典型钢铁生产流程烟气中CO减排研究进展  

Research progress of CO removal in flue gas of typical steel production process

作　　者：龙红明 丁龙 赵贺喜 康建刚[3] 春铁军 钱立新 LONG Hongming;DING Long;ZHAO Hexi;KANG Jiangang;CHUN Tiejun;QIAN Lixin(School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Maanshan 243002,Anhui,China;Engineering Technology Research Center,MCC Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002 [3]中冶长天国际工程有限责任公司工程技术研究中心,湖南长沙410205

出　　处：《钢铁》2023年第8期1-12,24,共13页Iron and Steel

基　　金：国家自然科学基金资助项目(52174290,52204332)。

摘　　要：CO对人体和环境具有毒性,是六大标准大气污染物之一。钢铁生产流程每年向大气中排放大量含有CO的工业尾气。在国家“碳达峰”、“碳中和”发展大背景下,钢铁生产流程正面临着巨大的CO减排压力。总结了典型钢铁生产流程烟气中CO排放现状,向大气中排放CO的烟气包括焦炉烟气、烧结烟气、还原回转窑烟气和转底炉烟气等,这些烟气中CO浓度低,排放总量大。针对烟气中CO减排,总结了国内外在源头控制、过程减排和末端治理等方面的研究进展。其中源头控制技术从能源结构调整角度利用绿色氢能和电能代替化石能源,过程减排主要是改善化石燃料燃烧条件以减少CO排放,末端治理则是通过物理/化学方式将CO从烟气中分离或将其氧化成CO_(2)。末端治理技术中,催化氧化技术具有投资成本低、无额外运行能源消耗和二次污染、减排效果显著等优点,可以与当前钢铁烟气脱硫脱硝技术配合使用,具有工业实践的可行性,但是目前催化剂在抗中毒和制备成本控制方面有待提高。烧结烟气CO减排是目前迫切需要解决的问题,分析了烧结烟气CO减排可行的技术路线及其面临的挑战,提出通过耦合烟气循环、介质喷洒、燃料改进以及催化氧化技术,可以实现低投入、高效率的烧结烟气CO减排目标。CO,one of the six standard air pollutants,is toxic to human body and the environment.The steel industry releases large amounts of industrial tail gas containing CO into the atmosphere every year.Under the background of"carbon peaking"and"carbon neutral",the whole steel industry is facing huge CO emission reduction pressure.The present situation of CO emission from flue gas in typical steel production process was summarized.Continuous emissions included coke oven flue gas,sintering flue gas and rotary kiln flue gas,etc.The CO concentration in these flue gases was low and the flue gas emissions were large.For CO reduction in flue gas,the research works on source control,process reduction and terminal treatment technologies were summarized.Source control refers to replacing fossil energy with environmentally friendly hydrogen and electrical energy.Process reduction focuses on improving fossil fuel combustion conditions to reduce CO emissions.Terminal treatment involves physically/chemically separating CO from the flue gas or oxidizing it to CO_(2).Among the terminal treatment technologies,catalytic oxidation technology has low investment cost,no operational energy consumption and secondary pollution,and significant emission reduction effect.In addition,it can be combined with flue gas desulfurization and denitrification technology and has the possibility of industrial practice,but the current catalysts need to be optimized in terms of anti-poisoning and preparation cost.Finally,according to the CO emission reduction of sintering flue gas is an urgent problem to be solved,the feasible technical routes and challenges for CO emission reduction of sintering flue gas were analyzed.It is suggested that low input and high efficiency CO emission reduction can be achieved by coupling flue gas cycle,medium spraying,fuel improvement and catalytic oxidation technology.

关 键 词：钢铁工业烟气 一氧化碳 减排技术 催化氧化法 催化剂 

分 类 号：TF4[冶金工程—钢铁冶金]