THERMODYNAMIC ANALYSIS OF HEAT RECOVERY STEAM GENERATOR IN COMBINED CYCLE POWER PLANT

Abstract

Combined cycle power plants play an important role in the present energy sector. The main challenge in designing a combined cycle power plant is proper utilization of gas turbine exhaust heat in the steam cycle in order to achieve optimum steam turbine output. Most of the combined cycle developers focused on the gas turbine output and neglected the role of the heat recovery steam generator which strongly affects the overall performance of the combined cycle power plant. The present paper is aimed at optimal utilization of the flue gas recovery heat with different heat recovery steam generator configurations of single pressure and dual pressure. The combined cycle efficiency with different heat recovery steam generator configurations have been analysed parametrically by using first law and second law of thermodynamics. It is observed that in the dual cycle high pressure steam turbine pressure must be high and low pressure steam turbine pressure must be low for better heat recovery from heat recovery steam generator.

Keywords

Dates

  • Submission Date2006-09-10
  • Revision Date2007-10-19
  • Acceptance Date2007-11-12

DOI Reference

10.2298/TSCI0704143R

References

  1. Dellenback, P. A., Improved Gas Turbine Efficiency through Alternative Regenerator Configuration, Transaction ASME, Journal of Engineering for Gas Turbines and Power, 124 (2002), 3, pp. 441-446
  2. Ravi Kumar, N., Rama Krishna, K., Sita Rama Raju, A. V., Exergy Analysis of Gas Turbine Power Plant with Alternative Configuration of Regenerator, Proceedings on CD, 2nd International Exergy Energy Environment Symposium (IEEES2), Kos, Greece, 2005, VI-13
  3. Ravi Kumar, N., Sita Rama Raju, A. V., The Study of the Effects of Gas Turbine Inlet Cooling on Plant and HRSG Performance, Proceedings, National Conference on Advances in Mechanical Engineering (AIM-2005), Hyderabad, India, 2005, pp. 55-60
  4. Ong'iro, A., Ugursal, V. I., A1 Taweel, A. M., Walker, J. D., Modeling of Heat Recovery Steam Generator Performance, Applied Thermal Engineering, 17 (1997), 5, pp. 427-446
  5. Nag, P. K, De, S., Design and Operation of a Heat Recovery Steam Generator with Minimum Irreversibility, Applied Thermal Engineering, 17 (1997), 4, pp. 385-391
  6. Ravi Kumar, N., Rama Krishna, K, Sita Rama Raju, A. V, Performance Simulation of Heat Recovery Steam Generator in Combined Cycle Power Plant, Proceedings (Eds. S. C. Mishra, B. V. S. S. S., Prasad, S. V., Garimella), 18th National & 7th ISHMT-ASME Heat and Mass Transfer Conference (HMT-2006), IIT Guwahati, India, 2006, pp.1781-1787
  7. Casarosa, C., Franco, A., Thermodynamic Optimization of the Operative Parameters for the Heat Recovery in Combined Power Plants, Int. J. Applied Thermodynamics, 4 (2001), 1, pp. 43-52
  8. Horlock, J. H., Combined Power Plants, Pergamon Press, Oxford, UK, 1992
  9. Yadav, J. P., Singh, O., Thermodynamic Analysis of Air Cooled Simple Gas and Steam Combined Cycle Plant, Journal of Institution of Engineers (India) - Mechanical Engineering, 2006, Vol. 86, pp. 217-222
Volume 11, Issue 4, Pages143 -156