Risks of boiler operation during slagging and fouling process – a new methods for the determination of ash sintering temperatures

• Autorzy: Urbanek B. , Szydełko A. , Czajka K.
• Języki publikacji: EN

Abstrakty

EN

The properties of mineral matter occurs in coal in the form of inorganic compounds leads to slagging and fouling process on boiler heating surfaces, burners and ash hopper. The deposition of ash cause many undesirable phenomena such as heat transfer deterioration, damage to internal parts of the boiler as a result of detachment of large agglomerates and finally, costly shutdowns of the boiler. Standardized method of risk assessment of agglomerates formation and sintered fly ash is determined by four melting temperatures of ash. This measurement is based on visual appraisal of ash sample deformation which is subjective and strongly depends on the experience of the person conducting the test. Especially is hard predict the first two temperatures: deformation and sintering. An article has to present three non-standardized methods for determining the sintering temperature by using physical parameters: pressure drop and minimum force of probe destruction. This type of measurement allows a quantitative way to obtain reliable and meaningful result. The experiment showed that the results of non-standard methods deviate from those set using the Leitz method. This allows to conclude that sintering processes occur at much lower temperatures and changing the shape of the initial (test method Leitz) is not the first symptom of demonstrating the melting of the ash.

Słowa kluczowe

EN

mineral matter; sintering; fouling; Leitz test; strength method; pressure-drop method

PL

materia mineralna; proces spiekania; zanieczyszczenia; test Leitz; metoda sił; metoda spadku ciśnienia

• Wydawca: Foundation for Young Scientists
• Czasopismo: Challenges of Modern Technology
• Rocznik: 2013
• Tom: Vol. 4, no. 2
• Strony: 47--52
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Urbanek B.

• Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland; Faculty of Mechanical and Power Engineering W-9

autor

Szydełko A.

• Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland; Faculty of Mechanical and Power Engineering W-9

autor

Czajka K.

• Wroclaw University of Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland; Faculty of Mechanical and Power Engineering W-9

Bibliografia

• [1] W.Moroń, W.Ferens, W.Rybak,Determination of the sintering of ash as an indicator of slagging, fouling and agglomeration in boilers,University of technology Wroclaw, Poland.
• [2] W.Moroń, W.Ferens, W.Rybak, K.Król, Sintering characteristics of coal and biomass, University of technology Wroclaw, 2010, Poland.
• [3] S.Jasieńka, Chemistry and physics of coal, PolitechnikaWrocławskaWrocław 1995, Poland.
• [4] J. Szpyrka, Technical examination and quality determination of coal, PolitechnikaŚląska, 2007 Poland.
• [5] E.Raask, Mineral impurities in coal combustion: behavior, problems, and remedial measures, 1985 Washington D.C. USA.
• [6] M. PRONOBIS, Modernizacjakotłówenergetycznych, WNT Warszawa, 2002 Poland.
• [7] Collective work, Wolverine tube heat transfer data book, Wolverine Division of UOP Inc. 2001, USA.
• [8] S.Gupta, T.F.Wall, R.A.Creelman, R.Gupta, Ash fusion temperatures and the transformations of coal ash particles to slag, Departament of Chemical Engineering, University of Newcastle, Callaghan, 1998 Australia.
• [9] J.A.Y.Al-Otoom, L.K.Elliott, T.F.Wall, B.Moghtaderi, Measurement of the Sintering Kinetics of Coal Ash, Cooperative Research Centre for Black Coal Utilization, Department of Chemical Engineering, The University of Newcastle, Callaghan, 2000 Australia.