Co-Axial Turbulent Diffusion Flames with Directed Oxygen Injection

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Title Co-Axial Turbulent Diffusion Flames with Directed Oxygen Injection
Creator Rezaei, Dadmehr; Wendt, Jost O.L.
Date 2012-09-06
Abstract There are practical and safety advantages in adding oxygen to as few input streams as possible. Additionally, oxy-coal combustion permits the concentration of oxygen in each burner stream to be controlled as an independent variable. Input concentrations of oxygen and the manner in which it is injected can have significant effects on the turbulent mixing and flame stability in oxy-coal burners. In this research, a pure oxygen stream was dedicated to the burner in order to investigate the effects of directed pure oxygen injection. This stream might contain a specific fraction of or all the oxygen required for combustion. The consequences of segregating all the input oxygen into one stream composed of 100% oxygen were determined using the co-axial burners with different oxygen stream configurations. Flame stability measurements were taken to evaluate the differences. Flame stability was quantified through flame probability density functions (PDF) of the stand-off distance (determined using photo-imaging techniques). The results led to determination of mechanistic concepts of flame stability in burners with directed oxygen injection. The PDFs obtained from these simplified prototype configurations led to physical insight into flame stabilization mechanisms. Flames with a pure oxygen stream in the center annulus are more stable than those with oxygen in the center pipe. Further investigation of this study added to the general knowledge of coal jet attachment mechanisms and the significant effects of fine coal particles and their radial transportation by large eddies on flame stability.
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Rights This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee.
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ARK ark:/87278/s6hq42hg
Setname uu_afrc
Date Created 2013-02-13
Date Modified 2021-05-06
ID 14341
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