试论高炉燃料替代的降碳路径

Research on BF Carbon Reduction through Fuel Substitutes

为有效降低高炉工序的CO_(2)排放量,向高炉喷吹气体、液体或固体燃料来替代焦炭受到广泛的关注。以我国6家典型钢铁企业7座1800m^(3)级高炉2021年的主要技术经济指标为基础,重点分析了燃料比和煤比对高炉CO_(2)排放量的作用和影响。结果表明,6家典型钢铁企业高炉CO_(2)排放量约为1.419~1.595Vt,影响高炉CO_(2)排放量相关性最强的因素且最重要的指标是燃料比,而单纯提高喷煤比的技术手段并不是降低高炉CO_(2)排放量的决定性因素。因此,通过优化喷吹燃料的种类,以氢代碳,实现有效替代,才是降低高炉CO_(2)排放量的有效途径。

To effectively reduce CO_(2)emission generated during BF production,more and more steel producers are interesting in the solution of injecting gas,or using liquid or solid fuel as substitute of coke charge to BF.It is analyzed the influences of fuel rate and coal injection rate on the furnace CO_(2)emission based on the main techno-economic indicators of seven 1800m^(3)scale BFs owned by six typical steel producers in 2021.The results show that BFCO_(2)emission of these six typical steel producers spans from 1.419 to 1.595t/t,and fuel rate roles as the most important factor closely related to the CO_(2)emission.However,simply increasing the pulverized coal injection rate isn't the decisive way to reduce the CO_(2)emission,instead,selecting hydrogen as a substitute of carbon is more effective.