Documents disponibles écrits par cet auteur

Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide / Lei Wang in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15082-15088 Titre : Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide Type de document : texte imprimé Auteurs : Lei Wang, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur Année de publication : 2013 Article en page(s) : pp. 15082-15088 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Flame  retardant  Combustion Résumé : Ferrous disulfide (FeS2) nanocrystals were synthesized via a simple hydrothermal reaction. The FeS2 nanocrystals were then combined in intumescent flame-retardant ethylene―vinyl acetate (EVA/IFR) systems. Thermogravimetric analysis data indicate that the addition of FeS2 into the EVA/IFR composite can improve the char yields. Cone calorimeter results reveal that FeS2 and IFR can clearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as the heat release rate, total heat release, and so on. Moreover, significant improvements are obtained in the limited oxygen index and Underwriters Laboratories 94 ratings. Laser Raman spectroscopy of residual char shows that the ordered carbon is increased with the addition of FeS2. Scanning electron microscopy demonstrates that FeS2 can help the EVA/IFR system form a dense char layer. The results of dynamic mechanical thermal analyses reveal that FeS2 can increase the glass transition temperature and the storage modulus of EVA/IFR. The mechanism is also proposed in this paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679627 [article] Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide [texte imprimé] / Lei Wang, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur . - 2013 . - pp. 15082-15088. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15082-15088 Mots-clés : Composite  material  Flame  retardant  Combustion Résumé : Ferrous disulfide (FeS2) nanocrystals were synthesized via a simple hydrothermal reaction. The FeS2 nanocrystals were then combined in intumescent flame-retardant ethylene―vinyl acetate (EVA/IFR) systems. Thermogravimetric analysis data indicate that the addition of FeS2 into the EVA/IFR composite can improve the char yields. Cone calorimeter results reveal that FeS2 and IFR can clearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as the heat release rate, total heat release, and so on. Moreover, significant improvements are obtained in the limited oxygen index and Underwriters Laboratories 94 ratings. Laser Raman spectroscopy of residual char shows that the ordered carbon is increased with the addition of FeS2. Scanning electron microscopy demonstrates that FeS2 can help the EVA/IFR system form a dense char layer. The results of dynamic mechanical thermal analyses reveal that FeS2 can increase the glass transition temperature and the storage modulus of EVA/IFR. The mechanism is also proposed in this paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679627

Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system / Yuegui Zhou in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4861–4869 Titre : Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system Type de document : texte imprimé Auteurs : Yuegui Zhou, Auteur ; Weicheng Cao, Auteur ; Lei Wang, Auteur ; Mingchuan Zhang, Auteur Année de publication : 2008 Article en page(s) : p. 4861–4869 Langues : Anglais (eng) Mots-clés : Multifluid  alkaline  spray  generator;  Multiphase  flow;  Desulfurization  system Résumé : A hybrid Eulerian−Lagrangian model was developed to simulate gas−droplet−particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. And the effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 µm and an optimal particle injection location corresponding to the maximum humidification efficiency in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071494c [article] Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system [texte imprimé] / Yuegui Zhou, Auteur ; Weicheng Cao, Auteur ; Lei Wang, Auteur ; Mingchuan Zhang, Auteur . - 2008 . - p. 4861–4869. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4861–4869 Mots-clés : Multifluid  alkaline  spray  generator;  Multiphase  flow;  Desulfurization  system Résumé : A hybrid Eulerian−Lagrangian model was developed to simulate gas−droplet−particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. And the effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 µm and an optimal particle injection location corresponding to the maximum humidification efficiency in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071494c

The impact of metal oxides on the combustion behavior of ethylene – vinyl acetate coploymers containing an intumenscent flame retardant / Lei Wang in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7884-7890 Titre : The impact of metal oxides on the combustion behavior of ethylene – vinyl acetate coploymers containing an intumenscent flame retardant Type de document : texte imprimé Auteurs : Lei Wang, Auteur ; Wei, Yang, Auteur ; Bibo Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 7884-7890 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Flame  retardant  Combustion Résumé : The objective of this work was to compare the flame retardancy of intumescent flame retardant ethylene-vinyl acetate (EVA/IFR) composites containing different metal oxides including lanthanide oxide, iron oxide, the mixture of iron oxide and lanthanide oxide, and lanthanum ferrite nanocrystalline (LaFeO3). A novel compound containing iron and lanthanum, LaFeO3 was successfully prepared. The EVA/IFR composites with these different coadditives were then fabricated through a melt blending process. Thermogravimetric analysis data showed that these different coadditives could increase the char residue formation. Cone calorimeter results revealed that these different coadditives and IFR could dearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as heat release rate, total heat release, average mass loss rate, average smoke extinction area, and so on. Moreover, significant improvements were obtained in limited oxygen index and Underwriters Laboratories 94 ratings. Among all of the samples, the fire risk of EVA/IFR/LaFeO3 system was the lowest. The residue characterization demonstrated that LaFeO3 could promote the formation of the homogeneous and compact intumescent char layer. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990302 [article] The impact of metal oxides on the combustion behavior of ethylene – vinyl acetate coploymers containing an intumenscent flame retardant [texte imprimé] / Lei Wang, Auteur ; Wei, Yang, Auteur ; Bibo Wang, Auteur . - 2012 . - pp. 7884-7890. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7884-7890 Mots-clés : Flame  retardant  Combustion Résumé : The objective of this work was to compare the flame retardancy of intumescent flame retardant ethylene-vinyl acetate (EVA/IFR) composites containing different metal oxides including lanthanide oxide, iron oxide, the mixture of iron oxide and lanthanide oxide, and lanthanum ferrite nanocrystalline (LaFeO3). A novel compound containing iron and lanthanum, LaFeO3 was successfully prepared. The EVA/IFR composites with these different coadditives were then fabricated through a melt blending process. Thermogravimetric analysis data showed that these different coadditives could increase the char residue formation. Cone calorimeter results revealed that these different coadditives and IFR could dearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as heat release rate, total heat release, average mass loss rate, average smoke extinction area, and so on. Moreover, significant improvements were obtained in limited oxygen index and Underwriters Laboratories 94 ratings. Among all of the samples, the fire risk of EVA/IFR/LaFeO3 system was the lowest. The residue characterization demonstrated that LaFeO3 could promote the formation of the homogeneous and compact intumescent char layer. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990302