Documents disponibles écrits par cet auteur

Analysis of a commercial biogas generation system using a gas engine–induction generator set / Wang, Li in IEEE transactions on energy conversion, Vol. 24 N°1 (Mars 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 230 - 239 Titre : Analysis of a commercial biogas generation system using a gas engine–induction generator set Type de document : texte imprimé Auteurs : Wang, Li, Auteur ; Ping-Yi Lin, Auteur Année de publication : 2009 Article en page(s) : pp. 230 - 239 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators;  bioenergy  conversion;  biofuel;  distribution  networks;  eigenvalues  and  eigenfunctions;  electric  drives;  engines;  nonlinear  dynamical  systems;  power  system  dynamic  stability;  shafts;  starting Résumé : This paper presents both field-measured results and dynamic stability analysis of a commercial 100-kW biogas generation system (BGS). The studied BGS consists of a gas engine (GE) and an induction generator (IG) whose mechanical shaft is directly coupled to the crank of the GE. The stator windings of the IG are directly connected to a three-phase, three-wire 380 V, 60 Hz distribution system through a connection cable and an electromagnetic switch. To start up the BGS, the IG is first operated as both an induction motor (IM) and a GE starter to generate sufficient starting torque to start up the GE. The purified biogas mixed with air of proper proportion inside the combustion chamber of the GE is ignited by spark plugs at correct instants to make GE generate sufficient mechanical torque to drive the IG. When the speed of the IG is higher than its synchronous speed, the IG can deliver electrical power to the distribution system. The employed parameters of the studied IG are calculated by using the manufacturer's certification data and comparing both field-test data and simulated results under two specified operating rotational speeds. Dynamic stability analyses of the studied BGS using eigenvalue analysis and nonlinear model simulations under various values of rotational speed and grid voltage are investigated. It can be concluded from the field- measured data and the simulated results of the studied BGS that the studied GE-IG set has a fast response and exhibits stable and easy grid-connection characteristics for converting biogas energy to electrical energy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749291&sortType%3Das [...] [article] Analysis of a commercial biogas generation system using a gas engine–induction generator set [texte imprimé] / Wang, Li, Auteur ; Ping-Yi Lin, Auteur . - 2009 . - pp. 230 - 239. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N°1 (Mars 2009) . - pp. 230 - 239 Mots-clés : Asynchronous  generators;  bioenergy  conversion;  biofuel;  distribution  networks;  eigenvalues  and  eigenfunctions;  electric  drives;  engines;  nonlinear  dynamical  systems;  power  system  dynamic  stability;  shafts;  starting Résumé : This paper presents both field-measured results and dynamic stability analysis of a commercial 100-kW biogas generation system (BGS). The studied BGS consists of a gas engine (GE) and an induction generator (IG) whose mechanical shaft is directly coupled to the crank of the GE. The stator windings of the IG are directly connected to a three-phase, three-wire 380 V, 60 Hz distribution system through a connection cable and an electromagnetic switch. To start up the BGS, the IG is first operated as both an induction motor (IM) and a GE starter to generate sufficient starting torque to start up the GE. The purified biogas mixed with air of proper proportion inside the combustion chamber of the GE is ignited by spark plugs at correct instants to make GE generate sufficient mechanical torque to drive the IG. When the speed of the IG is higher than its synchronous speed, the IG can deliver electrical power to the distribution system. The employed parameters of the studied IG are calculated by using the manufacturer's certification data and comparing both field-test data and simulated results under two specified operating rotational speeds. Dynamic stability analyses of the studied BGS using eigenvalue analysis and nonlinear model simulations under various values of rotational speed and grid voltage are investigated. It can be concluded from the field- measured data and the simulated results of the studied BGS that the studied GE-IG set has a fast response and exhibits stable and easy grid-connection characteristics for converting biogas energy to electrical energy. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4749291&sortType%3Das [...]

Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES / Wang, Li in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 626 - 639 Titre : Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES Type de document : texte imprimé Auteurs : Wang, Li, Auteur ; Shiang-Shong Chen, Auteur ; Wei-Jen Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 626 - 639 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : Asynchronous  generators--Power  control--Superconducting  magnet  energy  storage--Wind  power Résumé : This paper presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping enhancement of a novel hybrid wind and marine-current farm (MCF) connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) while an equivalent 60-MW IG is employed to simulate the characteristics of the MCF. A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigen techniques and a time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied combined WF and MCF under various wind speeds. The inherent fluctuations of the injected active power and reactive power of the WF and MCF to the power grid can also be effectively controlled by the proposed control scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071238&sortType%3Das [...] [article] Dynamic stability enhancement and power flow control of a hybrid wind and marine-current farm using SMES [texte imprimé] / Wang, Li, Auteur ; Shiang-Shong Chen, Auteur ; Wei-Jen Lee, Auteur . - 2010 . - pp. 626 - 639. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 626 - 639 Mots-clés : Asynchronous  generators--Power  control--Superconducting  magnet  energy  storage--Wind  power Résumé : This paper presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping enhancement of a novel hybrid wind and marine-current farm (MCF) connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) while an equivalent 60-MW IG is employed to simulate the characteristics of the MCF. A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigen techniques and a time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied combined WF and MCF under various wind speeds. The inherent fluctuations of the injected active power and reactive power of the WF and MCF to the power grid can also be effectively controlled by the proposed control scheme. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5071238&sortType%3Das [...]

Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines / Fei Liu in Journal of food engineering, Vol. 83 N°3 (Decembre 2007) 

Public ISBD [article]  in Journal of food engineering > Vol. 83 N°3 (Decembre 2007) . - 430-435 p. Titre : Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines Type de document : texte imprimé Auteurs : Fei Liu, Auteur ; He, Yong, Auteur ; Wang, Li, Auteur Article en page(s) : 430-435 p. Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Vis/NIR  spectroscopy  Rice  wine  Soluble  solids  content  (SSC)  pH  Partial  least  squares  (PLS)Vis  /  NIR  spectroscopie  Vin  de  riz  Solides  solubles  (SSC)  Le  pH  Moindres  carrés  partiels  (PLS) Index. décimale : 664 Résumé : Visible and near infrared (Vis/NIR) transmission spectroscopy and a hybrid chemometric method were applied to determine the soluble solids content (SSC) and pH of rice wines. Rice wine samples were scanned by a spectroradiometer within a wavelength region of 325–1075 nm. The calibration set was composed of 240 samples and 60 samples were used as the validation set. Two pre-processing methods were applied on the spectra prior to build PLS regression models. The correlation coefficient (r), standard error of prediction (SEP) and root mean square error of prediction (RMSEP) were 0.95, 0.16 and 0.17 for SSC, while 0.94, 0.02 and 0.02 for pH, respectively. Adequate wavelengths for the SSC and pH prediction were proposed according to the x-loading weights and regression coefficients. The results indicated that Vis/NIR spectroscopy is a promising approach for predicting the SSC and pH of the rice wine. Visible et le proche infrarouge (Vis / NIR) et la spectroscopie de transmission hybride chemometric méthode a été appliquée pour déterminer les éléments solides solubles (SSC) et le pH des vins de riz. Vin de riz échantillons ont été scannés par un spectroradiomètre sein d'une longueur d'onde de 325-1075 mn. L'étalonnage de la série était composée de 240 échantillons et 60 échantillons ont été utilisés comme l'ensemble de validation. Deux méthodes de traitement préalable ont été appliquées sur les spectres avant de construire les modèles de régression PLS. Le coefficient de corrélation (r) erreur standard de prédiction (SEP) et la racine erreur quadratique moyenne de prédiction (RMSEP) étaient 0,95, 0,16 et 0,17 pour la coopération Sud-Sud, tandis que 0,94, 0,02 et 0. 02 pour le pH, respectivement. Les longueurs d'ondes adéquates pour la coopération Sud-Sud et le pH de prédiction ont été proposés en fonction de la charge x poids et coefficients de régression. Les résultats ont indiqué que Vis / NIR spectroscopie est une approche prometteuse pour prédire le pH de la coopération Sud-Sud et le vin de riz. DEWEY : 664 ISSN : 0260-8774 RAMEAU : Alcool de riz En ligne : http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleLis [...] [article] Feasibility of the use of visible and near infrared spectroscopy to assess soluble solids content and pH of rice wines [texte imprimé] / Fei Liu, Auteur ; He, Yong, Auteur ; Wang, Li, Auteur . - 430-435 p. Génie Chimique Langues : Anglais (eng) in Journal of food engineering > Vol. 83 N°3 (Decembre 2007) . - 430-435 p. Mots-clés : Vis/NIR  spectroscopy  Rice  wine  Soluble  solids  content  (SSC)  pH  Partial  least  squares  (PLS)Vis  /  NIR  spectroscopie  Vin  de  riz  Solides  solubles  (SSC)  Le  pH  Moindres  carrés  partiels  (PLS) Index. décimale : 664 Résumé : Visible and near infrared (Vis/NIR) transmission spectroscopy and a hybrid chemometric method were applied to determine the soluble solids content (SSC) and pH of rice wines. Rice wine samples were scanned by a spectroradiometer within a wavelength region of 325–1075 nm. The calibration set was composed of 240 samples and 60 samples were used as the validation set. Two pre-processing methods were applied on the spectra prior to build PLS regression models. The correlation coefficient (r), standard error of prediction (SEP) and root mean square error of prediction (RMSEP) were 0.95, 0.16 and 0.17 for SSC, while 0.94, 0.02 and 0.02 for pH, respectively. Adequate wavelengths for the SSC and pH prediction were proposed according to the x-loading weights and regression coefficients. The results indicated that Vis/NIR spectroscopy is a promising approach for predicting the SSC and pH of the rice wine. Visible et le proche infrarouge (Vis / NIR) et la spectroscopie de transmission hybride chemometric méthode a été appliquée pour déterminer les éléments solides solubles (SSC) et le pH des vins de riz. Vin de riz échantillons ont été scannés par un spectroradiomètre sein d'une longueur d'onde de 325-1075 mn. L'étalonnage de la série était composée de 240 échantillons et 60 échantillons ont été utilisés comme l'ensemble de validation. Deux méthodes de traitement préalable ont été appliquées sur les spectres avant de construire les modèles de régression PLS. Le coefficient de corrélation (r) erreur standard de prédiction (SEP) et la racine erreur quadratique moyenne de prédiction (RMSEP) étaient 0,95, 0,16 et 0,17 pour la coopération Sud-Sud, tandis que 0,94, 0,02 et 0. 02 pour le pH, respectivement. Les longueurs d'ondes adéquates pour la coopération Sud-Sud et le pH de prédiction ont été proposés en fonction de la charge x poids et coefficients de régression. Les résultats ont indiqué que Vis / NIR spectroscopie est une approche prometteuse pour prédire le pH de la coopération Sud-Sud et le vin de riz. DEWEY : 664 ISSN : 0260-8774 RAMEAU : Alcool de riz En ligne : http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleLis [...]

Gas-liquid-liquid three-phase reactive extraction for the hydrogen peroxide preparation by anthraquinone process / Yongxi Cheng in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7414–7418 Titre : Gas-liquid-liquid three-phase reactive extraction for the hydrogen peroxide preparation by anthraquinone process Type de document : texte imprimé Auteurs : Yongxi Cheng, Auteur ; Wang, Li, Auteur ; Shuxiang Lü, Auteur Année de publication : 2008 Article en page(s) : p. 7414–7418 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas-liquid-liquid  three-phase  reactive  extraction  Hydrogen  peroxide  Anthrahydroquinone--oxidation Résumé : The gas−liquid−liquid three-phase reactive extraction at elevated pressures for the preparation of hydrogen peroxide by anthraquinone route was investigated experimentally. The integrated process of the oxidation reaction of anthrahydroquinone in the working solution by oxygen from the oxygen-containing gas and the extraction of hydrogen peroxide from the working solution with deionized water were carried out in a sieve plate column of 50 mm in diameter at 0.1−0.6 MPa and 323 K. All operating conditions focused in this work such as operating pressure, superficial gaseous velocity, and oxygen concentration in the initial gas were the advantageous parameters for enhancing the conversion of anthrahydroquinone in the integrated process, because the rate-controlling step of the oxidation reaction of anthrahydroquinone is the mass transfer of oxygen at the interface between the gaseous phase and the organic phase. The agitating effect caused by the gaseous phase made the droplets of the organic phase become smaller and, thus, increased the liquid−liquid interfacial contact areas, resulting in the improvement of the mass transfer of hydrogen peroxide at the water−working solution interface. However, a large excess of the gas superficial velocity caused the decrease in the extraction efficiency of hydrogen peroxide. The real gas superficial velocity on the upper section of the extraction column at the high initial concentration of oxygen was lower than that at the low oxygen concentration, resulting in the decrease of the extraction efficiency of hydrogen peroxide. There was no change in the extraction efficiency of hydrogen peroxide with increasing operating pressure, although the mass transfer rate of hydrogen peroxide at the water−working solution interface increased slightly. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800500y [article] Gas-liquid-liquid three-phase reactive extraction for the hydrogen peroxide preparation by anthraquinone process [texte imprimé] / Yongxi Cheng, Auteur ; Wang, Li, Auteur ; Shuxiang Lü, Auteur . - 2008 . - p. 7414–7418. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7414–7418 Mots-clés : Gas-liquid-liquid  three-phase  reactive  extraction  Hydrogen  peroxide  Anthrahydroquinone--oxidation Résumé : The gas−liquid−liquid three-phase reactive extraction at elevated pressures for the preparation of hydrogen peroxide by anthraquinone route was investigated experimentally. The integrated process of the oxidation reaction of anthrahydroquinone in the working solution by oxygen from the oxygen-containing gas and the extraction of hydrogen peroxide from the working solution with deionized water were carried out in a sieve plate column of 50 mm in diameter at 0.1−0.6 MPa and 323 K. All operating conditions focused in this work such as operating pressure, superficial gaseous velocity, and oxygen concentration in the initial gas were the advantageous parameters for enhancing the conversion of anthrahydroquinone in the integrated process, because the rate-controlling step of the oxidation reaction of anthrahydroquinone is the mass transfer of oxygen at the interface between the gaseous phase and the organic phase. The agitating effect caused by the gaseous phase made the droplets of the organic phase become smaller and, thus, increased the liquid−liquid interfacial contact areas, resulting in the improvement of the mass transfer of hydrogen peroxide at the water−working solution interface. However, a large excess of the gas superficial velocity caused the decrease in the extraction efficiency of hydrogen peroxide. The real gas superficial velocity on the upper section of the extraction column at the high initial concentration of oxygen was lower than that at the low oxygen concentration, resulting in the decrease of the extraction efficiency of hydrogen peroxide. There was no change in the extraction efficiency of hydrogen peroxide with increasing operating pressure, although the mass transfer rate of hydrogen peroxide at the water−working solution interface increased slightly. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800500y

Kinetics of epoxidation of hydroxyl-terminated polybutadiene with hydrogen peroxide under phase transfer catalysis / Qingfa Wang in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1364–1371 Titre : Kinetics of epoxidation of hydroxyl-terminated polybutadiene with hydrogen peroxide under phase transfer catalysis Type de document : texte imprimé Auteurs : Qingfa Wang, Auteur ; Xiangwen Zhang, Auteur ; Wang, Li, Auteur Année de publication : 2009 Article en page(s) : p. 1364–1371 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydroxyl-terminated  polybutadiene  --  epoxidation  Hydrogen  peroxide  Phosphoric  acid  Ammonium Résumé : The epoxidation of hydroxyl-terminated polybutadiene (HTPB) via phase transfer catalysis (PTC) using H2O2 as the oxidant and ammonium tungstate hydrate and phosphoric acid as the cocatalysts was successfully carried out in an acidic solution/organic solvent two-phase medium. The microstructures of original and epoxidized HTPB products were confirmed by 1H NMR and 13C NMR. The influence of some process variables such as stirring speed, ammonium tungstate hydrate amount, Aliquat 336 amount, phosphoric acid amount, hydrogen peroxide amount, and reaction temperature on the epoxidation of HTPB were studied in detail. The reactions in organic phase were the rate-controlling steps. Based on the experimental results, a rational PTC mechanism was proposed and a pseudo-steady-state kinetic model was applied to describe the epoxidation of HTPB. The apparent kinetic constants for the three configurations in HTPB under the temperatures of 20−60 °C were determined (kapp,c = (2.7−6.43) × 10−2 min−1, kapp,t = (0.95−4.49) × 10−2 min−1, kapp,v = (0.08−0.65) × 10−2 min−1). The activation energies of cis, trans, and vinyl configurations in the epoxidation of HTPB were 19.72, 31.35, and 90.75 kJ mol−1, respectively. This method (Aliquat 336 as PTC/H2O2/ammonium tungstate hydrate and phosphoric acid as the cocatalysts) was very effective for the epoxidation of HTPB. The chemoselectivity of epoxidation of three configurations in HTPB (cis, trans, and vinyl) was evaluated. The reactivity of double bonds toward epoxidation, depending on the chain microstructure, decreased in the following order: 1,4-cis > 1,4-trans > 1,2-vinyl. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800875h [article] Kinetics of epoxidation of hydroxyl-terminated polybutadiene with hydrogen peroxide under phase transfer catalysis [texte imprimé] / Qingfa Wang, Auteur ; Xiangwen Zhang, Auteur ; Wang, Li, Auteur . - 2009 . - p. 1364–1371. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1364–1371 Mots-clés : Hydroxyl-terminated  polybutadiene  --  epoxidation  Hydrogen  peroxide  Phosphoric  acid  Ammonium Résumé : The epoxidation of hydroxyl-terminated polybutadiene (HTPB) via phase transfer catalysis (PTC) using H2O2 as the oxidant and ammonium tungstate hydrate and phosphoric acid as the cocatalysts was successfully carried out in an acidic solution/organic solvent two-phase medium. The microstructures of original and epoxidized HTPB products were confirmed by 1H NMR and 13C NMR. The influence of some process variables such as stirring speed, ammonium tungstate hydrate amount, Aliquat 336 amount, phosphoric acid amount, hydrogen peroxide amount, and reaction temperature on the epoxidation of HTPB were studied in detail. The reactions in organic phase were the rate-controlling steps. Based on the experimental results, a rational PTC mechanism was proposed and a pseudo-steady-state kinetic model was applied to describe the epoxidation of HTPB. The apparent kinetic constants for the three configurations in HTPB under the temperatures of 20−60 °C were determined (kapp,c = (2.7−6.43) × 10−2 min−1, kapp,t = (0.95−4.49) × 10−2 min−1, kapp,v = (0.08−0.65) × 10−2 min−1). The activation energies of cis, trans, and vinyl configurations in the epoxidation of HTPB were 19.72, 31.35, and 90.75 kJ mol−1, respectively. This method (Aliquat 336 as PTC/H2O2/ammonium tungstate hydrate and phosphoric acid as the cocatalysts) was very effective for the epoxidation of HTPB. The chemoselectivity of epoxidation of three configurations in HTPB (cis, trans, and vinyl) was evaluated. The reactivity of double bonds toward epoxidation, depending on the chain microstructure, decreased in the following order: 1,4-cis > 1,4-trans > 1,2-vinyl. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800875h

Load-tracking performance of an autonomous SOFC-based hybrid power generation/energy storage system / Wang, Li in IEEE transactions on energy conversion, Vol. 25 N° 1 (Mars 2010) 

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Permeate flux curve characteristics analysis of cross - flow vacuum membrane distillation / Hongtao Wang in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

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Small-signal stability analysis of an autonomous hybrid renewable energy power generation/energy storage system / Dong-Jing Lee in IEEE transactions on energy conversion, Vol. 23 N°1 (Mars 2008) 

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Stability analysis of a wave-energy conversion system containing a grid-connected induction generator driven by a wells turbine / Wang, Li in IEEE transactions on energy conversion, Vol. 25 N° 2 (Juin 2010) 

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A study on generator capacity for wind turbines under various tower heights and rated wind speeds using weibull distribution / Tai-Her Yeh in IEEE transactions on energy conversion, Vol. 23 n°2 (Juin 2008) 

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