Abstract
Contents of fly ash are important factors for the operation of coal-fired plants. Real-time monitoring of coal and fly ash such as unburned carbon in fly ash can be an indicator of the combustion conditions. Because of the strong signal intensity and the relative simplicity of the LIBS (Laser- Induced Breakdown Spectroscopy) technique, LIBS can be applicable for real-time composition measurement of coal and fly ash. This research presented here focused on the clarification of the effects of plasma temperature and coexisting materials on quantitative measurement of fly ash contents. Quantitative capability of LIBS was improved using the proposed plasma temperature correction method. The CO2 effect was also discussed to accurately evaluate unburned carbon in fly ash in exhausts. Using the results shown in this study, quantitative measurement of fly ash contents has been improved for wider applications of LIBS to practical fields.
Highlights
The coal provides the largest share of world electricity generation and the thermal power plant share is dominantHow to cite this paper: Wang, Z.Z., Deguchi, Y., Watanabe, H., Kurose, R., Yan, J.J. and Liu, J.P. (2015) Improvement on Quantitative Measurement of Fly Ash Contents Using Laser-Induced Breakdown Spectroscopy
Temperature Correction Factors In Laser-Induced Breakdown Spectroscopy (LIBS) applications the plasma generation process contains several physical phenomena such as electron impact ionization and ion recombination, and its plasma temperature intrinsically fluctuates causing the fluctuation of evaluated concentrations from the LIBS signal intensities
This research has specified the effects of plasma temperature and coexisting materials to the quantitative measurement of contents of fly ash
Summary
How to cite this paper: Wang, Z.Z., Deguchi, Y., Watanabe, H., Kurose, R., Yan, J.J. and Liu, J.P. (2015) Improvement on Quantitative Measurement of Fly Ash Contents Using Laser-Induced Breakdown Spectroscopy. The calibration difficulty of aerosol sample was surpassed by the correction factors This automated LIBS apparatus was applied in a boiler-control system of a power plant with the objective of achieving optimal and stable combustion [23] [24], which enabled real-time measurement of unburned carbon in fly ash. This apparatus featured a detection time capability of less than 1 minute, which showed better real-time capability compared to most of the studies with the preparation of samples and analysis procedures [18] [25]. The CO2 effects were shown and the requirement for quantification was discussed for the real-time measurement of unburned carbon in fly ash for the application of coal-fired power plants
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