Abstract
Ash related problems cost the US utility industry up to $8.7 billion per year. A part of this cost is caused by slagging. Empirical techniques to predict slagging have not been successful. More fundamentally based techniques are being developed. At this point, the practical application of the more fundamentally based techniques need to be demonstrated.
This paper reviews the causes of difficult deposits and recommends work that might help control slag in boilers. This paper starts with a deposit that can not be removed and analyzes the cause of this difficulty working backward. We start with soot blowing, proceed to deposit temperature, deposit strength, deposit building, and end with deposit initiation.
Finally, we recommend studies on soot blowing. This effort is aimed not only at determining the mechanism of soot blowing but optimizing practical soot blowing. We also recommend studies on the causes of difficult, plastic, and hard to remove deposits.
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References
Barnes, D.I., Lewit, M.W., and Smith, M. (1994), “ The Slagging Behavior of Three UK Power Station Coals in an Ash Deposition Rig.” in J. Williamson and F. Wigley (Eds.), The Impact of Ash Deposition on Coal Fired Plants, London: Taylor and Francis.
Blander, M. and Pelton, A.D. (1986), “ Analyses of Thermodynamic Properties of Molten Slags.” In K.S. Vorres (ed.), Mineral Matter and Ash in Coal Washington, DC, American Chemical society Symposium Series 301.
Boni, A.A, Beer, J.M., Bryers, R.W., Flagan, R.C., Helble, J.J., Huffman, G.P., Peterson, T.W., Sarofim, A.F., Srinivasachar, S. Wendt, J.O.L. (1990), “ Transformations of Inorganic Coal Constituents in Combustion Systems.” DOE Contract No. DE-AC22–86PC90751.
Creek,R.C. and Becker, H.B. (1985), “ Thermal Properties of Boiler Ash Deposits.” NERDDP Project 593 Report ND/85/014 Melbourne, Australia, State Electricity Commission of Victoria.
Fewster, M., Juniper, L. Ottrey, A., Creelman, R. and Pohl, J. (1994), “ Plant Investigation of Slagging at Callide Power Station.” Pacific Rim International Conference on Environmental Control of Combustion Processes Maui, HI: American and Japanese Flame Research Committees, October.
Juniper, L.A., Pohl, J., Ottrey, A., Creelman, R., Wall, T., Kent, J., Griss, R. (1993), “ Slagging Investigations at Callide B Power Station.” Queensland Electricity Commission, Contract No. CC/92/269 Brisbane, Australia.
Juniper, L.A. and Pohl, J.H. (1995), “ Design of Pilot Scale Rigs to Simulate Combustion Processes.” The Australian Combustion Symposium including The Fourth Australian Flame Days Adelaide, Australia.
Kalmanovich, D.P. and Williamson, J. (1986), “ Crystallization of Coal Ash Melts.” In K.S. Vorres (ed.), Mineral Matter and Ash in Coal Washington, DC, American Chemical society Symposium Series 301.
Moore, G.F. and Ehrler, R.F. (1973), “ Western Coals-Laboratory Characterization and Field Evaluations of Cleaning Requirements.” ASME Paper 73-WA/FU-1.
Nowok, J.W. and Benson, S.A. (1992), “ Correlation of Interfacial Surface Tension/Viscosity Ratio with Base/ Acid Ratio.” In S.A. Benson (Ed.), Inorganic Transformations and Ash Deposition During Combustion New York: Engineering Foundation.
Pohl, J.H. (1992), “ The Causes, Prediction and Control of Slagging in Utility Boilers.” 2nd Australian Workshop on Ash Deposition Brisbane, Australia.
Pohl, J.H. (1995), “ Electricity Cost Related to Ash.” Prepared for the American Society of Mechanical Engineers Research Committee on Corrosion and Deposits from Combustion Gases Washington, DC.
Raask, E. (1986), “ Deposition Constituent Phase Separation and Adhesion.” In K.S. Vorres (ed.), Mineral Matter and Ash in Coal Washington, DC, American Chemical society Symposium Series 301.
Singer, J.G. (1981), Combustion: Fossil Power Systems. Windsor, CT: Combustion Engineering, Inc.
Sinha, S., Natesan, K. and Blander, M. (1990), “ A New Calculation Method for Deducing the Complex Chemistry of Coal Ash Deposits.” R.W. Bryers and K.S. Vorres (eds.), Mineral Matter and Ash Deposition from Coal New York: United Engineering Trustees, Inc.
Wagoner, C.L. and Yan, X.-X. (1992), “ Deposit Initiation via Thermophoresis: Part 1, Insight on Deceleration and Retention of Inertially Transported Particles.” In S.A. Benson (Ed.), Inorganic Transformations and Ash Deposition During Combustion New York: Engineering Foundation.
Wain, S.E., Sanyal, A., Livingston, W.R., and Williamson (1992), “ Thermal and Mechanical Properties of Boiler Slags of Relevance to Soot Blowing.” In S.A. Benson (Ed.), Inorganic Transformations and Ash Deposition During Combustion New York: Engineering Foundation.
Wall, T.F., Bhattacharya, S.P., Zhang, D.K., Gupta, R.P. (1994), “ The Properties and Thermal Effects of Ash Deposits in Coal-Fired Furnaces: A Review.” in J. Williamson and F. Wigley (Eds.), The Impact of Ash Deposition on Coal Fired Plants, London: Taylor and Francis
van der Vort, C.L. (1992), “ Factors Influence Ash Particle Depositions in a Separator at High Velocities Temperatures.” S.A. Benson (ed.), Inorganic Transformations and Ash Deposition During Combustion New York: Engineering Foundation.
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© 1996 Springer Science+Business Media New York
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Pohl, J.H., Juniper, L.A. (1996). Slagging: Problem Definition. In: Baxter, L., DeSollar, R. (eds) Applications of Advanced Technology to Ash-Related Problems in Boilers. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9223-2_38
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DOI: https://doi.org/10.1007/978-1-4757-9223-2_38
Publisher Name: Springer, Boston, MA
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