX预还原竖炉还原煤气中CO浓度较高,竖炉内部较大温度范围都存在发生析碳反应的可能性。从竖炉操作压力和温度两个方面,分析了竖炉内不同区域内的析碳行为,同时重点分析了预还原竖炉内析碳反应对金属化率和下降管析碳量的影响。理论分析表明,析碳比例增加1%,竖炉金属化率平均降低3.4%;采用冷煤气作为冷却介质时,析碳量明显增加,此时不宜将下降管温度控制在750℃以下,且反窜煤气比例超过10%时,应及时切换成用N2冷却。
COREX pre-reduction shaft furnace reduction gas CO concentration is higher, the larger furnace shaft temperature within the scope of the existence of the possibility of carbon analysis. From two aspects of operating pressure and temperature of shaft furnace, the carbon deposition behavior in different regions of shaft furnace was analyzed. Meanwhile, the effect of carbon deposition reaction on the metallization rate and desorption carbon in pre-reduction shaft furnace was analyzed emphatically. The theoretical analysis shows that the rate of metallization of the shaft furnace decreases by an average of 1% when the proportion of carbon is increased by 1%, and the amount of carbon precipitation increases obviously when the cold gas is used as the cooling medium. At this time, the temperature of the descending pipe should not be controlled below 750 ℃, Channeling gas ratio of more than 10%, it should be promptly switched to N2 cooling.