Optimization of laser-induced breakdown spectroscopy for coal powder analysis with different particle flow diameters

被引：25
作者：
Yao, Shunchun [1 ,2 ]
Xu, Jialong [1 ]
Dong, Xuan [1 ]
Zhang, Bo [1 ]
Zheng, Jianping [1 ]
Lu, Jidong [1 ]
机构：
[1] S China Univ Technol, Sch Elect Power, Guangzhou 510640, Guangdong, Peoples R China
[2] Inst Elect Engn, State Key Lab Pulsed Power Laser Technol, Hefei 230037, Peoples R China
来源：
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2015年 / 110卷
基金：
中国国家自然科学基金;
关键词：
Laser-induced breakdown spectroscopy; Coal particle flow; Tapered tube; Optimization; ELEMENTAL ANALYSIS; LIBS; CARBON; SYSTEM;
D O I：
10.1016/j.sab.2015.06.011
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The on-line measurement of coal is extremely useful for emission control and combustion process optimization in coal-fired plant. Laser-induced breakdown spectroscopy was employed to directly analyze coal particle flow. A set of tapered tubes were proposed for beam-focusing the coal particle flow to different diameters. For optimizing the measurement of coal particle flow, the characteristics of laser-induced plasma, including optical breakdown, the relative standard deviation of repeated measurement, partial breakdown spectra ratio and line intensity, were carefully analyzed. The comparison of the plasma characteristics among coal particle flow with different diameters showed that air breakdown and the random change in plasma position relative to the collection optics could significantly influence on the line intensity and the reproducibility of measurement. It is demonstrated that the tapered tube with a diameter of 5.5 mm was particularly useful to enrich the coal particles in laser focus spot as well as to reduce the influence of air breakdown and random changes of plasma in the experiment. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：146 / 150
页数：5
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