Unburned carbon measurement in fly ash using laser-induced breakdown spectroscopy with short nanosecond pulse width laser

Liu, Renwei; Deguchi, Yoshihiro; Nan, Weigang; Hu, Ruomu; Wang, Zhenzhen; Fujita, Yuki; Tanaka, Seiya; Tainaka, Kazuki; Tanno, Kenji; Watanabe, Hiroaki; Liu, Jiping; Yan, Junjie

doi:10.1016/j.apt.2019.03.017

Cited by 9 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These parameters are related to the plasma state and signal quality, determined after several debugging, in order to detect the target elements. 12,28 For the accuracy of LIBS data, each sample was duplicated three times in different regions, and combined with the report of the previous study, 3,29 on the steel surface were observed by the field emission SEM performed on a JEOL 7800F coupled with an EDS. The AFM (Bruker INNOVA) was used to determine the evolution of surface roughness of steels during contamination.…”

Section: Experiments and Methodsmentioning

confidence: 99%

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Xie

Wang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Austenitic 316L stainless steel is usually used as the structural material in spent fuel reprocessing facilities. However, the contamination of fission products from spent fuel (especially Cs and Sr) on the surface of facilities will greatly affect its safe decommissioning. In this study, for the first time, with the combination of characterizations of electrochemistry and laserinduced breakdown spectroscopy with two channels, the corrosion and contamination of 316L stainless steel were analyzed in simulated reprocessing environments with HNO 3 concentrations of 3, 6, 8, and 12 M HNO 3 containing Cs and Sr for 7, 14, 21, 30, and 60 days, respectively. The stability order of the passive film of 316L stainless steel in various environments was 12 M HNO 3 > 8 M HNO 3 > 3 M HNO 3 > 6 M HNO 3 . Combined with other characterization methods, a mechanism was proposed. It was found that SrCO 3 , in the matrix, was the main contaminant in the initial 7 days in all environments due to a large number of holes. Then, the dissolution of contaminated steel surface led to the decrease of contaminant, and recontamination occurred after the repassivation of steel. These findings have significant implications for the development and selection of decontamination technology for the contaminated facilities made of 316L stainless steel.

show abstract

Section: Experiments and Methodsmentioning

confidence: 99%

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Xie

Wang

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The C signal from the CO 2 breakdown reduced. The fly ash flow breakdown processes including particle breakdown and surrounding gases breakdown, as well as the plasma states, were discussed by our group in detail presented elsewhere Figure a,b shows the measured results of fly ash with and without CO 2 using 6 and 1 ns pulse-width lasers, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The fly ash flow breakdown processes including particle breakdown and surrounding gases breakdown, as well as the plasma states, were discussed by our group in detail presented elsewhere. 42 Figure 4a,b shows the measured results of fly ash with and without CO 2 using 6 and 1 ns pulse-width lasers, respectively. There was no significant change of the measured spectra with different CO 2 concentrations using a 1 ns pulsewidth laser, as shown in Figure 4b.…”

Section: Resultsmentioning

confidence: 99%

“…There is a time difference between the particle plasma and gas plasma generation. Therefore, the laser energy and laser pulse width can be altered to control the surrounding gas plasma generation by multiphoton ionization and electron collision ionization to study the surrounding CO 2 effect on the unburned carbon measurement in fly ash, especially the laser pulse width …”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Detection Improvement of Unburned Carbon Content in Fly Ash Flow Using LIBS with a Two-Stage Cyclone Measurement System

et al. 2019

Self Cite

View full text Add to dashboard Cite

Fly ash contents can be considered as a basis for optimal and stable boiler combustion control and fly ash quality control in power plants, especially the unburned carbon in fly ash. The real-time and quantitative measurement of the contents in fly ash was studied using a constructed two-stage cyclone measurement system and detected using the laser-induced breakdown spectroscopy (LIBS) technique. The surrounding gas effect, such as the CO2 effect on the unburned carbon content, was studied comprehensively in this paper. The CO2 effect was eliminated using this proposed combination method of a two-stage cyclone measurement system and LIBS with a 1 ns pulse-width laser according to the efficient gas–particle separation and the controlled laser-induced plasma processes of particle flow. The quantitative analysis was improved using the plasma temperature correction method, with the intensity ratio of the emission pair from magnesium as the plasma temperature indicator. The measurement of the unburned carbon content in fly ash with the temperature correction method presented the concordant results analyzed by the chemical analysis method. The feasibility and improved detection ability for the real-time measurement of fly ash contents in power plants are demonstrated.

show abstract

“…It is necessary to take measures to ensure the repeatability and stability of spectral data. Some researchers committed to reducing the probability of low quality laser breakdown by transforming and optimizing the LIBS experimental system, such as employing a conical tube, 22 dual lens, 23 short laser pulse width, 24 two-stage cyclone measurement system, 25 and other attempts. 26 However, although equipment optimization can improve the stability of measurement to a certain extent, it is still unable to avoid the generation of the invalid spectrum.…”

Section: Introductionmentioning

confidence: 99%

An image auxiliary method for laser-induced breakdown spectroscopy analysis of coal particle flow

Chen

Dong

Cai

et al. 2022

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

show abstract

Unburned carbon measurement in fly ash using laser-induced breakdown spectroscopy with short nanosecond pulse width laser

Cited by 9 publications

References 29 publications

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Detection Improvement of Unburned Carbon Content in Fly Ash Flow Using LIBS with a Two-Stage Cyclone Measurement System

An image auxiliary method for laser-induced breakdown spectroscopy analysis of coal particle flow

Contact Info

Product

Resources

About

Unburned carbon measurement in fly ash using laser-induced breakdown spectroscopy with short nanosecond pulse width laser

Cited by 9 publications

References 29 publications

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO3-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO3-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Detection Improvement of Unburned Carbon Content in Fly Ash Flow Using LIBS with a Two-Stage Cyclone Measurement System

An image auxiliary method for laser-induced breakdown spectroscopy analysis of coal particle flow

Contact Info

Product

Resources

About

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium

Corrosion and Contamination of 316L Stainless Steel in Simulated HNO₃-Based Spent Nuclear Fuel Reprocessing Environments with Cesium and Strontium