Laser ignition and flame propagation of pulverized coal dust clouds

Taniguchi, Masayuki; Kobayashi, Hironobu; Auhata, Sigeru

doi:10.1016/s0082-0784(96)80164-0

Cited by 20 publications

(43 citation statements)

References 10 publications

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“…Object of this chapter is to develop a model to predict lean flammability limit and flame propagation velocity for pulverized solid fuels, and to apply the model to engineering design for burner systems. Figure 3 shows a schematic of the laser ignition equipment [10][11][12]25]. Uniformly sized pulverized coal particles were suspended in a laminar upward flow and rapidly heated by a single-pulsed YAG laser.…”

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

“…Observed flame images are shown in Fig.4. Flame propagation velocity was analyzed by increasing the flame radius [11]. Photos of the flame of a hv-bituminous coal (high volatile content) and a lv-bituminous coal (low volatile content) are shown in the figure.…”

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

“…When particle diameter was fine, flame propagation velocity was large. Lean flammability limit was analyzed by measuring the lower limit of particle concentration at which the flame could grow [11]. When coal concentration was high; almost the same as that for actual systems, the flame moves from the particle directly heated by the pulsed YAG laser to neighboring particles; in this way the flame grew.…”

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

“…When coal concentration was high; almost the same as that for actual systems, the flame moves from the particle directly heated by the pulsed YAG laser to neighboring particles; in this way the flame grew. We defined these phenomena as flame propagation [11,25]. Only particles directly heated by the pulsed laser burned when the coal concentration was low.…”

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

“…Fujita et al [8] examined the effect of surrounding oxygen concentration and pressure on flame propagation velocity, while Suda et al [9] examined flame propagation velocities for oxy-fuel combustion conditions. Chen et al [10] and Taniguchi et al [11] developed laser ignition equipment to examine flame propagation velocity of pulverized coals. As well, Taniguchi et al [12] examined the relationship between flame propagation velocity and lean flammability limit for various coals.…”

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confidence: 99%

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Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

Section: Ignition and Flame Propagation Phenomena For Pulverized Coalmentioning

confidence: 99%

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An investigation on thermal‐recycling of recycled plastic resin (spherically symmetric analysis of abrupt heating processes of a micro plastic‐resin particle)

Yamakita

Ishino

Ohiwa

2006

Heat Trans. Asian Res.

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A fundamental understanding of the physical properties of a micro plastic-resin particle subjected suddenly to hot combustion gas, such as the temperature history in the micro particle and its lifetime, is necessary for effectively realizing thermal recycling of recycled plastic resin. However, micro plastic particles have such small diameters, ranging from 100 µm to 200 µm, that the measurement of temperature histories within them is extremely difficult. In this paper, therefore, a spherically symmetric one-dimensional analysis is applied to the abrupt heating process of a micro plastic resin particle in a high temperature inert atmosphere. Variations of the temperature history and the lifetime with the ambient gas temperature and the initial particle diameter are numerically analyzed, by dividing the entire heating process into four independent periods; the solid heating period, the melting period, the liquid heating period, and the vaporization period. Effects of the Nusselt number on the particle lifetime are also discussed. It is found that, by suitably taking account of the influences of heat transfer properties, the proposed simplified analysis is useful for estimating the fundamental and overall temperature characteristics of a micro plastic resin particle under abrupt heating.

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Turbulent flame propagation of polymethylmethacrylate particle clouds in an O2/N2 atmosphere

Xia

Hashimoto

Fujita

2021

Combustion and Flame

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Laser ignition and flame propagation of pulverized coal dust clouds

Cited by 20 publications

References 10 publications

Fundamental Experiments of Coal Ignition for Engineering Design of Coal Power Plants

Fundamental Experiments of Coal Ignition for Engineering Design of Coal Power Plants

An investigation on thermal‐recycling of recycled plastic resin (spherically symmetric analysis of abrupt heating processes of a micro plastic‐resin particle)

Turbulent flame propagation of polymethylmethacrylate particle clouds in an O2/N2 atmosphere

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