CO_(2)和H_(2)O对焦炭强度及微观结构的影响  

Influence of CO_(2) and H_(2)O on Coke Strength and Microstructure

作　　者：马腾飞 倪静峰 郑海燕 丁智敏 潘向阳 张国鹏 王硕 沈峰满 MA Tengfei;NI Jingfeng;ZHENG Haiyan;DING Zhimin;PAN Xiangyang;ZHANG Guopeng;WANG Shuo;SHEN Fengman(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;No.2 Ironmaking Plant,Lingyuan Iron and Steel Co.,Ltd.,Lingyuan 122500,Liaoning,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]凌源钢铁股份有限公司第二炼铁厂,辽宁凌源122500

出　　处：《炼铁》2023年第4期57-62,68,共7页Ironmaking

基　　金：国家自然科学基金资助项目(NSFC52274322,NSFC52074072,NSFC51974073)。

摘　　要：高炉喷吹富氢燃料是减少碳排放的有效措施之一,但喷吹富氢燃料产生的H_(2)O会造成焦炭的劣化。对比分析了不同温度下焦炭与CO_(2)和H_(2)O反应过程中,焦炭强度、两者的交互作用及微观结构的变化。分析结果表明:与H_(2)O反应溶损率SLR约为与CO_(2)反应SLR的2~5倍,温度升高,二者SLR差距缩小;焦炭反应后强度CSR随着温度的升高而降低,且SLR与CSR呈现负相关性;当H_(2)O/CO_(2)>1时,焦炭与CO_(2)-H_(2)O反应产生明显的交互作用;无论是焦炭与CO_(2)还是与H_(2)O发生溶损反应,微观形貌均表现为边缘部位溶损更严重;相比与CO_(2)反应,焦炭与H_(2)O反应在边缘更为剧烈,但内部气孔破坏较小。Hydrogen-enriched fuel injection is one of the effective measures to reduce CO_(2) emission from the blast furnace,but H_(2)O generated from the injection of hydrogen-enriched fuel will cause the degradation of coke.The changes of coke strength and coke microstructure during the reaction process of coke with CO_(2)and H_(2)O at different temperatures and the in-teraction of the coke with CO_(2)and H_(2)O were compared and investigated.The analysis resultindicates that the solution loss rate(SLR)of coke reaction with H_(2)O is about 2-5 times that of reaction with CO_(2),and the SLR difference between them narrowswhen the temperature increases.The coke strength after reaction(CSR)decreases with the increase of temperature,and SLR is negatively correlated with CSR.When H_(2)O/CO_(2)>1,the reaction between coke and CO_(2)-H_(2)O leads to signifi-cant interaction.The microscopic morphology shows that the solution loss of coke at the edge is more severe no matter the solution loss occurs when reacting with CO_(2)or H_(2)O.However,compared with the reaction with CO_(2),coke reacts with H_(2) O more violently at the edge of the coke,but the damage of internal gas pores is less.

关 键 词：富氢喷吹 焦炭劣化 气化溶损 微观形貌 

分 类 号：TF538.6[冶金工程—钢铁冶金]