Sintering characteristics of selected Silesian coal ashes

• Autorzy: Nowak-Woźny D. , Ferens W. , Gonzalez-Valdes L. , Rybak W.
• Języki publikacji: EN

Abstrakty

EN

Standard techniąues and microscopic studies (CCSEM/ SEM-EDS) together with AC electrical test and FactSage modelling were used for testing the sintering characteristics of three different Silesian's coal ashes. The thermodynamic calculations by FactSage were performed using different initial conditions in order to assess the influence of input data. Whereas the predicted solid phases differ, the results regarding slag phase formation are practically independent. For the tested samples it was found a correlation between the standard ST temperaturę (AFTs) and the results of FactSage modelling. The slagging and fouling tendencies were found inverted. The results indicate that the microstructure of the individual ash grains have an impact on the sintering process. The value of measured dissipation factor (tan S) depends on the kind of ash and the sintering temperaturę. The presented results point a promising direction for coal ash fusion behaviour and coal minerał matter transformation research.

Słowa kluczowe

EN

coal; mineral matter; slagging; ash fusion behaviour; dissipation factor

• Wydawca: Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archivum Combustionis
• Rocznik: 2018
• Tom: Vol. 38 nr 1
• Strony: 11--28
• Opis fizyczny: Bibliogr. 32 poz., rys., tab.

Twórcy

autor

Nowak-Woźny D.

• Wrocław University of Science and Technology Faculty of Mechanical and Power Engineering Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Ferens W.

• Wrocław University of Science and Technology Faculty of Mechanical and Power Engineering Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

autor

Gonzalez-Valdes L.

• Wrocław University of Science and Technology Faculty of Mechanical and Power Engineering Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland, tel. [phone]

autor

Rybak W.

• Wrocław University of Science and Technology Faculty of Mechanical and Power Engineering Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Bibliografia

• [1] Bryers, R.W. 1996. Fireside slagging, fouling, and high-temperature corrosion of heat-transfer Surface due to impurities in steam-raising fuels. Prog. Energy Combust. Sci., 22, 29.
• [2] Caua, G., Tolaa, V., and Bassano, C. 2015. Performance evaluation of highsulphur coalred USC plant integrated with SNOX and C02 capture sections. Appl. Therm. Eng., 74, 136.
• [3] Wen, C, Xu, M, Zhou, K., Yu, D., Zhan, Z., and Mo, X. 2015. The melting potential of various ash components generated from coal combustion: Indicated by the circularity of individual particles using CCSEM technology. Fuel Process. Technol., 133, 128.
• [4] Gupta, S. K., Wall, T.F., Creelman, R.A. and Gupta, R.P. 1998. Ash fusion temperatures and the transformations of coal ash particles to slag. Fuel Process. Technol., 56, 33.
• [5] Yan, L., Gupta, R., and Wall, T. 2001. The implication of minerał coalescence behavior on ash formation and ash deposition during pulverized coal combustion. Fuel, 80, 1333.
• [6] Demirbas, A. 2005. Potential applications of renewable energy sources, biomass combustion problems in boiler power system and combustion related environmental issues. Prog. Energ. Combust., 31, 171.
• [7] Fernandez, R.G., Garcia, C.P., Lavin, A.G. and De las Heras, J.L.B. 2012. Study of main combustion characteristics for biomass fuels used in boilers. Fuel Process. Technol., 103, 16.
• [8] Magdziarz, A., Wilk, M., Gajek, M., Nowak-Wozny, D., Kopia, A., Kalembarec, I., Koziński, J.A. 2016a. Properties of ash generated during sewage sludge combustion: A multifaceted analysis. Energy, 113,85.
• [9] Magdziarz, A., Nowak-Wozny, D., Gajek, M., Wilk, M. 2016b. Minerał phase transformation of biomass ashes - thermal analysis and FactSage calculations. Proceedings of ECOS 2016 - the 29th International Conference on Eficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, June 19-23. 2016 Portro. Slovenia.
• [10] Creelman, R.A., Ward, C.R., Schumacher, G. and Juniper, L. 2013. Relation between Coal Minerał Matter and Deposit Mineralogy in Pulverized Fuel Furnaces. Energy Fuels, 27, 5714.
• [11] Van Dyk, J. C, Benson, S.A., Laumb, M.L. and Waanders, B. 2009. Coal and coal ash characteristics to understand minerał transformations and slag formation. Fuel, 88(6), 1057.
• [12] Jak, E. 2002. Prediction of coal ash fusion temperaturę with the FACT thermodynamic computer package. Fuel, 81, 1655.
• [13] Barroso, J., Ballester, J. and Pina, A. 2007. Study of coal ash deposition in an entrained flow reactor: Assessment of traditional and alternative slagging indices. Fuel Process. Technol., 88, 865.
• [14] Van Dyck, J. C, Keyser, M. J. 2014. Influence of discard minerał matter on slag liquid formation and ash melting properties of coal: A FACTSAGETM simulation study. Fuel, 116, 834.
• [15] Silva LFO, Sampaio CH, Guedes A, Fdez-Ortiz de Vallejuelo S, Madariaga JM. Multianalytical approaches to the characterisation of minerals associatedwith coals and the diagnosis of their potential risk by using combined instrumentalmicrospectroscopic techniąues and thermodynamic speciation. Fuel 2012; 94: 52-63.
• [16] Vassilev, S. V. andTascon, J. M. D. 2003. Methods for characterization of inorganic and minerał matter in coal: a critical overview. Energy Fuels, 17, 271.
• [17] Benson, S. A. and Sondreal, E. A. 1999. Ash-related issues during combustion and gasification. ed. R. P. Gupta, T. F. Wall and L. Baxter, Springer US, New York, lst edition, chapter 1, 1-21.
• [18] Nowak-Wozny, D., Moron, W., Hrycaj, G. and Rybak, W. 2013. Electrical Properties of the sintered biomass, sewage sludge and coal ash. Electrotechnical Review, 89(2a), 75.
• [19] Samal, S., Ray, A. K. and Bandopadhyay, A. 2015. Characterization and microstructure observation of sintered red mud-fly ash mixtures at various elevated temperaturę. J. Clean. Prod., 101, 368.
• [20] Gupta, R. 2007. Advanced Coal Characterization: A Review. Energy Fuels, 21, 451.
• [21] Bale, C.W., Belisle, E., Chartrand, P., Decterov, S. A., Eriksson, G., Hack, K. et al. 2009. FactSage Thermochemical Software and Databases Recent Developments. Calphad, 33, 395.
• [22] Lindberg, D., Backman, R., Chartrand, P., Hupa, M. 2013. Towards a comprehensive thermodynamic database for ash-forming elements in biomass and waste combustion - Current situation and futurę developments. Fuel Process. Technol., 105, 129.
• [23] Nowok, J. W., Hurley, J. P. and Benson, S. A. 1998. The role of physical factors in mass transport during sintering of coal ashes and deposit deformation near the temperaturę of glass transformation. Fuel Process. Technol., 56, 89.
• [24] Nowak-Woźny, D., Janiczek, T., Mielcarek, W. and Gajewski, J. B. 2009. Fractional electrical model for modified bismuth oxide. J. Electrostat., 67, 1821.
• [25] Carpenter, G. 1994. Understanding slagging and fouling in pf combustion. IEA Clean Coal Centrę, 1-1109.
• [26] Seggiani, M. 1999. Empirical correlations of the ash fusion temperatures and of critical viscosity for coal and biomass ashes. Fuel, 78, 1121.
• [27] Pronobis, M., Kalisz, S., Polok, M. 2013. The impact of coal characteristics on the fouling of stoker-fired boiler convection surfaces. Fuel, 112, 473.
• [28] Slegier, W. A., Singletary, J. H. and Kohut, J. F. 1998. Application of a microcomputer to the determination of coal ash fusibility characteristics. J. Coal Quality, 7(2), 48.
• [29] Marland, S., Merchant, A. and Rowson, N. 2001. Dielectric properties of coal. Fuel, 80, 1839.
• [30] Jung, B. 1996. Sintering characteristics of low-rank coal ashes. Korean J. of Chem. Eng., 13(6), 633.
• [31] Frenkel, J. 1945. Viscous flow of crystalline bodies underthe action of surface tension. J. Phys. USSR, 9,385.
• [32] Raask, E. 1979. Sintering characteristics of coal ashes by simultaneous dilatometry-electrical conductance measurements. J. Therm. Anal., 16, 91.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).