摘要
双碳背景下,以生物质为原料制备生物炭代替煤基炭,用于钢铁行业烧结烟气低温脱硝成为研究热点。以生物质为原料,通过单因素实验考察硝酸氧化、Mn掺杂量、粘结剂添加、活化条件对材料性能的影响,制备得到机械强度达标、脱硝效率高和催化稳定性好的Mn掺杂多孔炭基复合功能材料,并通过一系列表征初步探究材料组成、结构与低温脱硝活性之间的构效关系。结果表明,以硝酸氧化后的玉米秸秆生物炭为载体,掺杂活性组分Mn,添加混合粘结剂辅以水蒸气活化得到综合性能最佳的复合功能材料,在低温(120℃)脱硝活性测试中NO的稳态去除率达66.4%,是煤基活性炭的7倍左右,在模拟湿烟气工况下脱硝活性也显著高于煤基活性炭。研究成果为钢铁行业烧结烟气低温SCR脱硝提供了一种新的思路。
Under the background of"Dual Carbon Goal",the preparation of biochar using biomass as the raw material instead of coal-based carbon for low-temperature denitrification of sintering flue gas in iron and steel industry has become a research hotspot.In this paper,using biomass as raw material,the effects of nitric acid oxidation,Mn doping amount,binder addition and activation conditions on material properties were investigated through single-factor experiments,and Mn-doped porous carbon matrix composite functional materials with the required mechanical strength,high denitrification efficiency and good catalytic stability were prepared.Moreover,the structure-activity relationship between material composition,structure and low-temperature denitrification activity was initially explored through a series of characterization.The results showed that the composite functional material with the best comprehensive properties was obtained by doping the active component Mn with the addition of mixed binder and water vapor activation.The steady-state removal rate of NO at low temperature(120℃)was 66.4%,which was about 7 times that of the coal-based activated carbon.The denitrification activity was also significantly higher than that of coal-based activated carbon under simulated wet flue gas conditions.The research results provide a new idea for the low-temperature SCR denitrification of sintering flue gas in iron and steel industry.
作者
刘一玮
李本行
魏子章
刘肖瑶
何旭
梁高磊
马小东
LIU Yiwei;LI Benhang;WEI Zizhang;LIU Xiaoyao;HE Xu;LIANG Gaolei;MA Xiaodong(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Academy of Eco-Environmental Sciences,Tianjin 300191,China)
出处
《环境工程》
CAS
CSCD
2024年第10期112-120,共9页
Environmental Engineering
基金
国家重点研发计划课题(2020YFC1808603)
国家自然科学基金项目(22106037,21876042,22106036)
河北省重点研发计划项目(B2019202200,21374204D,22374206D)。
关键词
MN掺杂
多孔生物炭
NH3选择性催化还原
低温脱硝
烧结烟气
Mn-doping
porous biochar
NH3-selective catalytic reduction
low temperature denitrification
sintering flue gas
