铁钢比变化对吨钢综合能耗影响分析方法

Analysis method of influence of iron steel ratio change on comprehensive energy consumption per ton of steel

在碳达峰、碳中和背景下,增加废钢消耗比例、降低铁钢比可直接影响钢铁企业吨钢综合能耗下降,是中国长流程钢铁企业能效提升、节能降碳的有效路径,已成为钢铁行业研究热点。首先结合长流程钢铁生产实际从热量平衡角度简要分析了降低铁水热量损失、提高废钢入炉温度、降低转炉出钢温度等降低铁钢比的主要途径和相应技术措施。为了完整量化分析铁钢比变化对钢铁企业吨钢综合能耗的影响,以钢铁企业系统节能原理为基础,在传统的铁前工序钢比系数、转炉炼钢工序能耗变化影响分析的基础上,增加了由于铁钢比变化导致吨钢余能回收对吨钢综合能耗的影响,并提出了铁钢比变化对长流程钢铁企业能耗影响定量分析方法。最后以若干钢铁企业实际数据为例进行了定量分析,在该案例条件下,铁钢比从基准期0.950降低至统计期0.790,铁前工序钢比系数、转炉炼钢工序能耗、吨钢余能回收三者变化分别影响吨钢综合能耗下降71.282 kgce/t、下降1.000 kgce/t、增加9.687 kgce/t,合计影响吨钢综合能耗下降62.595 kgce/t。该案例定量分析显示铁钢比平均每降低0.01,吨钢综合能耗下降3.912 kgce/t,铁钢比下降能够有效提升长流程钢铁企业吨钢综合能耗水平。

In the context of carbon peak and neutralization,increasing the proportion of scrap consumption and reducing the iron/steel ratio can directly affect the decline of comprehensive energy consumption per ton of steel in iron and steel enterprises.Reducing the iron/steel ratio is an effective way to improve energy efficiency,save energy and reduce carbon in China′s iron and steel enterprises based on integrated iron and steel route production,which has become a research hotspot in the iron and steel industry.The main ways and corresponding technical measures to reduce the iron/steel ratio,such as reducing the heat loss of molten iron,increasing the temperature of scrap entering the furnace and reducing the tapping temperature of converter,are briefly analyzed from the point of view of heat balance.In order to completely and quantitatively analyze the impact of the change of iron/steel ratio on the comprehensive energy consumption per ton of steel in iron and steel enterprises,based on the system energy saving in iron and steel enterprises,this paper adds the impact of the recovery of residual energy per ton of steel caused by the change of iron/steel ratio on the comprehensive energy consumption per ton of steel on the basis of the change of iron/steel ratio,and puts forward the quantitative analysis method of the impact of the change of iron/steel ratio on the energy consumption of integrated iron and steel route enterprises.Finally,taking the actual data of several iron and steel enterprises as an example,the quantitative analysis is carried out.Under the condition of this case,the iron/steel ratio is reduced from 0.950 in the benchmark period to 0.790 in the statistical period.The changes of the steel ratio coefficient in the pre iron process,the energy consumption in the steelmaking process and the recovery of residual energy per ton of steel affect the comprehensive energy consumption per ton of steel by-71.282 kgce/t,-1.000 kgce/t and 9.687 kgce/t respectively,and the total comprehensive energy consumption per ton of steel is reduced by 62.595 kgce/t.The quantitative analysis of the case shows that the comprehensive energy consumption per ton of steel decreases by 3.912 kgce/t for every 0.01 reduction of iron/steel ratio.The decline of iron/steel ratio can significantly improve the performance of comprehensive energy consumption per ton of steel in integrated iron and steel route enterprises.