Temporally and spatially resolved study of laser-induced plasma generated on coals with different volatile matter contents

被引:80
作者
Cai, Junbin [1 ,2 ]
Dong, Meirong [1 ,2 ]
Zhang, Yongsheng [1 ,2 ]
Chen, Yixiang [1 ,2 ]
Liang, Youcai [1 ,2 ]
Lu, Jidong [1 ,2 ]
机构
[1] South China Univ Technol, Sch Elect Power, Guangzhou 510640, Guangdong, Peoples R China
[2] Guangdong Prov Engn Res Ctr High Efficient & Low, Guangzhou 510640, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Temporal-spatial resolved LIBS; Coal; Volatile matter content; Spectra; Plasma; INDUCED BREAKDOWN SPECTROSCOPY; PULVERIZED COAL; ELEMENTAL ANALYSIS; ORGANIC-COMPOUNDS; CARBON; LIBS; ABLATION; C-2; EVOLUTION; GRAPHITE;
D O I
10.1016/j.sab.2021.106195
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Volatile matter content is one of the important characteristics of coal, which would inevitably influence the lasercoal interaction process. In this work, the coal samples with different volatile matter contents were carried out by laser induced breakdown spectroscopy (LIBS) in argon atmosphere. The temporal and spatial evolution of spectra was captured along with the plasma evolution to investigate the mechanism of the volatile matter effects. The results showed that the spectral emissions for the species that abundant in volatile matter were intense at the plasma front, which indicated that the volatile matter vaporized preferentially as laser irradiating and pushed toward the upper part of the plasma. The distribution characteristics of the atomic carbon emission and ionic calcium emission of different coals demonstrated that the amount of vaporization increased with the volatile content. The more abundant dissociated volatile matter in the plasma plume benefited the generation of molecular carbon (CN and C2) formed by several pathways, resulting in an enhancement on the corresponding emissions. Moreover, effects of volatile content on ablation process contributed to the difference in plasma structure and composition, which would be magnified during the plasma expansion and fluctuation process, contributing to greatly diverse plasma morphology and parameter distribution. Consequently, a conceptual lasercoal interaction model was proposed based on the comprehensive analysis of the measurements to describe the initiation and propagation of the effects of volatile matter on coal plasma.
引用
收藏
页数:12
相关论文
共 65 条
[1]   Dynamics of C2 formation in laser-produced carbon plasma in helium environment [J].
Al-Shboul, K. F. ;
Harilal, S. S. ;
Hassanein, A. ;
Polek, M. .
JOURNAL OF APPLIED PHYSICS, 2011, 109 (05)
[2]  
[Anonymous], 2020, BP STAT REV WORLD EN
[3]   Classification of polymers by determining of C1:C2:CN:H:N:O ratios by laser-induced plasma spectroscopy (LIPS) [J].
Anzano, Jesus ;
Lasheras, Roberto-Jesus ;
Bonilla, Beatriz ;
Casas, Justiniano .
POLYMER TESTING, 2008, 27 (06) :705-710
[4]   Time-resolved ultraviolet laser-induced breakdown spectroscopy for organic material analysis [J].
Baudelet, Matthieu ;
Boueri, Myriam ;
Yu, Jin ;
Mao, Samuel S. ;
Piseltelli, Vincent ;
Mao, Xianglei ;
Russo, Richard E. .
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2007, 62 (12) :1329-1334
[5]  
Bauerle D., 2000, ADV TEXTS PHYS
[6]   Optimization of the spectral data processing in a LIBS simultaneous elemental analysis system [J].
Body, D ;
Chadwick, BL .
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2001, 56 (06) :725-736
[7]   In situ determination of sulphur in coal seams and overburden rock by PGNAA [J].
Borsaru, M ;
Berry, M ;
Biggs, M ;
Rojc, A .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2004, 213 :530-534
[8]   The application of prompt-gamma neutron activation analysis to borehole logging for coal [J].
Borsaru, M ;
Biggs, M ;
Nichols, W ;
Bos, F .
APPLIED RADIATION AND ISOTOPES, 2001, 54 (02) :335-343
[9]   Considerations on formation mechanisms of emitting species of organic and C-containing inorganic compounds in CO2 atmosphere using laser-induced breakdown spectroscopy as a strategy for detection of molecular solids [J].
Cabalin, L. M. ;
Delgado, T. ;
Garcia-Gomez, L. ;
Laserna, J. J. .
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2020, 169
[10]   Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy [J].
Chen, Mengyuan ;
Yuan, Tingbi ;
Hou, Zongyu ;
Wang, Zhe ;
Wang, Yun .
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2015, 112 :23-33