Ultra-repeatability measurement of the coal calorific value by XRF assisted LIBS
Ultra-repeatability measurement of the coal calorific value by XRF assisted LIBS
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XRF辅助LIBS超重复性测量煤炭发热量
DOI：
10.1039/d0ja00362j
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发表时间：
2020-12
影响因子：
3.4
通讯作者：
SUO TANG JIA
中科院分区：
文献类型：
--
作者：
Xiaolin Li;lei zhang;Zhihui Tian;Wei Guang Ma;Lei Dong;Wangbao Yin;LIAN TUAN XIAO;SUO TANG JIA
煤的发热量主要取决于可燃有机元素和灰分的含量，是煤质的综合指标。快速获取进入锅炉的煤的热值，对于火力发电配煤和燃烧的优化控制具有重要意义。然而，LIBS对煤热值的测量重复性尚未达到中国国家标准中标准偏差（SD）小于120 J g−1的要求。本文创新性地提出了一种XRF辅助LIBS分析方法，不仅可以用LIBS分析可燃有机轻元素，还可以用XRF分析无机成灰元素，稳定性高，从而大大提高了煤热值测量的可重复性。根据强度的稳定性，合理选择LIBS和XRF光谱中的元素发射谱线，并通过主成分分析和多元回归建立预测模型。实验结果表明，预测的煤热值SD为72 J g−1，比传统LIBS的700 J g−1低一个数量级，完全满足国家标准的要求。发现热值的测量不稳定性主要来自于C线的贡献，通过光谱筛选可以进一步降低热值的SD至56 J g−1。这种xrf辅助LIBS技术具有超重复性，有望应用于电厂、煤化工等需要密切关注煤质的工业领域。
The calorific value of coal mainly depends on the content of combustible organic elements and ash, and is a comprehensive indicator of coal quality. It is of great significance to quickly obtain the calorific value of coal entering the boiler for the optimal control of coal blending and combustion in thermal power generation. However, the measurement repeatability of LIBS for the coal calorific value has not yet met the requirement of a standard deviation (SD) of less than 120 J g−1 in the Chinese national standard. This paper innovatively proposes an analytical method of XRF-assisted LIBS, which can not only analyze the combustible organic light elements by LIBS, but also can analyze the inorganic ash-forming elements by XRF with high stability, thus greatly improving the measurement repeatability of the coal calorific value. According to the stability of intensity, the elemental emission lines in the LIBS and XRF spectra are selected reasonably, and the prediction model is established through principal component analysis and multiple regression. The experimental results show that the SD of coal calorific values predicted is 72 J g−1, which is one order of magnitude lower than the 700 J g−1 of traditional LIBS, and fully meets the requirement of the national standard. It is found that the measurement instability of the calorific value mainly comes from the contribution of the C line, and the SD of the calorific value can be further reduced to 56 J g−1 by means of spectral screening. This XRF-assisted LIBS technology with ultra-repeatability is expected to be applied in power plants, coal chemical industries and other industrial fields that need to pay close attention to coal quality.
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