Radiation Properties of Coal Char Particle Cloud

Itaya, Yoshinori; Kosaka, Fumiya; Kobayashi, Nobusuke

doi:10.1252/jcej.12we124

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…Itaya et al investigated the radiation properties of fine char particle clouds. Among others, they found a greater extinction efficiency for a higher carbon content [23].…”

Section: Introductionmentioning

confidence: 97%

Char particle emissivity of two coal chars in oxy-fuel atmospheres

Graeser

Schiemann

2016

Fuel

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“…Itaya et al investigated the radiation properties of fine char particle clouds. Among others, they found a greater extinction efficiency for a higher carbon content [23].…”

Section: Introductionmentioning

confidence: 97%

Char particle emissivity of two coal chars in oxy-fuel atmospheres

Graeser

Schiemann

2016

Fuel

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“…The burnout degree has a great influence on the radiation characteristics of particles. In some works, particle emissivity, which varies linearly with burnout degree, is used, 26 that is, e = 0.4 U c + 0.6, where U c represents the proportion of unburned carbon in particle.…”

Section: Mathematical Modelmentioning

confidence: 99%

Simulation of Pulverized Coal Combustion Process Considering Turbulence–Radiation Interaction

Zheng

Liu

2023

ACS Omega

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In this paper, the combustion process of a 350 MW opposite pulverized coal combustion boiler is studied using a combined field test and numerical simulation. Considering the turbulence–radiation interaction (TRI) effect caused by turbulent particle pulsation during the combustion process, the TRI model is modified by introducing optical factors. The interaction between the optical thickness and the radiation pulsation of pulverized coal particles during the combustion process is studied to learn the influences of turbulent particle combustion on radiative heat transfer. According to the analysis of the TRI influence on pulverized coal combustion, the temperature of the cross section decreases with TRI. Compared with the traditional radiation model calculation, the time-average temperature of the cross section is reduced by 49.85 K, and the deviation from the experimental data is reduced by 1.54%. It is proved that the temperature distribution in the furnace considering TRI is closer to reality. In the numerical simulation of the TRI sensitivity to the optical thickness of the particles, it is found that with TRI, the increase of optical thickness will strengthen the effect of turbulent kinetic energy in the combustion area. Due to the increase in particle density, the content of the main radiation medium produced by combustion, H2O and CO2, increases and the radiation effect in the furnace is enhanced. In the fire area with dense particles, the average temperature of the cross section increases by 28 K. Hence, the change in optical thickness causes the change of TRI parameters, and the TRI effect becomes more significant with the increase of particle load.

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“…Cloud" by Yoshinori Itaya, Fumiya Kosaka and Nobusuke Kobayashi, Gifu University and Nagoya University (Itaya et al, 2013) Citation: This paper presents the evaluation on the radiation properties of coal char and ash particles. Char in coal-firing and gasification processes exists in a form of heterogeneous composite particles consisting of nano-order fine particles made mainly of soot and micron-order particles of carbon and ash components.…”

Section: "Radiation Properties Of Coal Char Particlementioning

confidence: 99%

JCEJ Outstanding Paper Award of 2013

Nakagawa

Tsukada

2014

J. Chem. Eng. Japan

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JCEJ Paper Award is given for outstanding contribution to chemical engineering documented in a paper published in Journal of Chemical Engineering of Japan. The selection is made by means of a three-stage process consisting of nomination, first round elimination, and point rating. Outstanding Paper Awards Subcommittee of the journal has assessed the 116 papers published in 2013, corresponding to volume 46. The subcommittee selected the candidates of the award and the members of the editorial board confirmed the selection. As a result of this process, the editorial board finally selected the following five papers for the award of 2013. "Radiation Properties of Coal Char ParticleCloud" by Yoshinori Itaya, Fumiya Kosaka and Nobusuke Kobayashi, Gifu University and Nagoya University (Itaya et al., 2013) Citation: This paper presents the evaluation on the radiation properties of coal char and ash particles. Char in coal-firing and gasification processes exists in a form of heterogeneous composite particles consisting of nano-order fine particles made mainly of soot and micron-order particles of carbon and ash components. The authors successfully determined dependency of carbon content on the properties in the term of monochromatic extinction efficiency, whose magnitude was reasonable compared with those predicted from Mie's theory, through the FT-IR measurement of char classified into a narrow particle size distribution by a wet pretreatment. They noted also a strong forward scattering. The results contribute to the simplified but precise analyses ignoring the effect of scattering for radiation heat transfer problems in the processes. Thus the paper deserves to the Outstanding Paper Awards.2. "Evaluation of a Self-Heat Recuperative ermal Process Based on ermodynamic Irreversibility and Exergy" by Yasuki Kansha, Yui Kotani, Muhammad Aziz, Akira Kishimoto and Atsushi Tsutsumi, the University of Tokyo and Tokyo Institute of Technology (Kansha et al., 2013) Citation: This paper describes a simple calculation technique for the minimum energy required for thermal processes. The authors present an exergy analysis and a calculation method for a self-heat recuperative thermal process. The authors pay attentions to the minimum energy required for the thermal process and indicated that this process can achieve energy requirements close to the energy required for heat transfer from an exergy point of view by both the theoretical and graphical analyses. In the theoretical analysis, the simple equation of the numerical minimum energy required for heat transfer was derived. These achievements contribute to as new calculation method that examines the energy saving potential when designing a thermal process. Therefore, this paper deserves the Outstanding Paper Award.3. "Micropore Filling Phase Permeation of a Condensable Vapor in Silica Membranes: A Molecular Dynamics Study" by Tomohisa Yoshioka, Hiroki Nagasawa, Masakoto Kanezashi and Toshinori Tsuru, Hiroshima University (Yoshioka et al., 2013) Citation: In this paper, the permeation...

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Radiation Properties of Coal Char Particle Cloud

Cited by 11 publications

References 14 publications

Char particle emissivity of two coal chars in oxy-fuel atmospheres

Char particle emissivity of two coal chars in oxy-fuel atmospheres

Simulation of Pulverized Coal Combustion Process Considering Turbulence–Radiation Interaction

JCEJ Outstanding Paper Award of 2013

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