THERMAL SCIENCE

International Scientific Journal

Mirjana S. Laković

,

Mladen M. Stojiljković

,

Slobodan Laković

,

Velimir P. Stefanović

,

Dejan Mitrović

IMPACT OF THE COLD END OPERATING CONDITIONS ON ENERGY EFFICIENCY OF THE STEAM POWER PLANTS

ABSTRACT
The conventional steam power plant working under the Rankine Cycle and the steam condenser as a heat sink and the steam boiler as a heat source have the same importance for the power plant operating process. Energy efficiency of the coal fired power plant strongly depends on its turbine-condenser system operation mode. For the given thermal power plant configuration, cooling water temperature or/and flow rate change generate alterations in the condenser pressure. Those changes have great influence on the energy efficiency of the plant. This paper focuses on the influence of the cooling water temperature and flow rate on the condenser performance, and thus on the specific heat rate of the coal fired plant and its energy efficiency. Reference plant is working under turbine-follow mode with an open cycle cooling system. Analysis is done using thermodynamic theory, in order to define heat load dependence on the cooling water temperature and flow rate. Having these correlations, for given cooling water temperature it is possible to determine optimal flow rate of the cooling water in order to achieve an optimal condensing pressure, and thus, optimal energy efficiency of the plant. Obtained results could be used as useful guidelines in improving existing power plants performances and also in design of the new power plants.
KEYWORDS
cold end, cooling water, condensing pressure, energy efficiency
PAPER SUBMITTED: 2010-04-15
PAPER REVISED: 2010-07-20
PAPER ACCEPTED: 2010-08-30
DOI REFERENCE: https://doi.org/10.2298/TSCI100415066L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2010, VOLUME 14, ISSUE Supplement 1, PAGES [S53 - S66]
REFERENCES
  1. Mihajlov J., Thermal power plants, design and building, (in Serbian), Tehnicka knjiga, Zagreb, 1965
  2. Harpster, J.W., Putman, R.E., The Economic Effects of Condenser Backpressure on Heat Rate, Condensate Sub-Cooling and Feedwater Dissolved Oxygen, Proceedings of 2000 International Joint Power Generation Conference, Miami Beach, Florida, July 23-26, 2000
  3. Schumerth, D., Thin-Wall Titanium Condenser Tubing: Explore the Opportunities, Proceedings of 2000 International Joint Power Generation Conference, Miami Beach, Florida, July 23-26, 2000, IJPGC2000-15035
  4. Edgell, D., Davidian, A., Modular Condenser Replacement at ANO-A Solves Operating Problems and Improves Performance, Proceedings of the International Joint Power Generation Conference, Vol. 34, Book No. G01110-1999, 479-482
  5. Trela, M., et al., Monitoring of air Content in a Mixture Removed from Condensers in Application to Steam Turbine Diagnostics, Proceedings of 2000 International Joint Power Generation Conference, Miami Beach, Florida, July 23-26, 2000, IJPGC2000-15002
  6. Kubik, W.J., Spencer, E., Improved Steam Condenser Gas Removal System - in The American Society of Mechanical Engineers, www.grahammfg.com/downloads/36.pdf
  7. Mitrović, D, Živković, D., Laković, M., Energy and Exergy Analysis of a 348.5 MW Steam Power Plant, Energy Sources, vol. 32, (2010), 11, pp. 1016-1027
  8. Bejan, A., Tsatsaronis, G., Moran, M., Thermal Design and Optimization, John Wiley & Sons, Inc., New York, USA, 1996
  9. Incropera, F., De Witt, D., Fundamentals of Heat and Mass Transfer, John Wiley & Sons, Inc., New
  10. York, USA, 1985
  11. Berman, L.D., Tumanov A., Heat Transfer with Condensation of Moving Vapour on a Horizontal Tube, Teploenergetika, 1962, No.10., pp. 77-83.
  12. Fonesca Jr, J., Schneider, P., Comparative Analysis of the IAPWS-IF97 Formulation Performance for Thermodynamic Properties of Water on a Rankine Cycle, Engenharia Termica (Thermal Engineering), No. 5, June 2004, pp. 52-55
  13. Kromhout J., Goudappel E., Pechtl P., Economic Optimization of a 540 MWel Coal Fired Power Plant Using Thermodynamic Simulation, VGB Powertech, 2001, vol. 81, No. 11, pp. 43-46
  14. Swierczewskiego, K., Operating Regulations, Condenser 18K348 Turbo generator Unit, (in Serbian) 8503686D, Zamech, 1983
  15. Truhnii A.D, Losev S.M, Stationary Steam Turbines, Energoizdat, Moscow, 1981
  16. Zhao Bin, Liu Ling, Zhang W., Optimization Of Cold End System Of Steam Turbine, Frontiers of Energy and Power Engineering in China 2008, 2 (3), pp. 348-353
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Impact of the cold end operating conditions on energy efficiency of the steam power plants

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