Simultaneous imaging of Mie scattering, PAHs laser induced fluorescence and soot laser induced incandescence to a lab-scale turbulent jet pulverized coal flame

Hayashi, Jun; Hashimoto, Nozomu; Nakatsuka, Noriaki; Tainaka, Kazuki; Tsuji, Hirofumi; Tanno, Kenji; Watanabe, Hiroaki; Makino, Hisao; Akamatsu, Fumiteru

doi:10.1016/j.proci.2018.09.028

Cited by 27 publications

(22 citation statements)

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“…Since polycyclic aromatic hydrocarbons (PAHs) are known as a soot precursor, information relating to their formation is crucial with respect to the soot-formation processes (Michelsen H.A., 2017 andDesgroux P. et al, 2013). In order to understand the transitional soot formation processes in the pulverized-coal flame, Hayashi et al (2019) conducted two different simultaneous measurements ("Mie scattering for coal particles with LIF for PAHs" and "LIF for PAHs with LII for soot") in the coal jet burner.…”

Section: Simultaneous Imaging Of Mie Scattering Polycyclic Aromatic Hydrocarbons Laser-induced Fluorescence and Soot LII With Respect To mentioning

confidence: 99%

“…Thus, the clarifica-Fig. 26 Comparison of the radial distributions for (a), (b) the soot LII signal (Hayashi J. et al, 2013) and the calculated soot volume fraction, (c), (d) the Mie scattering signal (Hayashi J. et al, 2019) and the calculated surface area of coal particles, (e), (f) the calculated gas temperature and the O 2 concentration, and (g), (h) the net soot formation rate at a HAB = 60 and 120 mm, respectively. Reprinted with permission from Ref.…”

Section: Fig 25mentioning

confidence: 99%

“…Fig.11Schematic of the coal jet burner and supplying system. Reprinted with permission from Ref (Hayashi J. et al, 2019)…”

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confidence: 99%

“…Fig.20Two-dimensional distribution of Coal-Mie (in Green), PAHs-LIF (in Blue) and soot-LII (in Red) at different HAB. Reprinted with permission from Ref (Hayashi J. et al, 2019)…”

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Coal Particle Devolatilization and Soot Formation in Pulverized Coal Combustion Fields

Hashimoto

Hayashi

2021

KONA

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In this paper, recent developments of the devolatilization model and soot-formation model for the numerical simulations of pulverized-coal combustion fields, and the technology used to measure soot particles in pulverizedcoal combustion fields are reviewed. For the development of new models, the validation of the developed models using measurement is necessary to check the accuracy of the models because new models without validation have a possibility to make large errors in simulations. We have developed the tabulated devolatilization process model (TDP model) that can take into account the effect of particle heating rate on the volatile matter amount and the devolatilization-rate parameters. The accuracy of the developed TDP model was validated by using the laser Doppler velocimetry data for the bench-scale coal combustion test furnace. The soot-formation model combined with TDP model for the large eddy simulation (LES) has been also developed. The spatial distributions of both the soot-volume fraction and the polycyclic aromatic hydrocarbons were measured by virtue of laser-induced incandescence (LII) and laser-induced chemiluminescence (PAHs-LIF). The accuracy of the developed sootformation model was validated by using the measured data.

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Section: Simultaneous Imaging Of Mie Scattering Polycyclic Aromatic Hydrocarbons Laser-induced Fluorescence and Soot LII With Respect To mentioning

confidence: 99%

Section: Fig 25mentioning

confidence: 99%

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Coal Particle Devolatilization and Soot Formation in Pulverized Coal Combustion Fields

Hashimoto

Hayashi

2021

KONA

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“…．Stimpson らは，2 色レーザー消光法を用いて，40 kWth と 150 kWth の 2 つの異なる発熱量を持つスワールバーナに形成された微粉炭火炎中におけるすすの体積分率に対して line of sight 計測を行った．計測されたすすの体積分率は 10×10 -9 ~ 200×10 -9 の範囲であり，燃焼場全体の当量比や酸化剤の種類と比較して，局所的な当量比が微粉炭火炎中のすす体積分率に大きな影響を与えることを明らかにしている (Hayashi et al, 2013(Hayashi et al, , 2019) ．また，時間分解レーザー誘起赤熱法 (Time-Resolved LII: TiRe-LII) と熱泳動サンプリング法を組み合わせによって，すすの一次粒子径の空間分布を測定し，孤立した小さなすす領域が燃焼場全体に瞬間的に存在していることを明らかにした (Hashimoto et al, 2016 (Alam et al, 2015…”

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Visualization of the soot formation process in the volatile flame of single coal particle using 10-kHz PAHs-PLIF, LII and LIS

晋也¹,

大輔²,

記章³

et al. 2021

Transactions of the JSME (In Japanese)

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Soot formation process during coal combustion is one of a key phenomenon to achieve a high-performance furnace. This is because the thermal radiation of soot influences the temperature distribution and the heat transfer process in the furnaces. In this study, polycyclic aromatic hydrocarbons (PAHs) and soot were visualized by a 10 kHz planar laser induced fluorescence (PLIF), laser induced incandescence (LII) and laser induced scattering (LIS) to investigate the soot formation processes in the volatile flame of single pulverized coal particle combustion. In addition, the magnified high-speed imaging was conducted to capture the combustion behavior of the single coal particle. Pulverized coal particles entered high temperature region formed by hydrogen/air diffusion flame in the counterflow. Results showed that five typical combustion behaviors were observed by magnified high-speed imaging. This paper succeeded in visualizing the process from the release of volatile matter to soot formation of single pulverized coal particles with high-speed PAHs-PLIF, LII and LIS measurements. The results showed that the size of PAHs and soot areas was similar, but the duration of PAHs was longer than soot. Also, the PAHs signal was locally high, suggesting that PAHs were directly released from pulverized coal.

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Simultaneous measurements of LII/LIF/LIS on single-coal-particle combustion

Sawada,

Okada,

Tainaka

et al. 2023

Appl. Phys. B

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Simultaneous imaging of Mie scattering, PAHs laser induced fluorescence and soot laser induced incandescence to a lab-scale turbulent jet pulverized coal flame

Cited by 27 publications

References 31 publications

Coal Particle Devolatilization and Soot Formation in Pulverized Coal Combustion Fields

Coal Particle Devolatilization and Soot Formation in Pulverized Coal Combustion Fields

Visualization of the soot formation process in the volatile flame of single coal particle using 10-kHz PAHs-PLIF, LII and LIS

Simultaneous measurements of LII/LIF/LIS on single-coal-particle combustion

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