EXPERIMENTAL STUDIES ON THE EMISSION OF PM_(10) AND PM_(2.5) FROM COAL-FIRED BOILER
EXPERIMENTAL STUDIES ON THE EMISSION OF PM_(10) AND PM_(2.5) FROM COAL-FIRED BOILER
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发表时间：
2003
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影响因子：
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通讯作者：
Cen Ke-fa
中科院分区：
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作者：
Cen Ke-fa
采用七级冲击分级机对燃煤锅炉的微细粉尘（飞灰）进行了采样。一个分级器位于除尘器的入口，另一个位于其出口。结果表明，除尘器除尘后，PM10和PM2.5的质量分数分别约为92.47%和35.56%，较除尘前有较大提高。该除尘器对微细粉尘的除尘效率低于普通除尘器，仅为90.6%。总结了煤粉细度、制粉系统运行方式和锅炉负荷是影响粉尘（飞灰）粒度分布的主要因素。研究表明，煤粉越细，飞灰越细。此外，在排风运行下，飞灰变得更细，锅炉负荷的降低可以提高除尘效率。
By using seven-stage impact classifiers, the fine dust(fly ash) from a coal-fired boiler is sampled. One classifier is located in the entrance of dust catcher and another in its exit. The results show that the mass ratios of PM10 and PM2.5 are approximately 92.47% and 35.56% respectively, comparatively higher than that before the dust catcher. Efficiency of the dust catcher for fine dust is lower than that for normal amounts to 90.6% only. It is summarized that the fineness of pulverized coal, the operation mode of pulverizing system and boiler load are the main affecting factors on the size distribution of dust(fly ash). It is known from the study that the finer pulverized coal is, the finer emitted fly ash will be. In addition, the fly ash becomes finer under exhaust air operation, and the reduction of boiler load can improve the dust collection efficiency.