Documents disponibles écrits par cet auteur

Batch reactors for hydrogen production / David L. Damm in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5610–5623 Titre : Batch reactors for hydrogen production : theoretical analysis and experimental characterization Type de document : texte imprimé Auteurs : David L. Damm, Auteur ; Andrei G. Fedorov, Auteur Année de publication : 2009 Article en page(s) : pp. 5610–5623 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Transient  batch-style  reactors  Hydrogen  production Résumé : Transient batch-style reactors (CHAMP) were recently shown to be an attractive alternative to continuous-flow reactors for hydrogen production in portable and distributed applications, and idealized kinetic reactor models were used to analyze the performance characteristics. Here, we expand this analysis with the development of a comprehensive batch reactor model which accounts for the effects of mass transport limitations on reactor performance. The relationships between system design parameters and the rate-limiting processes that govern reactor output are identified and mapped out. Additionally, two modes of operation of either constant-volume or constant-pressure reactors are investigated. In constant-volume mode, the residence time is precisely controlled to reach a desired operating state in a trade-off between efficiency and power output without compressing the content of the reaction chamber. In constant-pressure mode, the volume of the reactor is actively reduced by moving a piston along the trajectory that maintains the operating pressure at its maximum allowable value thus enhancing the reactor throughput. Complementary to the theoretical analysis, we report on the development and experimental characterization of two test reactors. The first reactor is a constant-volume batch reactor (no permeable membrane) and provides data on the transient evolution of species concentrations within the reaction chamber. The second reactor incorporates a hydrogen permeable membrane and allows for both constant-volume and variable-volume operation. The experimental data obtained using these reactors are used to validate the predictive value of the reactor model developed in the present study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015126 [article] Batch reactors for hydrogen production : theoretical analysis and experimental characterization [texte imprimé] / David L. Damm, Auteur ; Andrei G. Fedorov, Auteur . - 2009 . - pp. 5610–5623. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5610–5623 Mots-clés : Transient  batch-style  reactors  Hydrogen  production Résumé : Transient batch-style reactors (CHAMP) were recently shown to be an attractive alternative to continuous-flow reactors for hydrogen production in portable and distributed applications, and idealized kinetic reactor models were used to analyze the performance characteristics. Here, we expand this analysis with the development of a comprehensive batch reactor model which accounts for the effects of mass transport limitations on reactor performance. The relationships between system design parameters and the rate-limiting processes that govern reactor output are identified and mapped out. Additionally, two modes of operation of either constant-volume or constant-pressure reactors are investigated. In constant-volume mode, the residence time is precisely controlled to reach a desired operating state in a trade-off between efficiency and power output without compressing the content of the reaction chamber. In constant-pressure mode, the volume of the reactor is actively reduced by moving a piston along the trajectory that maintains the operating pressure at its maximum allowable value thus enhancing the reactor throughput. Complementary to the theoretical analysis, we report on the development and experimental characterization of two test reactors. The first reactor is a constant-volume batch reactor (no permeable membrane) and provides data on the transient evolution of species concentrations within the reaction chamber. The second reactor incorporates a hydrogen permeable membrane and allows for both constant-volume and variable-volume operation. The experimental data obtained using these reactors are used to validate the predictive value of the reactor model developed in the present study. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015126

Comparative assessment of batch reactors for scalable hydrogen production / David L. Damm 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. 4665–4674 Titre : Comparative assessment of batch reactors for scalable hydrogen production Type de document : texte imprimé Auteurs : David L. Damm, Auteur ; Andrei G. Fedorov, Auteur Année de publication : 2008 Article en page(s) : p. 4665–4674 Note générale : Bibliogr. p. 4673-4674 Langues : Anglais (eng) Mots-clés : Batch  reactors;  Scalable  hydrogen;  Numerical  simulation Résumé : A new concept of a variable volume batch reactor, CO2/H2 active membrane piston (CHAMP), is introduced for scalable hydrogen production for portable and distributed applications. The conceptual design and operating principles of the CHAMP reactor are discussed, aiming at precise control of residence time and optimal performance. A simplified reactor model is formulated, and the operation of the idealized reactor is numerically simulated. In the ideal limit of no heat or mass transfer limitations, the hydrogen yield rate and efficiency of the CHAMP reactor are shown to exceed that of a comparable, traditional continuous-flow (CF) design. In the presence of transport limitations, the relative performance enhancement enabled by the CHAMP reactor is even greater. Additionally, the transient nature of the CHAMP reactor makes it particularly suited for applications with varying power demands, such as in transportation, and its stackable design makes it highly scalable across a wide range of power requirements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800294y [article] Comparative assessment of batch reactors for scalable hydrogen production [texte imprimé] / David L. Damm, Auteur ; Andrei G. Fedorov, Auteur . - 2008 . - p. 4665–4674. Bibliogr. p. 4673-4674 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4665–4674 Mots-clés : Batch  reactors;  Scalable  hydrogen;  Numerical  simulation Résumé : A new concept of a variable volume batch reactor, CO2/H2 active membrane piston (CHAMP), is introduced for scalable hydrogen production for portable and distributed applications. The conceptual design and operating principles of the CHAMP reactor are discussed, aiming at precise control of residence time and optimal performance. A simplified reactor model is formulated, and the operation of the idealized reactor is numerically simulated. In the ideal limit of no heat or mass transfer limitations, the hydrogen yield rate and efficiency of the CHAMP reactor are shown to exceed that of a comparable, traditional continuous-flow (CF) design. In the presence of transport limitations, the relative performance enhancement enabled by the CHAMP reactor is even greater. Additionally, the transient nature of the CHAMP reactor makes it particularly suited for applications with varying power demands, such as in transportation, and its stackable design makes it highly scalable across a wide range of power requirements. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800294y