1. 西安交通大学能源与动力工程学院，陕西 西安 710049
2. Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8501, Japan
3. 华陆工程科技有限责任公司，陕西 西安 710065
Reduction of CO2 Effect on Unburned Carbon Measurement in Fly Ash Using LIBS
NAN Wei-gang1, 2, 3, Yoshihiro Deguchi2*, WANG Huan-ran1, LIU Ren-wei1, 2, Akihiro Ikutomo2, WANG Zhen-zhen1, 2
1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. Graduate School of Advanced Technology and Science, Tokushima University, Tokushima 770-8501, Japan
3. Hualu Engineering Technology Co. Ltd., Xi’an 710065，China
Abstract：In thermal power plant, the measurement of unburned carbon in fly ash becomes increasingly important because unburned carbon contents are usually important factors for the operation of power plants and it can be an indicator of the combustion conditions Thus, the goal of combustion optimization and efficiency improvement can be achieved. More specifically, the unburned carbon concentration in fly ash reflects the combustion efficiency of the power generator set. The combustion efficiency decreases with increasing of unburned carbon level in fly ash, which means a loss of fuel energy. Owing to the non-contact, fast response, high sensitivity and online measurement features, LIBS was used to measure the quantitative contents in fly ash in this research. But the carbon emission intensity changed with the fluctuant amount of CO2 in flue gas. In this study, dual-channel spectrometer was utilized to analyze the elemental spectra of C，Si，Mg，Fe，Ca，Al and so on, and the neighboring elemental spectra, such as C and Fe, can be recognized in the high resolution channel, which means sufficient fly ash spectrum information can be gained with enough measurement accuracy at the same time. Cyclone was designed and two-stage cyclone system was proposed into the system of LIBS measurement for unburned carbon contents in fly ash. Fly ash particles from the feeder flow through the two-stage cyclone and went into the chamber. The laser shot on the fly ash through the lens. Plasma was acquired and then recorded and analyzed by spectrometer and ICCD camera. The two-stage cyclone system was proven to be detectable for the unburned carbon in fly ash. In addition, two-stage cyclone system can be able to separate and collect fly ash particles from flow gas to reduce the influence of CO2 in fly ash particle flow, thus, exact data can be got to guide the operation of the thermal power plant, which provide more benefits to the engineering applications of LIBS.
南维刚，出口祥啓，王焕然，刘人玮，生友章裕，王珍珍. 减少二氧化碳对LIBS检测飞灰中未燃碳含量影响的研究[J]. 光谱学与光谱分析, 2018, 38(01): 258-262.
NAN Wei-gang, Yoshihiro Deguchi, WANG Huan-ran, LIU Ren-wei, Akihiro Ikutomo, WANG Zhen-zhen. Reduction of CO2 Effect on Unburned Carbon Measurement in Fly Ash Using LIBS. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(01): 258-262.
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