摘要
研究不同半焦与喷吹煤粉的燃烧性能有利于半焦进行高炉喷吹、降低炼铁成本。通过改变热解温度、热解升温速率、热解保温时间和热解气氛在管式炉中制备了不同的半焦样品,通过工业分析和热重试验、结合比表面积、发热量和活化能变化对不同热解半焦和两种喷吹煤粉燃烧性能差异进行了分析。结果表明,不同热解条件下制备的半焦,其燃烧性能大多介于两种喷吹煤之间,热解温度是影响半焦反应性能最重要的因素,热解温度对活化能的影响呈现先减小后增大的趋势。不同热解温度制备的半焦孔隙结构均比喷吹煤发达,且累积孔容积和比表面积均呈现先增加后减少的趋势,孔隙特点与燃烧性能基本对应。550℃是制备高反应性半焦较适宜的热解温度。可以通过控制热解条件制备高反应性半焦,这有利于半焦在高炉喷吹中的应用。
Studying the combustion performance of different char and pulverized coal injection is conducive to char injection in the blast furnace and reducing the cost of ironmaking.Different char samples were prepared in a tube furnace by changing the pyrolysis temperature,pyrolysis rate,pyrolysis holding time and pyrolysis atmosphere,and the changes in specific surface area,calorific value and activation energy were measured by proximate analysis and thermogravimetric experiments.The differences in combustion performance between different pyrolysis chars and two kinds of injected pulverized coals were studied.The results show that the combustion performances of chars prepared under different pyrolysis conditions are mostly between two kinds of injected coals,and the pyrolysis temperature is the most important factor affecting the char reaction performance.With the temperature increasing,the activation energy of char during combustion first decreases and then increases.The char pore structures prepared by different pyrolysis temperatures are more developed than the injected coal,and the cumulative pore volume and specific surface area both increase first and then decrease,which is basic correspond to the combustion performance.The temperature of 550℃ is a suitable pyrolysis temperature for the preparation of highly reactive char,which is a benefit to control the pyrolysis conditions to prepare high reactivity char,and it is also conducive to the application of char in the blast furnace injection.
作者
吴浩
邹冲
何江永
王伟安
刘占伟
师帅
WU Hao;ZOU Chong;HE Jiang-yong;WANG Wei-an;LIU Zhan-wei;SHI Shuai(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;Ironw ork,Wuyang Iron and Steel Co.,L td.,Pingdingshan 462500,Henan,China)
出处
《钢铁》
CAS
CSCD
北大核心
2020年第4期12-19,共8页
Iron and Steel
基金
国家自然科学基金资助项目(51704224,51874224)
陕西省重点研发计划资助项目(2017TSCXL-GY-04-01,2015Ktzdsf01-04)
陕西省自然科学基础研究计划青年项目资助项目(2014JQ7282)。
关键词
热分析法
燃烧性能
喷吹煤粉
半焦
thermal analysis
combustion performance
pulverized coal injection
char
