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Title	Single Particle Experiments for the Investigation of Unburned Carbon in Flyash
Creator	Davis, Kevin A.; Hurt, Robert H.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1994
Spatial Coverage	presented at Maui, Hawaii
Abstract	Recent industrial attempts to meet increasingly tight emissions restrictions have led to difficulties in maintaining acceptably low levels of unburned carbon in boiler flyash. The significance of this problem is not limited to the obvious loss of efficiency and may become more important in the future because of flyash recycling vs. disposal issues. This paper is a summary of the single particle work done at Sandia's Combustion Research Facility to address this issue. Two experimental techniques (an entrained flow reactor equipped with optical diagnostics, and a high resolution captive-particle imaging technique) are used to evaluate several issues related to char reactivity under pulverized-coal combustion conditions. This paper demonstrates that single particle laboratory studies can yield useful insights into the origin and causes of unburned carbon in flyash. Experimental results indicate that variation of char reactivity during combustion and, under certain conditions, the difference in reactivity from particle-to-particle can have a significant impact upon the time required to reach high levels of conversion. We have observed a loss of reactivity during the intermediate stages of char combustion for several bituminous coals, but not for low rank fuels (subbituminous coals, lignites, biomass).
Type	Text
Format	application/pdf
Language	eng
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.
Conversion Specifications	Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth.
Scanning Technician	Cliodhna Davis
ARK	ark:/87278/s6nz8b6x
Setname	uu_afrc
ID	9623
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6nz8b6x

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Title	Page 13
Format	application/pdf
OCR Text	Show 13 Hurt, R.H. (1993). Energy and Fuels 7:721. Hurt, R.H. and Davis, K.A. (1994). in the 25th Symposium (International) on Combustion, The Combustion Institute. Hurt, R.H., Davis, K.A. and Hardesty, D.R. (1993a). Coal Combustion Science--Quarterly Progress Report, Sandia Technical Report No. 94-8231, April-June. Hurt, R.H., Davis, K.A. and Hardesty, D.R. (1993b). Coal Combustion Science--Quarterly Progress Report, Sandia Technical Report No. 94-8215, January-March. Hurt, R.H., Davis, K.A., Yang, N.Y.C. and Headley, T.H. (1994). in press, Fuel. Hurt, R.H. and Gibbins, J.R. (1994). in press, Fuel. Hurt, R.H., Longwell, J.P. and SaroflID, A.F. (1986). Fuel 65:451. Hurt, R.H. and Mitchell, R.E. (1992). In the 24th Symposium (International) on Combustion, The Combustion Institute, p. 1243. Mitchell, R.E., Hurt, R.H., Baxter, L.L. and Hardesty, D.R. (1992). Compilation of Sandia coal char combustion data and kinetic analyses: milestone report, Sandia Report No. SAND92-8208. Mitchell, R.E., Tsai, N.K. and Morris, C.l. (1993). poster presentation at the 7th International Conference on Coal Science. Monroe, L.S., Clarkson, R.J. and Stallings, J.W. (1994). In The Effects of Coal Quality on Power Plants, EPRI. Morley, C. and R.B., J. (1986). In 21st Symposium (International) on Combustion, The Combustion Institute, p. 239. Oka, N., Marayama, T., Matsuoka, H., Yamada, S., Yamada, T., Shinozaki, S., Shiboaka, M. and Thomas, C.G. (1987). Fuel Processing Technology 15:213. Thomas, C.G., Shiboaka, M., Gawronski, E., Gosnell, M.E. and Phong-anant, D. (1993). Fuel 72:913. Tichenor, D.A., Mitchell, R.E., Hencken, K.R. and Niksa, S. (1984). In the 20th Symposium (International) on Combustion, The Combustion Institute, p. 1249. Valix, M.G., Harris, D.J., Smith, l.W. and Trimm, D.L. (1992). In the 24th Symposium (International) on Combustion, The Combustion Institute, p. 1217. Vleeskens, 1.M. and Nandi, B.N. (1986). Fuel 65:797.
Setname	uu_afrc
ID	9616
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6nz8b6x/9616