Characterization of Fly Ash Laser-Induced Plasma for Improving the On-line Measurement of Unburned Carbon in Gas–Solid Flow

Yao, Shunchun; Xu, Jia; Zhao, Jingbo; Bai, Kaijie; Lü, Jidong; Lü, Zhipeng

doi:10.1021/acs.energyfuels.6b02997

Cited by 17 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Particle size inhomogeneity is one of the major matrix effects in the measurement of particle flow. The influence can be broadly classified into two types: (1) the uneven distribution of element depended on the particle diameter; 20 , 21 (2) the size effect to the plasma–particle interaction 22 , 23 . In this paper, to evaluate the size effect in spark plasma, quartz sands with different diameters were tested to exclude influence of compositional dependence on the particle diameter.…”

Section: Resultsmentioning

confidence: 99%

Optimizing critical parameters for the directly measurement of particle flow with PF-SIBS

Yao

Zhang

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

A novel measurement technology named as particle flow-spark induced breakdown spectroscopy (PF-SIBS) was reported for real-time measurement of solid materials. Critical measurement parameters of PF-SIBS were optimized and a set of fly ashes with different carbon content were measured for evaluation of measurement performance. Four electrode materials, tungsten, copper, molybdenum and platinum, were compared in the aspects of signal stability, line interference and electrode durability. Less line interference and better signal stability were obtained with W and Cu electrode, while W electrode has better durability. Quartz sand with diameters from 48 μm to 180 μm were tested to investigate the influence of particle size. As the particle diameter increased, the intensity of Si 288.16 nm line decreased while that of ambient air constituents increased. To reduce the particle effect, the sum intensity from sample and ambient air were introduced to correct. The RSD of line intensity between the five diameters were reduced from 67.30% to 16.59% with Cu electrodes and from 63.21% to 13.64% with W electrodes. With the optimal measurement parameters and correction, fly ash samples with different carbon content were tested and the correlation coefficients R2 of multivariate calibration achieved 0.987.

show abstract

Section: Resultsmentioning

confidence: 99%

Optimizing critical parameters for the directly measurement of particle flow with PF-SIBS

Yao

Zhang

et al. 2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…The particle flow spark-induced breakdown spectra were employed for the rapid measurement of unburned carbon in fly ash. A series of data-processing methods including spectral interference correction and quantitative analysis methods were carried out to improve the measurement accuracy. , A homemade gas–solid flow generation system was also developed to simulate the gas–solid flow in the duct of a coal-fired plant by this group . LIBS has also been applied to detect the pulverized coal, char, and unburned carbon in fly ash without any sample preparation under high-pressure and high-temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

“…34,35 A homemade gas−solid flow generation system was also developed to simulate the gas− solid flow in the duct of a coal-fired plant by this group. 36 LIBS has also been applied to detect the pulverized coal, char, and unburned carbon in fly ash without any sample preparation under high-pressure and high-temperature conditions. The correction factors for the quantitative measurement were proposed and determined to surpass the calibration difficulty of the aerosol sample.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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

“…In addition to the ability to measure simultaneously several atomic elements, LIBS can measure light elements ( Z < 12) such as carbon, hydrogen, oxygen, etc., unlike XRF. Studies on shale , and coal , demonstrate that LIBS may be used to measure the organic components of natural samples. Moreover, the development of spectral analysis tools such as chemometrics − makes the LIBS spectroscopy a more powerful tool for quantitative measurements. , All of these features make LIBS an excellent candidate to characterize the oil sands composition.…”

Section: Introductionmentioning

confidence: 99%

Rapid Determination of Bitumen Content in Athabasca Oil Sands by Laser-Induced Breakdown Spectroscopy

et al. 2018

View full text Add to dashboard Cite

Evaluation of bitumen content in oil sands feedstock is important to control the extraction process and improve the recovery efficiency. Current standard techniques for bitumen determination in oil sands ore suffer whether from their timeconsuming labor intensive method of sample preparations or from requiring a high number of samples for calibration purposes. The analysis of bitumen ore samples is very challenging for the analytical chemist due to its nature of several phases of wet and dry particles and heterogeneous mixture of clay, bitumen, water, and solid contents. In this paper, we present a new enabling method using LIBS to determine rapidly and without sample preparation the bitumen content in oil sands ores. A qualitative study by principal component analysis was first done, and then a partial least-squares method was performed to assess the feasibility of determining bitumen by LIBS. The results show a good correlation between LIBS spectra and bitumen content and a prediction averaged absolute error around 0.7%. This method demonstrates that the LIBS is a promising tool for rapidly assessing oil sands ore grades either in the lab, at-line, or online. Elemental composition of solids is also investigated.

show abstract

Characterization of Fly Ash Laser-Induced Plasma for Improving the On-line Measurement of Unburned Carbon in Gas–Solid Flow

Cited by 17 publications

References 19 publications

Optimizing critical parameters for the directly measurement of particle flow with PF-SIBS

Optimizing critical parameters for the directly measurement of particle flow with PF-SIBS

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

Rapid Determination of Bitumen Content in Athabasca Oil Sands by Laser-Induced Breakdown Spectroscopy

Contact Info

Product

Resources

About