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Estimating specific chemical exergy of biomass from basic analysis data / Guohui Song in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9758-9766 Titre : Estimating specific chemical exergy of biomass from basic analysis data Type de document : texte imprimé Auteurs : Guohui Song, Auteur ; Laihong Shen, Auteur ; Jun Xiao, Auteur Année de publication : 2011 Article en page(s) : pp. 9758-9766 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass Résumé : Estimation of chemical exergy of biomass is one of the basic steps in performance analysis and optimization of biomass conversion systems. A practical method for estimating specific chemical exergy of biomass on dry basis (db) from basic analysis data was developed on Szargut's reference environment model. The method is based on exergy and entropy equations of reaction, Gibbs free energy relations, a modified estimation of the standard entropy of organic matter in biomass and an assumption about original state of inorganic matter-forming elements in biomass. The method was applied to 86 varieties of biomass, and the statistical results indicate that specific chemical exergy of dry biomass varies in the interval of 11.5―24.2 MJ·kg―1, which is always slightly larger than the higher heat value (HHV) (db). Owing to the relative very small value, the influence of inorganic matter in the form of chemical exergies of ash and oxygen reacting with inorganic matter, and the entropy change in ash formation can be neglected. The average ratio of specific chemical exergy to HHV is 1.047 for dry biomass. Consequently, specific chemical exergy of dry biomass can be conveniently estimated from ultimate analysis data plus ash content (in wt %, db) or HHV. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425221 [article] Estimating specific chemical exergy of biomass from basic analysis data [texte imprimé] / Guohui Song, Auteur ; Laihong Shen, Auteur ; Jun Xiao, Auteur . - 2011 . - pp. 9758-9766. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9758-9766 Mots-clés : Biomass Résumé : Estimation of chemical exergy of biomass is one of the basic steps in performance analysis and optimization of biomass conversion systems. A practical method for estimating specific chemical exergy of biomass on dry basis (db) from basic analysis data was developed on Szargut's reference environment model. The method is based on exergy and entropy equations of reaction, Gibbs free energy relations, a modified estimation of the standard entropy of organic matter in biomass and an assumption about original state of inorganic matter-forming elements in biomass. The method was applied to 86 varieties of biomass, and the statistical results indicate that specific chemical exergy of dry biomass varies in the interval of 11.5―24.2 MJ·kg―1, which is always slightly larger than the higher heat value (HHV) (db). Owing to the relative very small value, the influence of inorganic matter in the form of chemical exergies of ash and oxygen reacting with inorganic matter, and the entropy change in ash formation can be neglected. The average ratio of specific chemical exergy to HHV is 1.047 for dry biomass. Consequently, specific chemical exergy of dry biomass can be conveniently estimated from ultimate analysis data plus ash content (in wt %, db) or HHV. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425221