低碳炼铁技术探讨  

DISCUSSION AND ANALYSIS OF LOW-CARBON IRONMAKING TECHNOLOGY

作　　者：张奔[1] 李传民[1] Zhang Ben;Li Chuanmin(Capital Engineering&Research Incorporation Limited,Beijing 100176)

机构地区：[1]中冶京诚工程技术有限公司,北京100176

出　　处：《河北冶金》2024年第10期1-7,共7页Hebei Metallurgy

基　　金：中国五矿科技专项计划资助项目(2020ZXA01)。

摘　　要：本文从减碳潜力的角度分析探讨了富氢碳循环氧气高炉技术和氢基竖炉直接还原技术的应用前景。以富氢碳循环氧气高炉技术为代表的长流程低碳冶炼技术降低碳排放量的理论极限约50%,有助于我国钢铁工业现阶段实现较大的减碳效果,而采用富氢气体作为还原剂的竖炉工艺,在技术层面已具备进一步提高氢气比例的能力,甚至可以将氢气比例提高到100%,通过化学反应、反应热力学和反应动力学等机理分析,探讨了MIDREX和ENERGIRON工艺不同参数选择的本质原因。在还原气相同时,MIDREX工艺和ENERGIRON工艺的竖炉内气体中H_(2)/CO不同,是由重整方式不同决定的,H_(2)/CO越高越符合氢冶金的需求;竖炉内压力越高,还原速度越快,还原气体利用率越高,可以提高单位容积竖炉的产量,减小设备总重量;气体入炉温度主要由炉内气体成分决定,为充分发挥H_(2)的还原能力,同时避免炉内粘结的发生,气体入炉温度选择在950℃左右,H_(2)比例高,气体入炉温度可以适当提高。This article analyzes and discusses the application prospects of hydrogen rich carbon circulating oxygen blast furnace technology and hydrogen based vertical furnace direct reduction technology from the perspective of carbon reduction potential.The theoretical limit for reducing carbon emissions in long process low-carbon smelting technology,represented by hydrogen rich carbon cycle oxygen blast furnace technology,is about 50%,which helps China's steel industry achieve significant carbon reduction effects at the current stage.The vertical furnace process using hydrogen rich gas as a reducing agent has the ability to further increase the hydrogen gas ratio at the technical level,and can even increase the hydrogen gas ratio to 100%.Through mechanism analysis of chemical reactions,reaction thermodynamics,and reaction kinetics,the essential reasons for the selection of different parameters in MIDREX and ENERGY processes were explored.At the same time of reducing gas phase,the H_(2)/CO in the vertical furnace gas of MIDREX process and ENERGY process is different,which is determined by the different reforming methods.The higher the H_(2)/CO,the more suitable it is for hydrogen metallurgy;The higher the pressure inside the vertical furnace,the faster the reduction rate,and the higher the utilization rate of the reducing gas,which can increase the output per unit volume of the vertical furnace and reduce the total weight of the equipment;The temperature of gas entering the furnace is mainly determined by the composition of the gas inside the furnace.In order to fully utilize the reducing ability of H_(2)and avoid the occurrence of bonding inside the furnace,the temperature of gas entering the furnace is selected at around 950℃.With a high proportion of H_(2),the temperature of gas entering the furnace can be appropriately increased.

关 键 词：低碳炼铁 碳减排 氢冶金 富氢碳循环氧气高炉 氢基竖炉 

分 类 号：TF55[冶金工程—钢铁冶金]