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我国电站入炉煤种复杂多变,实时快速获取煤质成分对保障锅炉的安全、高效、低污染运行具有重大意义。将激光诱导击穿光谱(LIBS)技术应用于燃煤煤质测量,观测了不同波长激光(355,532和1 064nm)诱导产生的等离子体时间演变特性和不同电离特性元素的谱线时间特性,对比了出现屏蔽效应时的能量阈值随激光波长的变化特征,并研究了激光波长对煤LIBS光谱特性的影响规律。结果发现:使用532nm激光作为激发光源时,煤LIBS光谱具有最强的谱线信号强度,且出现等离子体屏蔽效应的能量阈值也较高,是一种较理想的激发光源,为LIBS技术在煤质测量领域的工业应用提供了实验依据。
China’s power station into the furnace complex and volatile coal, real-time rapid access to coal quality components to protect the boiler safe, efficient and low pollution operation is of great significance. The laser-induced breakdown spectroscopy (LIBS) technique was applied to the measurement of coal-fired coal quality. The temporal evolution characteristics of plasmas generated by different wavelength lasers (355, 532 and 1064 nm) and the spectral line time characteristics of different ionization characteristic elements were compared The energy threshold with the shielding effect changes with laser wavelength, and the influence of laser wavelength on the spectral characteristics of coal LIBS has been studied. The results show that the LIBS spectrum of coal has the strongest signal intensity when using 532nm laser as excitation source, and the energy threshold of plasma shielding effect is also higher, which is an ideal excitation light source. The field of mass measurement provides an experimental basis for industrial applications.