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Title	Ash Deposition as a Function of Coal Type, Location in a Boiler, and Boiler Operating Conditions: Predictions Compared To Observations
Creator	Baxter, L. L.; DeSollar, Richard W.
Publisher	Digitized by J. Willard Marriott Library, University of Utah
Date	1991
Spatial Coverage	presented at Honolulu, Hawaii
Abstract	A mechanistic model of ash deposition is compared with pilot- and utility-scale experiments. The model is based on the transformations of mineral species in coal during transport of particles through an arbitrary combustion environment. Quantitative model predictions include the elemental composition of boiler ash deposits as a function of location, operating conditions, and coal type. Qualitative predictions relating to practical aspects of boiler operation are also included. Comparisons of model predictions with experimental results at pilot and utility scales are presented. A three-week utility test burn of a Wyoming (Hanna Basin) coal in a boiler designed for midwestern and eastern coal is described. The test burn occurred in the tangentially fired boiler of a 600 MWe power plant located in illinois. Data acquired from the test bum include deposit accumulation rate, strength and morphology, removability, emissivity, and elemental composition. Deposit samples were collected during and after the test burn for comparison with model predictions. Ash deposit removability, as indicated by soot blower effectiveness, was monitored during the test burn. Deposit strength is indicated by friability of deposits collected during a boiler inspection following the test bum. Deposit emissivity was qualitatively determined by monitoring the furnace exit gas temperature. Similar data are also reported from the Sandia multifuel combustor, a pilot-scale facility. Experimental observations and data are compared with model predictions. Deposits from the Wyoming coal were observed to accumulate at about the same rate as those from the fuel used previously in this boiler. The deposits from the Wyoming coal were granular and friable (had little strength). They were easily removed from boiler heat transfer surfaces by normal soot blowing practices. They were light colored and highly reflective. All of these qualitative trends are consistent with model predictions. The measured elemental composition of the ash deposits from the Wyoming coal is within approximately 5 % (absolute) of the predicted composition.
Type	Text
Format	application/pdf
Language	eng
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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/s6m0482t
Setname	uu_afrc
ID	6871
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6m0482t

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Title	Page 14
Format	application/pdf
OCR Text	Show 4. Durant, J.F., A.F. Kwasnik, and G.F. Lexa, "Impacts of Cleaning Texas Lignite on Boiler Performance and Economics," EPRI Final Report, GS-6517, Research Project 2425-1, (1989). 5. Loehden, D., P.M. Walsh, A.N. Sayre, I.M. Beer, and A.F. Sarofim, "Generation and Deposition of Fly Ash in the Combustion of Pulverized Coal," Journal of the Institute of Energy, pp. 119-127 (1989). 6. Harding, N.S. and M.C. Mai, "Elemental Partitioning During Pilot-Scale Combustion Tests - Effects on Ash Deposit Composition," in Mineral Matter and Ash Deposition from Coal, R.W. Bryers and K.S. Vorres ed. United Engineering Trustees, Inc. pp. 375 (1990). 7. Srinivasachar, S., 1.1. Helble, C.B. Katz, and A.A. Boni, Proceedings of the Twenty-Third Conference (International) on Combustion, The Combustion Institute, Pittsburgh (in press) (1990). 8. Baxter, L.L., "Ash Composition Prediction as a Function of Coal Type, Operating Conditions, and Boiler Location," proceedings of the EPRI conference on the Effects of Coal Quality on Power Plants, S1. Louis, Missouri, September 19-21, (1990). 9. Boni, A.A., Beer, J.M., Bryers, R.W., Flagan, R.C., Helble, 1.1., Huffman, G.P., Huggins, F.E., Peterson, T.W., Sarofim, A.F., Srinivasachar, S., and Wendt, 1.0.L., "Transformations of Inorganic Coal Constituents in Combustion Systems," Phase I Draft Final Report, US DOE Contract No. CE-AC22-86PC90751, March, (1990). 10. Zygarlicke, C.J., S.A. Benson, D.L. Toman, E.N. Steadman, D.W. Brekke, T.A. Erickson, and J.P. Hurley, "Combustion Inorganic Transformations," Annual Technical Progress Report, US DOEIPETC Cooperative Agreement No. DE-FC21-86MC10637, October, (1990). 11. Friedlander, S.K. and H.F. Johnstone, "Deposition of Suspended Particles from Turbulent Gas Streams," Industrial and Engineering Chemistry 49: 1151-1156 (1957). 12. Rosner, D.E., and M. Tassopoulos, "Deposition Rates from Polydispersed Particle Populations of Arbitrary Spread," AlChE Journal 35:1497-1508 (1989). 13. Baxter, L.L., "Task 3: Fate of Mineral Matter During Pulverized Coal Combustion," in "Coal Combustion Science: Quarterly Progress Report," Hardesty, D.R., ed., Sandia Report SAND-8217, May, (1991). 14. Baxter, L.L., "Task 3: Fate of Mineral Matter During Pulverized Coal Combustion," in "Coal Combustion Science: Quarterly Progress Report," Hardesty, D.R., ed., Sandia Report SAND-8247, November, (1990b). 15. Baxter, L.L., and R.E. Mitchell, "The Release of Iron During the Combustion of lllinois #6 Coal," to appear in Combustion and Flame , (1991) . 14
Setname	uu_afrc
ID	6868
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6m0482t/6868