Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Analysis of Design and Part Load Performance of Micro Gas Turbine/Organic Rankine Cycle Combined Systems

  • Lee, Joon-Hee (Department of Mechanical Engineering, Inha University) ;
  • Kim, Tong-Seop (Department of Mechanical Engineering, Inha University)
  • Published : 2006.09.01
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Abstract

This study analyzes the design and part load performance of a power generation system combining a micro gas turbine (MGT) and an organic Rankine cycle (ORC). Design performances of cycles adopting several different organic fluids are analyzed and compared with performance of the steam based cycle. All of the organic fluids recover greater MGT exhaust heat than the steam cycle (much lower stack temperature), but their bottoming cycle efficiencies are lower. R123 provides higher combined cycle efficiency than steam does. The efficiencies of the combined cycle with organic fluids are maximized when the turbine exhaust heat of the MGT is fully recovered at the MGT recuperator, whereas the efficiency of the combined cycle with steam shows an almost reverse trend. Since organic fluids have much higher density than steam, they allow more compact systems. The efficiency of the combined cycle, based on a MGT with 30 percent efficiency, can reach almost 40 percent. hlso, the part load operation of the combined system is analyzed. Two representative power control methods are considered and their performances are compared. The variable speed control of the MGT exhibits far better combined cycle part load efficiency than the fuel only control despite slightly lower bottoming cycle performance.

Keywords

References

  1. Aspen Technology, 2004, HYSYS, ver. 3.2
  2. Brasz, J. J. and Biederman, B. P., 2003, 'Low Temperature Waste Heat Power Recovery Using Refrigeration Equipment,' 21st IIR International Congress of Refrigeration, Aug. 17-22, Washington DC, USA, ICR0587
  3. Bronicki, L. Y. and Schochet, D. N., 2005, 'Bottoming Organic Cycle for Gas Turbines,' ASME paper GT2005-68121
  4. Kim, J. H., Kim, T. S., Sohn, J. L. and Ro, S. T., 2003, 'Comparative Analysis of Off-Design Performance Characteristics of Single and Two Shaft Industrial Gas Turbines,' Trans ASME, J. of Eng. for Gas Turbines and Power, Vol. 125, pp. 954-960 https://doi.org/10.1115/1.1615252
  5. Kim, T. S. and Hwang, S. H, 2006, 'Part Load Performance Analysis of Recuperated Gas Turbines Considering Engine Configuration and Operation Strategy,' Energy, Vol. 31, pp. 260-277 https://doi.org/10.1016/j.energy.2005.01.014
  6. McDonald, C. F., 2000, 'Low-cost Compact Primary Surface Recuperator Concept for Micro-turbines,' Applied Thermal Engineering, Vol. 20, pp. 471-497 https://doi.org/10.1016/S1359-4311(99)00033-2
  7. McDonald, C. F. and Rodgers, C., 2005, 'Ceramic Recuperator and Turbine - The Key to Achieving a 40 percent Efficient Microturbine,' ASME paper GT2005-68644
  8. Rodgers, C., Watts, J., Thoren, D., Nichols, K. and Brent, R., 2001, Micro-turbines, In: Borbely, A.M. and Kreider, J, F., editors., Distributed Generation, New York, CRC Press, pp. 119-150
  9. U.S. Department of Energy, 2000, Advanced Micro-turbine Systems, Program Plan for Fiscal Year 2000 Through 2006
  10. Yamamoto, T., Furuhata, T., Arai, N. and Mori, M., 2001, 'Design and Testing of the Organic Rankine Cycle,' Energy, Vol. 26, pp. 239-251 https://doi.org/10.1016/S0360-5442(00)00063-3
  11. Zyhowski, G. J., 2003, 'Opportunities for HFC245F A Organic Rankine Cycle Appended to Distributed Power Generation Systems,' 21st IIR International Congress of Refrigeration, Aug. 17-22, Washington DC, USA, ICR0508