中文摘要：

将激光诱导击穿光谱（LIBS）技术应用于煤粉颗粒流的检测。选用无烟煤、烟煤和褐煤3种燃用特性差异较大的煤样为研究对象，具体分析了不同煤种煤粉颗粒流的等离子体特性。在大气环境下，使用1064nm脉冲激光击穿煤粉颗粒流，并用光谱仪收集等离子信号。通过对等离子体信号的分析，得出煤样颗粒流的Si、Al相对强度、等离子体温度以及电子密度与煤种的关系。实验研究表明，煤粉颗粒流的Si、Al相对强度随灰分含量的增大而增大；各煤种的煤粉颗粒流的等离子体温度和电子密度从大到小排列依次为无烟煤〉烟煤〉褐煤。

英文摘要：

The spectroscopy induced by laser can reflect the characteristics of the sample, In order to apply laser-induced breakdown spectroscopy （LIBS） for the direct detection of coal particles flow, this work presents the experimental analysis on the coal particle flow with the laser-induced breakdown spectroscopy technology. Three kinds of coal samples （anthracite bituminous and lignite） were chosen to explore the plasma characteristics of coal particle flow. The relationships between the characteristics of plasma signal and the sample itself are analyzed. The characteristics of those coal samples are quite different and they are widly used in coal-fire power plant. Samples were ablated by 1 064 nm pulse laser in atmos- phere. Based on the analysis of the plasma signal collected by the spectroscopy, the relations between coal particle flow and the relative line intensity of silicon and aluminum, plasma temperature and electron density are concluded. The analysis results show that the relative line intensity of silicon and aluminum is related to the ash content of the coals and its relative line intensity increases with the increasing of ash content in the coal particle flows. For the plasma temperatures and electron densities of the three kinds of coal samples, the results from large to samll order are achieved, anthracite,bituminous, lignite.