State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan, P R China.
Appl Spectrosc. 2011 Jul;65(7):790-6. doi: 10.1366/10-06213.
The level of unburned carbon in fly ash is an important criteria for evaluating the combustion efficiencies of boilers, as well as the commercial value of the produced fly ash. In this work, an automated prototype laser-induced breakdown spectroscopy (LIBS) apparatus comprising an isokinetic sampler, a sample preparation module, and a LIBS module has been developed for possible application to power plants for on-line analysis of unburned carbon in fly ash without being affected by the type of coal burned. Emphasis is placed on the structure and operation of the LIBS apparatus, the optimum suction capacity selection, the analytical methods for estimation of the exact C line intensity, and the proper calibration model established for minimizing the matrix effects, which enable the minimization of matrix effects and obtaining more accurate compositional measurements. Good agreement has been found between the laboratory measurement results from the LIBS method and those from the traditional method. The measurement accuracy presented here for unburned carbon analysis is estimated to be 0.26%, while the average relative error is 3.81%.
飞灰中未燃烧碳的含量是评估锅炉燃烧效率以及飞灰商业价值的一个重要标准。在这项工作中，开发了一种自动化的激光诱导击穿光谱（LIBS）原型仪器，包括等速采样器、样品制备模块和 LIBS 模块，可用于发电厂在线分析飞灰中的未燃烧碳，而不受所燃烧煤种的影响。重点介绍了 LIBS 仪器的结构和操作、最佳抽吸能力的选择、用于估算精确 C 线强度的分析方法以及为最小化基体效应而建立的适当校准模型，这些措施可使基体效应最小化，并获得更准确的成分测量结果。LIBS 方法的实验室测量结果与传统方法的测量结果之间具有良好的一致性。这里提出的未燃烧碳分析的测量精度估计为 0.26%，平均相对误差为 3.81%。
