摘要
采用在线取样方法,对高炉风口平面径向不同位置焦炭进行取样。对其沿径向以0.5 m为单位分段,通过粒度筛测、XRD、扫描电镜和BET等手段对比研究各分段焦炭的渣铁含量、粒级分布、比表面积与微观结构。结果表明:风口区域渣铁含量沿炉壳向炉芯的方向呈增大趋势,同时发现各径向焦炭的平均粒度呈下降趋势;与入炉焦相比,风口焦微晶结构更有序,但其在不同分段差异显著,在1~2 m区间内的风口焦有序化程度最高,说明风口区域温度最高;同时风口焦比表面积和微孔孔容分布明显高于入炉焦,且径向焦炭微孔孔径主要集中在2~5 nm,因而为有效减缓焦炭劣化速度,需考虑入炉焦的气孔均匀度。
The on-line sampling method was used to sample coke at different radial positions of the blast furnace tuyere plane.The slag iron content,particle size distribution,specific surface area and microstructure of each segmented coke were comparatively studied by means of particle size screening,XRD,scanning electron microscope and BET.The results show that the content of slag and iron in the tuyere area increases along the direction from the furnace shell to the furnace core,and the average particle size of coke in each radial direction is found to decrease;However,there are significant differences in different subsections.The tuyere coke has the highest degree of order in the 1~2 m range,indicating that the temperature in the tuyere area is the highest at this position.At the same time,the specific surface area and micropore volume distribution of the tuyere coke are significantly better than those of the furnace coke.And the radial coke micropore diameter is mainly concentrated in 2~5 nm,so in order to effectively slow down the coke deterioration speed,it is necessary to consider the pore uniformity of the coke entering the furnace.
作者
常生朝
杨佳龙
尤胜强
杨建
吴宏亮
CHANG Shengzhao;YANG jialong;YOU shengqiang;YANG jian;WU hongliang(School of Metallurgical Engineering,Anhui University of Technology;Maanshan Iron&Steel Co.,Ltd.,maanshan 243000,Anhui,China)
出处
《冶金动力》
2022年第3期1-5,28,共6页
Metallurgical Power
基金
纯氧高炉炼铁与煤气化耦合联产工艺技术基础研究(U1860113)。
关键词
高炉
风口焦
入炉焦
粒度分布
微观结构
blast furnace
tuyere coke
furnace coke
particle size distribution
microstructure
