Warianty tytułu
Języki publikacji
Abstrakty
In order to prevent operational problems arising from ash deposition, through comprehension of the phenomena taking place within the furnace, appropriate sampling and characterization of the deposits are necessary. One of the most common approaches for the assessment of operational problems related to ash deposition is based on determining the fusion behavior of ash by measurement of its sintering temperature. In this paper are presented the results of mechanical, thermal and electrical measurements of the ash samples prepared from brown and bituminous coal, some sewage sludge and biomass. The sintering tendency of the ashes was based on the chemical analysis, Ash Fusion Test data and Equilibrium Phase Diagrams. The sintering temperature is here determined by the change in the resistivity of ash while heated at a constant rate. On the basis of these experiments results, it was made the correlation between the ashes sintering temperature and electrical resistivity of the samples. It was observed the significant changes of the electrical resistivity during the heating process. To explain the electrical characteristics of the sample, some thermodynamic calculation was made and the equilibrium phase was determined. The characteristic resistivity changes were correlated with the equilibrium phases formed during heating process.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
177-191
Opis fizyczny
Bibliogr. 9 poz., rys.
Twórcy
autor
autor
autor
autor
- Wrocław University of Technology, Institute of Heat Engineering and Fluid Mechanics, dorota.nowak-wozny@pwr.wroc.pl
Bibliografia
- [1] Frenkel J., J., Viscous Flow of Crystalline Bodies Under the Action of Surface Tension, Journ. Phys. (Moscow) 9, 385 (1945)
- [2] Raask E., Sintering characteristics of coal ashes by simultaneous dilatometry-electrical conductance measurements, Journal of Thermal Analysis, 16 (1979) 91-102
- [3] Ahn Y.C., Lee J.K., Physical, chemical and electrical analysis of aerosol particles generated from industrial plants, Aerosol Science 37 (2006) 187-202
- [4] Al-Otoom, A.Y., Elliott L.K., Wall T.F., Monghtaderi B., Measurement of the sintering kinetics of coal ash, Energy&Fuels 14 (2000) 994-1001
- [5] Nutalapati D., Gupta R., Moghtaderi B., Wall T.F., Assessing slagging and fouling during biomass combustion: A thermodynamic approach allowing for alkali/ash reactions, Fuel processing 88 (2007) 1044-1052
- [6] Zevenhoven-Onderwater M., Backam R., Bengt-Johan Skifvars, Hupa M., The ash chemistry in fluidised bed gasification of biomass fuels. Part I: predicting the chemistry of melting ashes and ash-bed material interaction, Fuel 80 (2001) 1489-1502
- [7] Bengt-Johan Skifvars, Backam R., Hupa M, Characterization of the sintering tendency of ten biomass ashes in FBC conditions by a laboratory test and by phase equilibrium calculations, Fuel processing Technology 56 (1998) 55-67
- [8] Fryda L.E., Panopoulos K.D., Kakaras E., Agglomeration in fluidised bed gasification of biomass, Powder technology 181 92008) 307-320
- [9] Blander M., Milne T.A., Dayton D.C., Backman R., Blake D., Kuhnel V., Liniak W., Nordin A., Ljung A., Equilibrium chemistry of biomass combustion: A Round-Robin set of calculations using available computer programs and databases, Energy&Fuels 15 (2001) 344-349
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BWM4-0030-0041