挥发分喷射对碳烟生成和火焰辐射的影响

摘要

利用激光诱导白炽光和增强型CCD拍照研究了煤燃烧中挥发分喷射对碳烟体积分数和火焰辐射强度的影响.结果表明:煤燃烧挥发分喷射会导致碳烟的大量生成以及碳烟分布位置的急剧变化,碳烟体积分数的最大值能从120x10-6增加到170x10-6,甚至更高.煤燃烧时挥发分喷射会对火焰辐射产生显著的影响,辐射的总体强度和最大值会突然出现显著的增加.模型分析表明,喷射是挥发分集中在一个较窄通道释放而形成,而不是挥发分经过时间累积之后集中释放.%The effects of volatile matter ejection on soot formation and flame radiation during coal combustion were quantitatively investigated by LII (laser induced incandescence) and ICCD (intensified CCD) photograph. The results show that the ejection enhances soot formation and changes the soot distribution. The maximum soot volume fraction around coal particle rises from 120X 10-6 to 170X10-6 when the ejection occurs. The ejection of volatile matter has an immense effect on the flame radiation, resulting in a huge increase on the flame radiation. The results show that the ejection is attributed to the concentrated release of volatile matter via a narrow path through the particle rather than the time integration of volatile matter in paticle.