Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 2
Abstract
The Swiss confederation aims to phase out nuclear power production with its Energy Strategy 2050 program by increasing the renewable energy contribution to its overall energy generation. Hydroelectricity, which is the most important form of renewable energy in Switzerland, supplying almost 60% of the electricity in 2015, should increase its production capacity to achieve this goal. The case study presented in this paper focuses on the replacement of the third turbine in the Gondo high-head power plant with a turbine with a higher discharge capacity. The results of one-dimensional (1D) numerical simulations shown that throttling the surge tank is an efficient measure to adapt the existing hydraulic system for the increased discharge. Physical-scale modeling was performed to validate the design of the grid throttle placed at the bottom of the lower chamber of the existing surge tank. The grid throttle geometry and its head losses are compared with two existing similar throttles in Switzerland. Finally, prototype tests of the temporal evolution of water levels in the surge tank using the throttle coefficients obtained experimentally showed good agreement. Hybrid modeling using a combination of 1D numerical models, three-dimensional (3D) physical models, and prototype tests are highly recommended for checking the transient performance of the waterway after a refurbishment of turbines with increased design discharge. Furthermore, placing a throttle at the bottom of an existing surge tank is often an effective and economical solution in the case of small increases in installed capacity.
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References
Adam, N. J., De Cesare, G., and Schleiss, A. J. (2016a). “Experimental assessment of head losses through elliptical and sharp-edged orifices.” Proc., Sustainable Hydraulics in the Era of Global Change, Liège, Belgium.
Adam, N. J., De Cesare, G., and Schleiss, A. J. (2016b). “Surge tank throttles for safe and flexible operation of storage plants.” Proc., Hydro Conf. 2016, Alison Bartle, Wallington, Surrey, U.K.
Adam, N. J., De Cesare, G., Schleiss, A. J., Richard, S., and Muench-Alligné, C. (2016c). “Head loss coefficient through sharp-edged orifices.” Earth Environ. Sci., 49(6), 062009.
Alligne, S., Rodic, P., Arpe, J., Mlacnik, J., and Nicolet, C. (2014). “Determination of surge tank diaphragm head losses by CFD simulations.” Advances in hydroinformatics, Springer, Singapore, 325–336.
An, J. F., Zhang, J., and Cheng, S. (2013). “Coefficients of local head losses in steady-state flow of throttled surge tanks with standpipe by CFD.” Adv. Mat. Res., 677, 290–295.
Billeter, P., Portner, C., Blötz, A., and Hager, H. (1996). “Coupled numerical and physical simulation of te surge tank dynamics for the refurbishment of a high head power plant.” Proc., Modelling, Testing and Monitoring for Hydro Powerplants—II, Alison Bartle, Wallington, Surrey, U.K.
Blevins, R. D. (1984). Applied fluid dynamics handbook, Vol. 1, Van Nostrand Reinhold, New York, 568.
Cao, H., Zheng, C., Luo, F., and Guo, L. (2013). The effect of surge tanks in the process of the protection towards water hammer fluctuation in long-distance pipelines, ASCE, Reston, VA, 249–261.
Chaudhry, M. H. (2011). “Modeling of one-dimensional, unsteady, free-surface, and pressurized flows.” J. Hydraul. Eng., 148–157.
Chaudhry, M. H. (2014). Applied hydraulic transients, Springer, New York.
De Cesare, G., Adam, N. J., Nicolet, C., Billeter, P., Angermayr, A., and Valluy, B. (2015). “Surge tank geometry modification for power increase.” Proc., Hydro 2015, Alison Bartle, Wallington, Surrey, U.K.
De Martino, G., and Fontana, N. (2012). “Simplified approach for the optimal sizing of throttled air chambers.” J. Hydraul. Eng., 1101–1109.
Di Santo, A. R., Fratino, U., Iacobellis, V., and Piccinni, A. F. (2002). “Effects of free outflow in rising mains with air chamber.” J. Hydraul. Eng., 992–1001.
Gabl, R., et al. (2014). “Numerical simulations in hydraulic engineering.” Computational engineering, G. Hofstetter, ed., Springer, Cham, Switzerland, 195–224.
Gabl, R., Achleitner, S., Neuner, J., Gotsch, H., and Aufleger, M. (2011). “3D-numerical optimisation of an asymmetric orifice in the surge tank of a high-head power plant.” Proc., 34th World Congress of the Int. Association for Hydro-Environment Research and Engineering: 33rd Hydrology and Water Resources Symp. and 10th Conf. on Hydraulics in Water Engineering, International Association for Hydro-Environment Engineering and Research, Madrid, Spain, 2428.
Giesecke, J., and Mosonyi, E. (2009). Wasserkraftanlagen: Planung, bau und betrieb, Springer, Berlin (in German).
Hachem, F., Nicolet, C., Duarte, R., De Cesare, G., and Micoulet, G. (2013). “Hydraulic design of the diaphragm’s orifice at the entrance of the surge shaft of FMHL pumped-storage power plant.” Proc., 35th IAHR World Congress: The Wise Find Pleasure in Water: Meandering through Water Science and Engineering, International Association for Hydro-Environment Engineering and Research, Madrid, Spain.
Idel’cik, I. (1969). Mémento des pertes de charges singulières et de pertes de charges par frottement, Eyrolles, Paris (in French).
International Journal on Hydropower and Dams. (2016). World atlas and industry guide 2016, Aqua-Media International, Wallington, U.K.
Jaeger, C. (1977). Fluid transients in hydro-electric engineering practice, Blackie, Glasgow, Scotland.
Kendir, T. E., and Ozdamar, A. (2013). “Numerical and experimental investigation of optimum surge tank forms in hydroelectric power plants.” Renewable Energy, 60, 323–331.
Kim, S. H. (2008). “Impulse response method for pipeline systems equipped with water hammer protection devices.” J. Hydraul. Eng., 961–969.
Kim, S. H. (2010). “Design of surge tank for water supply systems using the impulse response method with the GA algorithm.” J. Mech. Sci. Technol., 24(2), 629–636.
Klasinc, R., and Bilus, I. (2009). “Experimental and numerical approach to surge tank improvements.” Proc., Int. Symp. on Water Management and Hydraulic Engineering, Faculty of Civil Engineering, Univ. of Ss Cyril and Methodius, Skopje, Macedonia, 339–348.
Meusburger, P. (2015). “Study of different surge tank design for Obervermuntwerk II.” Wasserwirtschaft, 105(1), 53–57.
Nabi, G., Kashif, M., and Tariq, M. (2011). “Hydraulic transient analysis of surge tanks: Case study of Satpara and Golen Gol hydropower projects in Pakistan.” Pak. J. Eng. Appl. Sci, 8, 34–48.
Nicolet, C., et al. (2007). “High-order modeling of hydraulic power plant in islanded power network.” IEEE Trans. Power Syst., 22(4), 1870–1880.
Nicolet, C. (2007). “Hydroacoustic modelling and numerical simulation of unsteady operation of hydroelectric systems.”, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Nicolet, C., Vullioud, G., Weiss, E., Bocherens, E., Dayer, J.-D., and Chène, O. (2012). “Transient analysis of Cleuson-Dixence power plant and injector closure in the reflection time.” Proc., 11th Int. Conf. on Pressure Surges, BHR Group, Lisbon, Portugal, 27–41.
Prenner, R. K. (1999). Design of throttled surge tanks for high-head plants: Comparison of the hydraulic behavior of several throttle types in a straight pipe during pressure wave transmission, ASCE, Reston, VA, 1–10.
Richter, W., Dobler, W., and Knoblauch, H. (2012). “Hydraulic and numerical modelling of an asymmetric orifice within a surge tank.” Proc., 4th IAHR Int. Symp. on Hydraulic Structures, International Association for Hydro-Environment Engineering and Research, Madrid, Spain.
Schneider, J., Richter, W., Knoblauch, H., and Zenz, G. (2014). “Physikalische und numerische untersuchungen von wasserschlössern im rahmen der neuerrichtung von pumpspeicherkraftwerken.” Proc., 37. Dresdner Wasserbaukolloquium 2014—Simulationsverfahren und Modelle für Wasserbau und Wasserwirtschaft, Institut für Wasserbau und Techische Hydromechanik, Dresden, Germany (in German).
SFOE (Swiss Federal Office of Energy). (2016). “Schweiz elektrizitätsstatistik 2015: Statistique suisse de l’électricité 2015.” Bern, Switzerland.
SIMSEN [Computer software]. Simsen, Lausanne, Switzerland.
Vereide, K., Richter, W., Zenz, G., and Lia, L. (2015). “Surge tank research in Austria and Norway.” WasserWirtschaft Extra, 1, 58–62.
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©2017 American Society of Civil Engineers.
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Received: Feb 17, 2017
Accepted: Jul 18, 2017
Published online: Nov 29, 2017
Published in print: Feb 1, 2018
Discussion open until: Apr 29, 2018
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