摘要
在保证高炉喷吹煤粉利用率基本不变的条件下,适当放宽高炉喷吹煤粉粒度,可以节省电耗,降低制粉成本,提高磨煤机的台时产量,达到降低炼铁成本的目的。通过实验室对南钢喷吹煤粉的粒度组成和不同粒度煤粉燃烧特性进行研究,确定其放宽粒径的可行性,并在南钢高炉进行放宽煤粉粒径的工业实践,将小于74μm比例从73.43%降至59.47%,同时控制大于355μm的比例不变。通过测定在煤粉粒径放宽前后的利用率可以发现,在高炉生产保持稳定和顺行,原、燃料条件基本不变的条件下,放宽粒径前后煤粉利用率基本上没有大的变化。在进行烟煤和无烟煤混合喷吹的条件下,完全可以降低小于74μm比例,不必采用传统的看法将该比例控制在80%左右,且能够增加磨煤机的产量和降低制粉的能耗。
Under the condition of keeping the utilization of pulverized coal in BF, through relaxing the coal particle size properly to save power consumption, to lower flour milling costs and to improve coal mill production, the purpose of reducing ironmaking cost can be achieved. Size composition and combustion characteristic of pulverized coal injected into BF at Nansteel were analyzed under laboratory condition, and the feasibility of relaxing particle size was discussed. Industrial practice was carried out at Nansteel and the percentage of pulverized coal with its particle size less than 74/~m was reduced from 73.43% to 59.47 %, meanwhile, the ratio of larger than 355/~m was kept. Under the condition of keeping the BF production stability and anterograde and raw material and fuel un- changed, it can be found that before and after relaxing the coal practicle size, pulverized coal utilization basically keep the same. During bituminous coal and anthracite mixed blowing, the proportion of less than 74 8m can be re- duced, there is no need to control the proportion to 80%, then the production of coal mill will be increased, and energy consumption of pulverizing will also be decreased.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2013年第12期8-12,共5页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51274026)
钢铁联合研究基金资助项目(50874129
50934007)
国家高技术研究发展(863)计划资助项目(2009AA06Z105)
关键词
煤粉粒度
燃烧特性
喷煤比
利用率
particle size of pulverized coal
combustion characteristic
pulverized coal injection （PCI） rate
utilization rate
