Ignition and combustion of laser-heated pulverized coal

Qu, Mingchang; Ishigaki, Masahiro; Tokuda, Masanori

doi:10.1016/0016-2361(96)00079-8

Cited by 27 publications

(16 citation statements)

References 12 publications

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“…Valerio et al [5] experimentally investigated the burnout time and the ignition temperature of individual char particles, and finally presented a predictive model of burnout time. Heating, oxidation [6,7], ignition [8], and burning [9,10] characteristics of graphite have been extensively studied, not only experimentally, but also theoretically and/or numerically. Qu et al [8] reported that the graphite particles were heated gradually, and accumulated heat released the oxidation reaction that triggered the ignition of graphite.…”

Section: Introductionmentioning

confidence: 99%

“…Heating, oxidation [6,7], ignition [8], and burning [9,10] characteristics of graphite have been extensively studied, not only experimentally, but also theoretically and/or numerically. Qu et al [8] reported that the graphite particles were heated gradually, and accumulated heat released the oxidation reaction that triggered the ignition of graphite. Significant differences among the burning behaviors of graphite exist under different operation conditions.…”

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

et al. 2020

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Microscale combustion has potential application in a micro power generator. This paper studied the ignition and combustion behavior of individual graphite microparticles in a micro-combustor to explore the utilization of carbon-based fuels at the microscale system. The individual graphite microparticles inside the micro-combustor were ignited by a highly focused laser in an air flow with natural convection at atmospheric temperature and pressure. The results show that the ignition of graphite microparticles was heterogeneous. The particle diameter had a small weak effect on ignition delay time and threshold ignition energy. The micro-combustor wall heat losses had significant effects on the ignition and combustion. During combustion, flame instability, photophoresis, repetitive extinction and reignition were identified. The flame structure was asymmetric, and the fluctuation of flame front and radiation intensity showed combustion instability. Photophoretic force pushed the graphite away from the focal point and resulted in extinction. Owing to large wall heat loss, the flame quickly extinguished. However, the graphite was inductively reignited by laser.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

et al. 2020

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“…Изучение этих процессов с использованием лазерного зажигания имеет ряд преимуществ: легкий оптический доступ к частицам, возможность прямого наблюдения воспламенения частиц. Работы по лазерному зажиганию углей ведутся давно с использованием неодимового и CO 2 -лазеров, работающих в импульсном и непрерывном режиме [4][5][6][7][8][9]. Однако детальное исследование различных стадий зажигания в этих работах не выполнено.…”

Section: Introductionunclassified

Зажигание Каменных Углей Различных Стадий Метаморфизма Лазерными Импульсами В Режиме Свободной Генерации

Адуев¹,

Нурмухаметов²,

Крафт³

et al. 2020

Журнал Технической Физики

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“…Most optical measurements recently used in coal combustion research were mainly for using a flat-flame burner to heat the coal particle. − A flat-flame burner always used CO and CH 4 as fuel, and the combustion of these fuels would produce CO 2 and H 2 O, which have some effect on the release behavior of alkalis. , Laser ignition technology can be an alternative to study the effect of the atomsphere on the release of alkalis, which is widely used to estimate the ignition and combustion process of solid fuel. A CO 2 laser was used to heat the pulverized fuel at different atmospheres, detecting the flame emission spectrum and the sketch of the flame to study the combustion process. , Ao et al used a CO 2 laser as the heat source to ignite boron powder to study the effect of the initial oxide layer on ignition and combustion. To present the ignition and combustion behaviors of different types of coal, Taniguchi et al used a YAG laser with the near-infrared region wavelength to heat the pulverized coal dust clouds suspending in a laminar upward flow to study the effects of the coal type, particle diameter, and oxygen concentration on the lean limit and velocity of flame propagation.…”

Section: Introductionmentioning

confidence: 99%

Study on the Alkali Release from the Combustion Products of a Single Coal Particle by Laser Ignition

Dong

Lü

et al. 2017

Energy Fuels

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This work concerned the measurement of alkali metal (Na and K) release during the combustion process of three different types of coal at atmospheric pressure. Measurements were performed from the CO2 laser ignition of a single coal particle in different oxygen concentrations of O2/N2 and O2/CO2 atmospheres. An atomic emission spectrum of alkali metals was directly collected by the slit of the spectrometer with an intensified charge-coupled device (ICCD) detector to obtain the temporal and spatial release behaviors of alkalis. The results indicated that the type of coals would influence the release process of alkali metals, whose release duration would be longer for the coals with a higher carbonization level. With the increase of the oxygen concentration, the intergal intensity of Na and K during combustion was found to be enhanced and the release amount increased with obvious exponential growth. In comparison to the O2/N2 atmosphere, CO2 in the oxygen-rich atmosphere had an obvious inhibitory effect on alkali metal release, which was most notable for anthracite. The release processes of alkali metals in different types of coal were also related with the flame temperature, which have little correlation with the spatial distribution of alkali metals, probably as a result of the diffusion effects.

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Ignition and combustion of laser-heated pulverized coal

Cited by 27 publications

References 12 publications

Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

Зажигание Каменных Углей Различных Стадий Метаморфизма Лазерными Импульсами В Режиме Свободной Генерации

Study on the Alkali Release from the Combustion Products of a Single Coal Particle by Laser Ignition

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