http://www.cnr.it/ontology/cnr/individuo/prodotto/ID229037
The relevance of attrition to the fate of ashes during fluidized bed combustion of a biomass (Articolo in rivista)
- Type
- Label
- The relevance of attrition to the fate of ashes during fluidized bed combustion of a biomass (Articolo in rivista) (literal)
- Anno
- 2000-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/S0082-0784(00)80638-4 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- R. Chirone, P. Salatino, F. Scala (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Dipartimento di Ingegneria Chimica - Università degli Studi di Napoli \"Federico II\"
Istituto di Ricerche sulla Combustione - C.N.R. (literal)
- Titolo
- The relevance of attrition to the fate of ashes during fluidized bed combustion of a biomass (literal)
- Abstract
- The fate of ashes during the fluidized-bed combustion of a biomass fuel (Robinia pseudoacacia) has
been investigated both experimentally and theoretically. Fluidized-bed combustion experiments with Robinia
have been carried out with a bed of pure quartz at temperatures ranging from 700 ?C to 850 ?C at
different oxygen concentrations in order to investigate the tendency of the biomass ashes to deposit on
the bed particles and to give rise to bed agglomeration. SEM/EDX analysis of the silica bed particles after
the tests was carried out to determine the formation of alkali-rich layers on inert bed particles and possibly
of silicate melts. Results indicated that large quantities of biomass ashes are retained on the bed particles
under all operating conditions, but only at the higher temperatures could molten surface layers and agglomerated
bed particles be noticed.
Experimental results have been interpreted on the basis of a single-particle combustion model applied
to both fine and coarse char particles' burnout in a fluidized bed. Calculations show that extremely high
temperatures are rapidly reached by fine particles even at very low oxygen concentrations. These temperatures
are well beyond typical potassium silicate melting temperatures. On the other hand, coarse
particles burn at temperatures only slightly above bed temperature.
Experimental and theoretical results indicate that the following mechanism is relevant to the fate of
ashes during fluidized-bed combustion of biomass: ash is mostly detached from the coarse char as attrited
fines whose temperature is raised significantly by carbon afterburning. Fines can further adhere onto inert
bed particles, with formation of alkali-rich surface layers. If the bed temperature is higher than the alkalisilicate
eutectic, a melt forms that enhances bed particle stickiness and may ultimately lead to bed agglomeration. (literal)
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- Autore CNR
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