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Development of real-time multi-species laser concentration measurement by standard addition method

标准添加法实时多物种激光浓度测量的研制

基本信息

批准号：
17206018
负责人：
YOSHIKAWA Norihiko
金额：
$ 23.71万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17206018/
关键词：
Thermal Engineering Monitoring Measurement Pollution protection and control

项目摘要

New quantitative laser measurement techniques for combustion exhausts were developed using a standard addition method.1.Laser-Induced Fluorescence(LIF)measurement of nitrogen monoxide(NO)in flames was achieved using a standard addition method. Absorption lines of P_<11>(23.5), P_<21>+Q_<11>(14.5), and Q_<22>+R_<12>(20.5)in A^2Σ^+←X^2 II(0,0) band at 226.03nm were used and the fluorescence intensity of A^2Σ^+←X^2II(0,2)band in 246-248nm were measured. Temperature was determined by two-line method using P_<11>(36.5)line at 225.18 nm and R_<22>(20.5)line at 225.59 nm. Methane-air premixed flames and methane and propane diffusion flames in small burners were examined. The results showed that the new LIF technique provides reliable data. The sampling probe method was not applicable for high temperature combustion gases. The measurement technique was tested for gas turbine exhaust gases. The concentration measu rement gave reliable data. The thermometry was obtained using O<12>(1.5)line at 226.89nm and O^_<12>(19.5)line at 226.90nm line for relatively lower temperature. The selections of the excitation lines were not adequate for getting accurate data.2.A standard addition measurement technique by Laser-Induced Breakdown Spectroscopy(LIBS)was developed for low-concentration elements in solids. The technique was applied to the element detection in coal burnt ashes. Mass fractions of Mn and Cr were obtained. The mass fraction of Mn was 453±17ppm in good agreement with the other chemical analysis data of 464ppm. The Cr concentration was determined 145ppm by saturation curve fitting. The method was also introduced in the measurement of soil contamination. The concentrations of Cd and Pb were 129±12ppm and 28.7ppm, respectively. It was demonstrated that these techniques are viable diagnostic tools in practical use.

1.利用标准加入法实现了火焰中一氧化氮(NO)的激光诱导荧光(LIF)测量。利用A^2Σ^+←X^2 II(0，0)波段的P&lt；11&gt；(23.5)，P_&lt；21&gt；+Q_&lt；11&gt；(14.5)和Q_&lt；22&gt；+R_&lt；12&gt；(20.5)的吸收谱线，测量了A^2Σ^+←X^2II(0，2)带在246-248 nm的荧光强度。温度测定采用双线法，P&lt；11&gt；(36.5)线在225.18 nm处，R&lt；22&gt；(2 0.5)线在225.59 nm处。对甲烷-空气预混火焰、甲烷和丙烷扩散火焰在小型燃烧器中的燃烧进行了研究。结果表明，新的激光诱导荧光技术提供了可靠的数据。取样探针法不适用于高温燃烧气体。对燃气轮机排气测试技术进行了测试。浓度测定提供了可靠的数据。测温采用O&lt；12&gt；(1.5)线(226.89 nm)和O^_lt；12&gt；(19.5)线226.90 nm，温度相对较低。激发谱线的选择不足以获得准确的数据。2.建立了固体中低浓度元素的激光诱导击穿光谱标准加入测量技术。将该技术应用于燃煤灰渣中元素的检测。得到了锰和铬的质量分数。锰的质量分数为453±17ppm，与其它化学分析数据464ppm符合较好。用饱和曲线拟合法测定铬的浓度为145ppm。并介绍了该方法在土壤污染检测中的应用。镉和铅的浓度分别为129±12ppm和28.7ppm。实践证明，这些技术是可行的诊断工具。