摘要
为了明确高炉富氢冶炼条件下焦炭的气化行为,利用高温模拟试验研究了高炉内φ(H2)对焦炭气化反应和孔隙结构的影响,得到了不同φ(H2)下矿石的还原与焦炭气化反应的关系、焦炭气化最严重的温度区间及焦炭微观孔隙结构的变化。研究结果表明,矿石的还原度和焦炭的失重率在升温过程中都逐渐增加。随着φ(H2)的增加,焦炭的气化率增加幅度最大的温度区间逐渐向低温区移动,主要由于随着φ(H2)的增加,矿石的还原反应逐渐趋向于在低温区进行,使得其在高温区产生的可供焦炭气化反应的CO2和H2O的总量降低;φ(H2)由5%增加至10%时,焦炭的气化率增加幅度最大;随着φ(H2)的增加,焦炭的平均壁厚逐渐降低,孔隙率、比表面积及总孔容都逐渐增加;焦炭大孔所占比例逐渐增加,焦炭气孔壁的薄壁结构所占比例逐渐增加。
In order to clarify the gasification behavior of coke under the condition of hydrogen-rich smelting in the blast furnace,the effect ofφ(H2)on gasification reaction and pore structure of coke were studied by high temperature simulation experiment.The relationships between ore reduction and coke gasification reaction under differentφ(H2),the most serious temperature range of coke gasification and the change of coke micro pore structure were obtained.The results show that the reduction degree of iron ore and the weight loss rate of coke increase gradually during the heating process.The temperature at which the weight loss rate of coke increases the most decreases with increasingφ(H2).The main reason is that with the increase ofφ(H2),the reduction of ore tends to be carried out in the low-temperature zone,which makes the total amount of CO2and H2O produced in the high-temperature zone for coke gasification reduce.When theφ(H2)increases from 5%to 10%,the weight loss rate of coke increases the most.With an increasingφ(H2)in the gas,the average wall thickness of the coke decreases gradually,the porosity,specific surface area and total pore volume increase gradually,the proportion of large pores increases,the proportion of thin-walled structures increases.
作者
兰臣臣
刘然
张淑会
吕庆
LAN Chen-chen;LIU Ran;ZHANG Shu-hui;Lü Qing(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063009,Hebei,China;Ministry of Education Key Laboratory of Modern Metallurgy Technology,North China University of Science and Technology,Tangshan 063009,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2020年第8期100-106,共7页
Iron and Steel
基金
国家自然科学基金资助项目(U1360205,51674122)
河北省自然科学基金资助项目(E2019209424)。
关键词
高炉
H2体积分数
焦炭气化
矿石还原
孔隙结构
blast furnace
H2volume percent
coke gasification
ore reduction
pore structure
