Documents disponibles écrits par cet auteur

Hydraulic and sediment removal performance of a modified hydrocyclone / H.P. Pandit in Minerals engineering, Vol. 22 N° 4 (Mars 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 412–414 Titre : Hydraulic and sediment removal performance of a modified hydrocyclone Type de document : texte imprimé Auteurs : H.P. Pandit, Auteur ; N.M. Shakya, Auteur ; H. Stole, Auteur Année de publication : 2009 Article en page(s) : pp. 412–414 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Sediment  Particles  separation  Removal  efficiency  Hydrocyclones Résumé : Traditionally, settling basins have been used to exclude suspended sediment in hydropower plants. However, due to the inability of such basins to exclude fine sediment (predominantly hard minerals such as quartz and feldspar) and the excessive sediment loads in Himalayan Rivers, hydro-mechanical equipment and accessories in these plants have been severely damaged. Not only does this involve huge maintenance costs, but there is also a substantial revenue loss due to reduced equipment efficiencies. Thus, more efficient devices such as hydrocyclones are required to remove sediment particles. However, the geometry of a hydrocyclone plays an important role in hydraulic and sediment removal efficiency, and this paper analyses the experimental results of a test rig consisting of a hydrocyclone, 0.38 m in diameter, with a modified geometry. The results were compared with those of other investigators, and show that the modified hydrocyclone gives better hydraulic and sediment removal. The implications for suspended sediment exclusion in hydropower plants of Himalayan region are pointed out. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002367 [article] Hydraulic and sediment removal performance of a modified hydrocyclone [texte imprimé] / H.P. Pandit, Auteur ; N.M. Shakya, Auteur ; H. Stole, Auteur . - 2009 . - pp. 412–414. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 4 (Mars 2009) . - pp. 412–414 Mots-clés : Sediment  Particles  separation  Removal  efficiency  Hydrocyclones Résumé : Traditionally, settling basins have been used to exclude suspended sediment in hydropower plants. However, due to the inability of such basins to exclude fine sediment (predominantly hard minerals such as quartz and feldspar) and the excessive sediment loads in Himalayan Rivers, hydro-mechanical equipment and accessories in these plants have been severely damaged. Not only does this involve huge maintenance costs, but there is also a substantial revenue loss due to reduced equipment efficiencies. Thus, more efficient devices such as hydrocyclones are required to remove sediment particles. However, the geometry of a hydrocyclone plays an important role in hydraulic and sediment removal efficiency, and this paper analyses the experimental results of a test rig consisting of a hydrocyclone, 0.38 m in diameter, with a modified geometry. The results were compared with those of other investigators, and show that the modified hydrocyclone gives better hydraulic and sediment removal. The implications for suspended sediment exclusion in hydropower plants of Himalayan region are pointed out. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002367

Real-time sediment monitoring in hydropower plants / M. B. Bishwakarma in Journal of hydraulic research, Vol. 46 N°2 (2008) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 282-288 Titre : Real-time sediment monitoring in hydropower plants Titre original : Contrôle des sédiments en temps réel dans les usines hydro-électriques Type de document : texte imprimé Auteurs : M. B. Bishwakarma, Auteur ; H. Stole, Auteur Article en page(s) : p. 282-288 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Hydropower  Instrumentation  Online  monitoring  Optimization  Power  plan  Sediment  measurement  Suspended  sediment Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Sediments have posed great challenges in the operation of Run-of-River (RoR) hydropower plants mainly built on sediment-laden rivers. The relationship between characteristics of sediments and the features of a power plant is not well known. The knowledge and experience gained so far is not enough to deal with the challenges that exist in the operation of hydropower plants with respect to sediment handling. Therefore, the need for real-time sediment monitoring in RoR hydropower plants can hardly be exaggerated. In connection with the Optimum Sediment Handling research programme, the authors were involved in sediment measurement in two of the power plants in Nepal and one in India. The real-time sediment monitoring system that was developed at NTNU and the manual water sampling techniques were employed to monitor the sediment concentration just upstream of the turbine. The sediment monitoring system was calibrated up to the level of observed concentration during the measurement period. In this paper, the authors present the procedures, instrument setup and obtained results from the real-time sediment monitoring system that was employed in these power plants. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] Real-time sediment monitoring in hydropower plants = Contrôle des sédiments en temps réel dans les usines hydro-électriques [texte imprimé] / M. B. Bishwakarma, Auteur ; H. Stole, Auteur . - p. 282-288. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 46 N°2 (2008) . - p. 282-288 Mots-clés : Hydropower  Instrumentation  Online  monitoring  Optimization  Power  plan  Sediment  measurement  Suspended  sediment Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Sediments have posed great challenges in the operation of Run-of-River (RoR) hydropower plants mainly built on sediment-laden rivers. The relationship between characteristics of sediments and the features of a power plant is not well known. The knowledge and experience gained so far is not enough to deal with the challenges that exist in the operation of hydropower plants with respect to sediment handling. Therefore, the need for real-time sediment monitoring in RoR hydropower plants can hardly be exaggerated. In connection with the Optimum Sediment Handling research programme, the authors were involved in sediment measurement in two of the power plants in Nepal and one in India. The real-time sediment monitoring system that was developed at NTNU and the manual water sampling techniques were employed to monitor the sediment concentration just upstream of the turbine. The sediment monitoring system was calibrated up to the level of observed concentration during the measurement period. In this paper, the authors present the procedures, instrument setup and obtained results from the real-time sediment monitoring system that was employed in these power plants. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com