effect of concentration and particle size on the burning velocity of laminar coal dust flames
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effect of concentration and particle size on the burning velocity of laminar coal dust flames

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Published by Pennsylvania State University] in [University Park .
Written in English

Subjects:

  • Coal, Pulverized.,
  • Coal -- Combustion.

Book details:

Edition Notes

Statementby W. F. Marshall, Jr., and H. B. Palmer.
ContributionsPalmer, Howard Benedict, 1925- joint author., Pennsylvania. State University. Dept. of Fuel Technology.
Classifications
LC ClassificationsTN1.A1 P45 no. 43
The Physical Object
Paginationv, 54 l.
Number of Pages54
ID Numbers
Open LibraryOL4923278M
LC Control Number76281443

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The laminar burning velocity of a stabilized dust flame is experimentally investigated in the present work. The dust used was aluminum powder with an average particle diameter of approximately 5 microns. Dust flames, in comparison to gas flames, are thicker and brighter, may be influenced by radiation heat transfer, respond differently to heat losses, and are influenced by the particular flow Cited by: 2. 49 Experimental study of the effects of coal dust particle size on laminar burning velocity in a mixture of coal dust he iningeologyetroleum ngineering ulletin and the authors pp. 4 DI rgn to the amount of heat released from the explosion. (dp/ dt) max is . A brief review on the effect of particle size on the laminar burning velocity of flammable dust: Application in a large-scale CFD tool July Journal of Loss Prevention in the Process. In the program, the flame velocity was determined as a function of coal concentration, volatility, and particle size. Other tests included adding 2% CH4 to a particular flame and observing the.

  A second objective is to perform parametric analysis of the effect of particle size and initial system temperature on burning velocity. The third and final objective of this work is to demonstrate the impact of particle spacing and discrete particle combustion on coal dust flames.   Huang et al. reported that the aluminum dust laminar flame speed is affected by the fine particle concentration within the mixture. Therefore, for a dust at a given particle diameter, the values of P max and K St will be affected by a systematic variation of the small and large particle size fraction contained in the mixture (i.e., different σ D). The laminar burning velocity as a function of dust concentration for the dusts that were investigated are shown in the Figures The bur ning velocities presented are.   Numerous experimental studies have been conducted to determine the particle burning time for micron-sized and larger particles. The size dependence of the burning time usually does not follow the classical d 2-law, but a more general d n-model, with n ranging from to It was suggested that the oxide lobe accumulated on the particle surface during the burning process leads .

  The results show that the laminar burning velocity reduces with the addition of coal dust having particle sizes in the ranges of 53–63 μm and 75–90 μm, irrespective of the equivalence ratio values. However, burning velocity promotion is observed for one case with particle size in the range of 0–25 μm at an equivalence ratio of The main objective of this work is to verify the ability of a CFD model based on a unity Lewis number assumption to explore laminar burning velocity in coal dust clouds. A second objective is to perform parametric analysis including the role of surface reactions, particle .   The effect of coal dust concentration on inertant requirement was studied by varying the coal dust concentrations in the range of – g/m 3 for all the aforementioned coal dust sizes using a fixed rock dust of size of coal dust of size was mixed with the rock dust . Request PDF | The effects of coal dust concentrations and particle sizes on the minimum auto‐ignition temperature of a coal dust cloud | Flash fires and explosions in areas containing an.