摘要
为了探究焦粉、兰炭替代无烟煤进行喷吹对混煤燃烧的影响,使用新型高炉喷煤燃烧模拟试验装置与热重分析设备,研究了焦粉、兰炭以及混煤粒度对混煤燃烧的影响。利用扫描电镜(SEM)与能谱仪(EDS)观察了未燃煤粉的外观形貌。研究结果表明,粒度降低对燃烧有促进作用,焦粉用于喷吹的粒度应低于0.074mm;兰炭替代无烟煤没有明显影响,而焦粉作用明显;当焦粉添加量超过15%时,混煤燃烧性能急剧下降。兰炭与焦粉对混煤燃烧性的影响不同,主要原因是兰炭与焦粉具有不同的化学性能与结构。从混煤燃烧性能的角度考虑,少量焦粉替代无烟煤用于高炉喷吹是可以被接受的。
In order to explore the effect of injection of coke and semi-coke instead of anthracite on the combustion of blended coal,using the new blast furnace coal injection combustion simulation experimental device and thermogravimetric analysis equipment,the effects of coke powder,semi-coke and coal blending particle size on the combustion of blended coal were studied.The appearance of unburned coal powder was observed by scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).The mechanism and influencing factors of coal blending combustion were analyzed from the perspective of the coal powder combustion process and coal structure.The results show that the particle size reduction has a promoting effect on combustion.The particle size of coke powder used for injection should be less than 0.074 mm.Semi-coke and coke powder have different effects on coal blending,semi-coke has no obvious effect on the replacement of anthracite,but the effect of coke powder is obvious.When the amount of coke powder added exceeds 15%,the combustion performance of the blended coal decreases sharply.The effect of semi-coke and coke breeze on the combustibility of blended coal is different,mainly because of the different chemical properties and structures of semi-coke and coke.Considering the combustion performance of blended coal,it is acceptable to use a small amount of coke powder instead of anthracite for the blast furnace injection.
作者
彭政富
张建良
毕传光
宁晓钧
谭培龙
王广伟
PENG Zheng-fu;ZHANG Jian-liang;BI Chuan-guang;NING Xiao-jun;TAN Pei-long;WANG Guang-wei(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Technology Center,Shanghai Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,Jiangsu,China)
出处
《钢铁》
CAS
CSCD
北大核心
2019年第12期10-18,共9页
Iron and Steel
关键词
高炉喷煤
燃烧率
混煤燃烧
焦粉
blast furnace coal injection
combustion rate
mixed coal combustion
coke powder