PARALLEL- AND SERIES-REACTION MECHANISMS OF WOOD AND CHAR COMBUSTION (Articolo in rivista)

Type
Label
  • PARALLEL- AND SERIES-REACTION MECHANISMS OF WOOD AND CHAR COMBUSTION (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Alternative label
  • Carmen BRANCA and Colomba Di BLASI (2004)
    PARALLEL- AND SERIES-REACTION MECHANISMS OF WOOD AND CHAR COMBUSTION
    in Thermal science
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Carmen BRANCA and Colomba Di BLASI (literal)
Pagina inizio
  • 51 (literal)
Pagina fine
  • 63 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 8 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 2 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento Ingegneria Chimica, Università degli Studi di Napoli \"Federico II\" (literal)
Titolo
  • PARALLEL- AND SERIES-REACTION MECHANISMS OF WOOD AND CHAR COMBUSTION (literal)
Abstract
  • Thermogravimetric curves in air of beech wood and char, ob tained from con ven tional py rol y sis of beech wood at a lab o ra tory scale, have been re-ex am ined us ing dif fer ent ki netic mod els. Multi-step re ac tion mech a - nisms, con sist ing of ei ther four (wood) or two (char) re ac tions are needed for ac cu rate pre dic tions of weight loss curves. In the case of wood, three re - ac tions are lin ear in the re ac tant mass frac tion whereas the fourth step pres ents a power-law de pend ence. A lin ear re ac tion for devolatilization and a non-lin ear re ac tion for com bus tion are used for the weight loss curves of char. It has been found that ac ti va tion en er gies and pre-ex po nen tial fac - tors are in vari ant with se ries- or par al lel-re ac tions, pro vid ing changes in the stoichiometric co ef fi cients. Fur ther more, the ac ti va tion en er gies of the two re ac tions oc cur ring at higher tem per a tures in the four-step mech a nism (wood) and those of the two-step mech a nism (char) are the same. Thus, pre-ex po nen tial fac tors and re ac tion or der take into account variations in the char reactivity derived from different pyrolysis conditions. (literal)
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