【作者】 毕学工； 李鹏； 刘威； 张慧轩； 周进东； 史世庄；

【Author】 Bi Xuegong;Li Peng;Liu Wei;Zhang Huixuan;Zhou Jindong;Shi Shizhuang;State Key Laboratory for Refractory Materials and Metallurgy, Wuhan University of Science and Technology;Key Laboratory for Coal Conversion and Advanced Carbon Materials of Hubei Province,Wuhan University of Science and Technology;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology;

【机构】 武汉科技大学耐火材料与冶金国家重点实验室； 中冶南方； 武汉科技大学煤转化与先进炭素材料湖北省重点实验室；

【摘要】 弄清铁焦受碱金属影响的气化行为对其实际应用于高炉非常重要。本文中,通过将试样在K₂CO₃水溶液中浸泡和煮沸把钾引入铁焦,焦炭失重随时间的变化用热重法测定,用粒焦法测定焦炭的反应性和反应后强度,并基于收缩核模型（SCM）对气化反应机理进行分析。研究证明钾对铁焦气化有催化作用,表现为使其气化开始温度和反应活化能降低。与传统焦炭比较,当加入K₂O时,铁焦的反应性指数增大而反应后强度变小,而且当加入相等数量的K₂O时,铁焦的这两个指标的变化趋势和传统焦炭相同,但变化幅度比传统焦炭稍微大一些。与传统焦炭的另一不同之处是,当温度从950℃提高到1050℃而且气化率不超过50%的时候,铁焦的反应始终是化学反应和内扩散的混合控制。更多还原

【Abstract】 To clarify the behavior of its gasification affected by alkalis is very important for its practical use in blast furnace. In this paper, potassium was added to sample by soaking and boiling it in K₂CO₃ aqueous solution, the variation of coke weight loss vs time was measured with the thermogravimetry approach, the Tablets Coke Method was applied for measurement of the reactivity and post-reaction strength of cokes, and the gasification reaction mechanism was analyzed based on the Shrinking-Core Model（SCM）. This work demonstrated that potassium had a catalytic effect on ferro-coke gasification in terms of a decrease in the starting reaction temperature and reaction activation energies. In comparison with traditional coke, when no K₂O was added, the reactivity index of ferro-coke was higher and the post-reaction strength index of ferro-coke was lower, while as a same amount of K₂O was added and in respect to these two indices, the direction of variation of ferro-coke was the same and the extent of variation of ferro-coke was slightly higher. Different from traditional coke, when temperature ranges from 950℃ to 1050℃ and the degree of burning-off is within 50%, the reaction of ferro-coke is always mixed controlled by chemical reaction and inner diffusion.更多还原