Flame propagation in pulverized coal-air mixtures

Hattori, Hisao

doi:10.1016/s0082-0784(57)80079-4

Cited by 5 publications

(3 citation statements)

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“…There have been many works on the laminar coal air flames. The experimental works were somewhat specific to the individual experimental technique [2]- [12]. They include convective heating of the reactants from hot walls and preheated surface, radiative energy transfer, contact with other flame gases, increased inlet mixture temperature, and the addition of a small amount of gaseous fuel.…”

Section: Introductionmentioning

confidence: 99%

Laminar Burning Velocities of Atmospheric Coal Air Mixtures

Park¹,

Park²

2016

KEPCO Journal on Electric Power and Energy

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The mechanism for laminar dust flame propagation can only be elucidated from a comprehensive mathematical model which incorporates conduction and radiation, as well as the chemical kinetics of particle devolatilization and gas phase and char reaction. The mathematical model for a flat, laminar, premixed coal-air flame is applied to the atmospheric coal-air mixtures studied by Smoot and co-workers, and comparisons are made with their measurements and predictions. Here the principal parameter for comparison is the laminar burning velocity. The studies of Smoot and co-workers are first reviewed and compared with those predicted by the present model. The effects of inlet temperature and devolatilization rate constants on the burning velocities are studied with the present model, and compared with their measurements and predictions. Their measured burning velocities are approximately predicted with the present model at relatively high coal concentrations, with a somewhat increased inlet temperature. From the comparisons, their model might over-estimate particle temperature and rates of devolatilization. This would enable coal-air mixtures to be burned without any form of preheat and would tend to increase their computed values of burning velocity.

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Section: Introductionmentioning

confidence: 99%

Laminar Burning Velocities of Atmospheric Coal Air Mixtures

Park¹,

Park²

2016

KEPCO Journal on Electric Power and Energy

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“…Hattori [1956] reported a burning velocity of 8 cm/sec for the 74-149 jxm coal, contrary to 112 cm/sec reported by Ghosh et al [1956] for less than 74 //m par ticles. After allowance is made for particle size, oxygen concentration etc., it appears that increasingly higher burning velocities were measured in the following order by the various researchers: Marshall et al [1964], Burgoyne and Long [1958], Smoot and Horton [1977], Hattori [1956], and Ghosh et al [1956]. At least part of the differences are likely due to the fact that fine coals tend to agglomerate.…”

Section: Experimental Studies On Coal Combustion: Burning Velocitymentioning

confidence: 60%

“…The heat transfer from the flame holder to the incoming mixture may affect the burning velocity. Intermediate velocities were measured by Hattori [1956] who used pilot flames of various sorts. The fastest burning velocities were measured by Ghosh et al [1956] in a furnace with preheated walls.…”

Section: Experimental Studies On Coal Combustion: Burning Velocitymentioning

confidence: 99%