摘要
采用MS2000激光粒度仪分析了电厂炉前煤粉粒度分布特征,磨煤造成了显微组分的分离与富集,镜质组有向粗粒度富集的趋势,惰质组有向细粒度富集的趋势.较粗粒径煤粉(212μm^75μm)特别是212μmn^150μm粒度段所占比例对炉内煤粉燃烧效率的影响最大.虽然镜质组有向粗粒度富集的趋势,但最粗粒煤粉因颗粒太粗,在炉内短暂加热时间内来不及迅速燃烧;而较细粒煤粉则因磨煤引起惰质组向细粒度富集而影响其燃烧效率.所以,在理论分析和实验研究粒度对煤粒燃烧特性的影响时,应考虑磨煤造成的显微组分分离与富集所引入的干扰和煤自身煤岩特征的差异.
The size distribution characteristic of pulverized coal in coal-fired power plant was analyzed with master sizer （MS2000）. Coal grinding has resulted in the separating and enrichment of macerals. Vitrinite has an enrichment trend to the particles with a litter bigger size contrarily inertinite is enriched in the particles with smaller size. The percentage of big coal particles （212 μm-75 μm） in pulverized coal seriously effects coal combustion efficiency, particularly to the particles from 212 μm to 150 μm in size. Although vitrinite tend to enrich in the particles with big size,the biggest coal particles in boiler are too big to rapidly combust within the short heating time. On the other hand ,to the coal particles with some smaller size ,the enrichment of inertinite results in a negative effect on combustion efficiency. Therefore, either in theory analysis or in experimental study on the coal combustion character,it is needed to consider the infection of the enrichment and separating of macerals while grinding coal and the difference of coal in petrographic characteristics.
出处
《煤炭转化》
CAS
CSCD
北大核心
2006年第3期58-61,共4页
Coal Conversion
关键词
煤粉
粒度
燃烧效率
显微组分
电厂
pulverized coal ,size,combustion efficiency, maceral ,coal-fired power plant
