多约束条件下回转窑-氧煤燃烧熔分炉热工分析

Thermal analysis of rotary kiln-oxygen combustion melting furnace under multi-constraint conditions

传统高炉炼铁工艺具有冶炼流程长、污染物排放大的问题,因此非高炉炼铁技术引起了国内外学者的广泛关注。通过建立热量与物料平衡耦合的数学模型,对回转窑预还原-氧煤燃烧熔分炉物料平衡和热平衡进行计算,揭示不同金属化率、煤气氧化度及鼓风氧含量条件下的热工参数变化规律,最后使用Lingo软件对工艺进行热工分析,确定回转窑内预还原金属化率等与熔分炉适宜煤粉消耗量的关系。结果表明,升高金属化率、煤气氧化度及鼓风氧含量均可以降低工艺煤耗和氧耗,但煤气量及煤气热值并不会随着操作参数的升高而达到最优,在对工况参数进行最优求解后得知,在炉料金属化率为70%、熔分炉煤气氧化度为16%且鼓风氧为100%时,回转窑-氧煤燃烧熔分炉工况条件最好。

To solve the problem of the long smelting process and large pollutant discharge in the traditional blast furnace ironmaking process,non-blast furnace ironmaking technology has attracted extensive attention from scholars at home and abroad.By establishing a mathematical model coupling the heat and material balance,the material balance and heat balance of the rotary kiln pre-reduction-oxygen combustion furnace were calculated,revealing the process parameters under different metallization rates,gas oxidation degrees and blast oxygen contents.The variation law was finally carried out.The thermal analysis of the process was carried out using Lingo software,and the relationship between the pre-reduction metallization rate in the rotary kiln and the suitable coal consumption of the melting furnace was determined.The results show that increasing the metallization rate,gas oxidation degree and blasting oxygen content can reduce the coal consumption and oxygen consumption of the process,but the gas volume and gas calorific value will not be optimal with the increase of operating parameters.After the optimal solution of the working condition parameters,it was known that the rotary kiln-oxygen combustion melting furnace condition was used when the charge metallization rate is 70%,the melting furnace gas oxidation degree is 16%,and the blast oxygen content is 100%,which is the best condition.