Ignition characteristics and alkali metal release behaviors of single-particle coal in O2/CO2 or O2/N2 atmospheres using optical diagnostic technology

Wei, Juntao; Li, Jinyun; Xu, Deliang; Zhang, Shu; Vuthaluru, Hari; Kontchouo, Félix Mérimé Bkangmo; Huang, Ankui; Song, Xudong

doi:10.1016/j.joei.2023.101395

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…36 Furthermore, due to the higher specific heat capacity of CO 2 compared to N 2 , 37 the flame temperature is lower during the fuel particle combustion process in an O 2 /CO 2 atmosphere. 26 In addition, CO 2 suppresses the radical reactions that promote combustion. 38 The ambient diffusion of CO 2 causes the conversion of the K compound to be converted to K 2 CO 3 with less volatility, and the decomposition of K 2 CO 3 is inhibited by CO 2 .…”

Section: Analysis Of the Temporal And Spatial Distribution Of Alkali ...mentioning

confidence: 99%

“…It has been shown that the combustion characteristics of solid fuel will be changed by the change of combustion atmosphere. 26,27 Most optical measurements recently used in coal combustion research were mainly for using a flat-flame burner, which always used CO and CH 4 as fuel, to ignite the coal particles. 12,23,28−30 It is hard to control the combustion atmosphere because the combustion of these fuels would produce CO 2 and H 2 O, which have some effect on the release behavior of alkalis.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Temporal and Spatial Release Behavior of Alkali Metals during the Combustion of Different Solid Fuels

Dong,

Luo,

et al. 2023

Energy Fuels

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In this study, alkali metals (K and Na) released during the combustion of single solid fuels (eucalyptus, bagasse, and Indonesian coal) were analyzed by using CO 2 laser ignition technology combined with flame spontaneous emission spectroscopy. The temporal and spatial distribution characteristics were investigated, and the impact of atmospheres on their release behavior was examined. The measurements demonstrate that, during the initial stage of combustion, the flame height and height of maximum K release intensity are as follows: coal < eucalyptus < bagasse. Additionally, the highest point of K release intensity aligns with the flame center position. Compared to the O 2 /N 2 atmosphere, the release intensity of K atoms during the combustion process of eucalyptus and bagasse was more uniform in the O 2 /CO 2 atmosphere. Furthermore, the difference in the distributions between the two fuels became smaller. The K atom release time during coal combustion was longer, and the flame height decreased more gradually. In various environments, the peak release of potassium increased as the concentration of oxygen increased, and the time at which the peak occurred started to appear earlier. The total intensity of potassium release, as an integral for biomass combustion, increased exponentially with an increase in oxygen concentration, whereas for coal combustion, it increased linearly with the increase of oxygen concentration. In addition, the integrated total intensity of released alkali metals is less inhibited by CO 2 when O 2 concentration increases. However, the decrease in biomass inhibition is more significant for biomass compared to coal, indicating that CO 2 has a more pronounced inhibitory effect on biomass.

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Section: Analysis Of the Temporal And Spatial Distribution Of Alkali ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Temporal and Spatial Release Behavior of Alkali Metals during the Combustion of Different Solid Fuels

Dong,

Luo,

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

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Indicators for Assessing the Combustion Intensity of Coal Particles Using a Single UV Sensor

Choiński,

Stebel,

Malcher

et al. 2024

JSAN

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This paper deals with the evaluation of the combustion intensity of coal particles on the basis of measurement data (UV radiation) from a scanning point photodiode. UV radiation is measured using a custom UV scanner at different distances from the burner in the vertical combustion chamber. The designed scanner uses a sensitive silicon carbide (SiC) photodiode, and its dynamical properties are investigated in the present work. Subsequently, experiments are performed for coal particles at different combustion temperatures and at different measuring locations of the scanner. The measurement data are processed in the frequency domain using the proposed algorithm, and two indicators for evaluating the combustion intensity are proposed. The obtained results show that the proposed indicators provide unequivocal information about the combustion intensity as a function of the combustion temperature.

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Ignition characteristics and alkali metal release behaviors of single-particle coal in O2/CO2 or O2/N2 atmospheres using optical diagnostic technology

Cited by 2 publications

References 25 publications

Study on the Temporal and Spatial Release Behavior of Alkali Metals during the Combustion of Different Solid Fuels

Study on the Temporal and Spatial Release Behavior of Alkali Metals during the Combustion of Different Solid Fuels

Indicators for Assessing the Combustion Intensity of Coal Particles Using a Single UV Sensor

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