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针对燃煤组分分布不均匀的特性,研究不同收光模式对激光诱导击穿光谱技术同步测量灰成分的影响。选用具有不同灰成分含量梯度的燃煤样品作为检测对象,对比分析同向收光和侧向收光下灰成分组成元素谱线信号探测的强度和稳定性及SiO2、Al2O3、Fe2O3、CaO、MgO和TiO2含量定量分析的精确度。研究结果表明,相同实验条件下同向收光模式的光谱信号稳定性和定量分析精确度更好,检验样品中各灰成分的预测值和参考值之间的拟合度均在0.986以上。而侧向收光模式下探测到的光谱信号强度更强,光谱探测下限可以达到190nm。
In view of the uneven distribution of coal combustion components, the effects of different light-receiving modes on the simultaneous measurement of ash content by laser-induced breakdown spectroscopy were studied. Coal samples with different ash content gradients were selected as test objects to analyze the intensity and stability of signals detected by spectral line composition of ash components in the same direction and lateral direction and the influence of SiO2, Al2O3, Fe2O3, CaO, MgO And TiO2 content of the quantitative analysis of the accuracy. The results show that under the same experimental conditions, the spectral signal stability and quantitative analysis accuracy of the co-directional light absorption mode is better. The fitting degree between the predicted value and the reference value of each ash component in the test sample is above 0.986. However, the spectral signal intensity detected in the lateral light-receiving mode is stronger, and the lower limit of spectral detection can reach 190 nm.