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Chemical and structural analyses of aerosols and fly-ash particles from fixed-bed biomass combustion plants by electron microscopy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Brunner, Thomas W. Dahl, Jonas Obernberger, Ingwald Pölt, P. |
| Copyright Year | 2001 |
| Abstract | The interest in the mechanisms governing the formation of coarse fly-ash and aerosol particles in biomass combustion processes has constantly increased during the past few years. Besides ash and aerosol sampling with subsequent wet chemical analyses and theoretical mathematical modelling, electron microscopy has turned out to be a valuable and efficient method in this field of science. In this work, results from analyses by scanning electron microscopy and energy dispersive X-ray spectrometry performed on aerosol and fly-ash samples from the flue gas of biomass combustion units are presented. Comparing the results from the analyses of samples from test runs with different kinds of biomass fuels, it becomes obvious that the submicron and the coarse mode of the particulates show remarkable differences in shape and composition. While the submicron particles mainly consist of K, Na, S, Cl and heavy metals like Zn and Pb, the main compounds of the coarse mode are refractory species like Ca, Si, Mg and Al. Submicron particles are spheres or crystals while the coarse fly ash particles are amorphous (if molten) or consist of a grid built up by refractory species on which smaller particles agglomerated. This difference between the two modes is due to their different formation mechanisms. The analytical results correspond well with results achieved from experimental and theoretical work in the field of aerosol and fly-ash formation. |
| Starting Page | 1991 |
| Ending Page | 1994 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.bios-bioenergy.at/uploads/media/Paper-Brunner-AnalysesOfAerosolsAndFlyAshes2001-07-20_01.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
