《工程科学学报》录用稿，htps:/doi.org/10.13374/i,issn2095-9389.2020.11.30.002©北京科技大学2020 工程科学学报DO: 生物质炭复合团块在高炉中的反应行为 张壮壮，王强，唐惠庆网，薛庆国 北京科技大学，钢铁治金新技术国家重点实验室，北京：100083 通讯作者：唐惠庆，电子邮件：hqtang@ustb.edu.cn 精妻高炉炼铁联合转炉炼钢是生产钢铁的最主要工艺，在此生产过程中，高炉炼铁释感大量的二氧化碳。生物质炭 是一种可再生能源，在高炉内加装生物质复合团块是将生物质引入高炉的一种简便方法，/是降低高炉CO排放的有效措施。 本文研究了生物质复合团块在高炉中的反应行为，该复合团块主要成分为：11.1wt哈C2Jw嘘%FeO4、11.25wt%FO、 0.77wt%F和4.67wt.%脉石。并对高炉环境下复合团块的反应行为进行了建模，通过炉饩氛下的等温动力学实验确定模 型参数并进行了模型验证。进一步，结合模型模拟，模拟高炉环境的实验和团块赏观结构分析，对模拟高炉条件下和实际高 炉条件下团块的反应行为进行了分析。研究结果表明：模拟高炉条件下，在60min973K)到120min(1273K)期间，团块 的微观结构发生明显变化，其微观结构由渣相网络结构向金属铁网络结构转变。在实际高炉中，复合团块的反应进程主要包 括三个阶段：团块的高炉煤气还原(473-853K)、团块的高炉煤气还原刮部分自还原(853-953K)以及团块的完全自还原 (953-1150K)。在团块自还原参与阶段，与烧结矿相比，团块的铁还原速率更快：与焦炭相比，团块内生物质炭气化 速率更高。同时，在此阶段，团块有提高高炉煤气利用率和降低高分熟储备区温度的作用。 关键词：生物炭；复合团块；高炉炼铁；反应模型； 反 Reaction Behavior of Biochar Composite Briquette in Blast Furnace ZHANG Zhuang-zhuang,WANG Qiang /TANG Hui-qing,XUE Qing-guo 1) State Key Laboratory of Advan ence and Technology Beijing,Beijing,100083,China Correspondence:hqtang @ustb.edu. ABSTRACT Blast furnace(BP)ironmaking is considered to be the most popular technology to meet the increasing steel demand worldwide but it is responstble for the most CO2 emissions in the blast furnace-basic oxygen furnace production process.The utilization of biomass/biochar i B ronmaking is an effective countermeasure to reduce its CO2 emission as biomass/biochar is a renewable carbon source and environment neutron.Charging biochar composite briquette(BCB)is expected to a convenient method to introduce biomass/biochar into BF.In the present research,the reaction behavior of BCB in BF was investigated.The biochar composite briquette (BCB)for BF was prepared using cold briquetting followed by low-temperature heat treatment.The BCB was composed of 11.1 wt.% carbon,72.7 wt%magnetite,11.25 wt%wustite,0.77 wt.%metallic iron,and 4.67 wt.%gangue,The BCB reaction model in BF for BF was developed consideration of the step-wise gaseous reduction of iron-oxide particles,the COz gasification of biochar particles,the internal gas diffusion in the BCB,and the mass transfer between the BCB and the environment.The isothermal BCB reaction tests were conducted for model validation.Using the model,the change of BCB iron-oxide reduction fraction,the change of BCB biochar conversion,and the BCB microstructure evolution under simulated BF conditions were analyzed.The model was also applied to predict the change of BCB iron-oxide reduction fraction,the change of BCB biochar conversion,the change of BCB CO generating rate,and 收稿日期：2020-XX-XX 基金项目：国家自然科学基金资助项目(U1960205)工程科学学报 DOI: 收稿日期:2020-XX-XX 基金项目:国家自然科学基金资助项目(U1960205) 生物质炭复合团块在高炉中的反应行为 张壮壮，王强，唐惠庆，薛庆国 北京科技大学，钢铁冶金新技术国家重点实验室，北京：100083 通讯作者：唐惠庆，电子邮件：hqtang@ustb.edu.cn 摘 要 高炉炼铁联合转炉炼钢是生产钢铁的最主要工艺，在此生产过程中，高炉炼铁释放出大量的二氧化碳。生物质炭 是一种可再生能源，在高炉内加装生物质复合团块是将生物质引入高炉的一种简便方法，是降低高炉 CO2排放的有效措施。 本文研究了生物质复合团块在高炉中的反应行为，该复合团块主要成分为：11.1 wt.% C、72.7 wt.% Fe3O4、11.25 wt.% FeO、 0.77 wt.% Fe 和 4.67wt.% 脉石。并对高炉环境下复合团块的反应行为进行了建模，通过高炉气氛下的等温动力学实验确定模 型参数并进行了模型验证。进一步，结合模型模拟，模拟高炉环境的实验和团块微观结构分析，对模拟高炉条件下和实际高 炉条件下团块的反应行为进行了分析。研究结果表明：模拟高炉条件下，在 60 min (973 K) 到 120 min (1273 K) 期间， 团块 的微观结构发生明显变化，其微观结构由渣相网络结构向金属铁网络结构转变。在实际高炉中，复合团块的反应进程主要包 括三个阶段：团块的高炉煤气还原（473-853 K）、团块的高炉煤气还原和部分自还原（853-953 K）以及团块的完全自还原 （953-1150 K）。在团块自还原参与阶段，与烧结矿相比，团块内氧化铁还原速率更快；与焦炭相比，团块内生物质炭气化 速率更高。同时，在此阶段，团块有提高高炉煤气利用率和降低高炉热储备区温度的作用。 关键词：生物炭；复合团块；高炉炼铁；反应模型；反应行为 Reaction Behavior of Biochar Composite Briquette in Blast Furnace ZHANG Zhuang-zhuang 1) , WANG Qiang 1) , TANG Hui-qing 1)  , XUE Qing-guo 1) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China  Correspondence: hqtang@ustb.edu.cn ABSTRACT Blast furnace (BF) ironmaking is considered to be the most popular technology to meet the increasing steel demand worldwide but it is responsible for the most CO2 emissions in the blast furnace-basic oxygen furnace production process. The utilization of biomass/biochar in BF ironmaking is an effective countermeasure to reduce its CO2 emission as biomass/biochar is a renewable carbon source and environment neutron. Charging biochar composite briquette (BCB) is expected to a convenient method to introduce biomass/biochar into BF. In the present research, the reaction behavior of BCB in BF was investigated. The biochar composite briquette (BCB) for BF was prepared using cold briquetting followed by low-temperature heat treatment. The BCB was composed of 11.1 wt.% carbon, 72.7 wt.% magnetite, 11.25 wt.% wustite, 0.77 wt.% metallic iron, and 4.67 wt. % gangue, The BCB reaction model in BF for BF was developed consideration of the step-wise gaseous reduction of iron-oxide particles, the CO2 gasification of biochar particles, the internal gas diffusion in the BCB, and the mass transfer between the BCB and the environment. The isothermal BCB reaction tests were conducted for model validation. Using the model, the change of BCB iron-oxide reduction fraction, the change of BCB biochar conversion, and the BCB microstructure evolution under simulated BF conditions were analyzed. The model was also applied to predict the change of BCB iron-oxide reduction fraction, the change of BCB biochar conversion, the change of BCB CO generating rate, and 《工程科学学报》录用稿，https://doi.org/10.13374/j.issn2095-9389.2020.11.30.002 ©北京科技大学 2020 录用稿件，非最终出版稿