DOI QR코드

DOI QR Code

Research on Development of Turbo-generator with Partial Admission Nozzle for Supercritical CO2 Power Generation

부분 유입 노즐을 적용한 초임계 이산화탄소 발전용 초고속 터보발전기 개발 연구

  • Cho, Junhyun (Thermal Energy System Laboratory, Korea Institute of Energy Research (KIER)) ;
  • Shin, Hyung-ki (Thermal Energy System Laboratory, Korea Institute of Energy Research (KIER)) ;
  • Kang, Young-Seok (Engine Component Research Team, Korea Aerospace Research Institute (KARI)) ;
  • Kim, Byunghui (InGineers Ltd.) ;
  • Lee, Gilbong (Thermal Energy System Laboratory, Korea Institute of Energy Research (KIER)) ;
  • Baik, Young-Jin (Thermal Energy System Laboratory, Korea Institute of Energy Research (KIER))
  • 조준현 (한국에너지기술연구원 열에너지시스템연구실) ;
  • 신형기 (한국에너지기술연구원 열에너지시스템연구실) ;
  • 강영석 (한국항공우주연구원 엔진부품연구팀) ;
  • 김병휘 ((주)인지니어스) ;
  • 이길봉 (한국에너지기술연구원 열에너지시스템연구실) ;
  • 백영진 (한국에너지기술연구원 열에너지시스템연구실)
  • Received : 2016.09.10
  • Accepted : 2017.01.08
  • Published : 2017.04.01

Abstract

A Sub-kWe small-scale experimental test loop was manufactured to investigate characteristics of the supercritical carbon dioxide power cycle. A high-speed turbo-generator was also designed and manufactured. The designed rotational speed of this turbo-generator was 200,000 rpm. Because of the low expansion ratio through the turbine and low mass flowrate, the rotational speed of the turbo-generator was high. Therefore, it was difficult to select the rotating parts and design the turbine wheel, axial force balance and rotor dynamics in the lab-scale experimental test loop. Using only one channel of the nozzle, the partial admission method was adapted to reduce the rotational speed of the rotor. This was the world's first approach to the supercritical carbon dioxide turbo-generator. A cold-run test using nitrogen gas under an atmospheric condition was conducted to observe the effect of the partial admission nozzle on the rotor dynamics. The vibration level of the rotor was obtained using a gap sensor, and the results showed that the effect of the partial admission nozzle on the rotor dynamics was allowable.

초임계 이산화탄소 발전사이클의 다양한 특성을 분석하기 위하여 Sub-kWe급의 소형 실험장치를 설계, 제작하였으며, 터보발전기를 개발하였다. 초임계 이산화탄소 발전용 터빈에서는 팽창비가 작고, 유량이 작기 때문에 터보발전기의 회전수가 높아지게 되고, 이에 따라 회전 부품의 선정, 터빈 공력설계, 축력 및 회전체 동역학 설계가 어려워지게 된다. 이에 터보발전기의 회전수를 줄이기 위하여 노즐의 여러 채널 중 1개의 노즐만 사용하는 부분유입 방법을 세계 최초로 초임계 이산화탄소 발전용 터보발전기에 적용하였으며, 회전체의 진동을 측정하여 부분유입 노즐을 적용함에도 회전체 안정성은 허용 범위내에 있음을 확인하였다.

Keywords

References

  1. Wright, S. A., Radel, R. F., Vernon, M. E., Rochau, G. E. and Pickard P. S., 2010, Operation and Analysis of a Supercritical $CO_2$ Brayton Cycle, Sandia National Laboratories, Available at: (accessed in Jan. 2016) http://prod.sandia.gov/techlib/access-control.cgi/2010/100171.pdf
  2. Convoy, T., Pasch, J. and Fleming, D., 2013, "Control of a Supercritical $CO_2$ Recompression Brayton Cycle Demonstration Loop," ASME Journal of Engineering for Gas Turbines and Power, Vol. 135, 111701. https://doi.org/10.1115/1.4025127
  3. Clementoni, E., Cox, T. and King, M., 2016, "Steadystate Power Operation of a Supercritical Carbon Dioxide Brayton Cycle with Thermal-hydraulic Control," ASME TurboEXPO 2016, GT2016-56038.
  4. Musgrove, G., Rimpel, A. M. and Wilkes, J. C., 2015, "Fundamentals of Supercritical $CO_2$," ASME TurboEXPO 2015.
  5. http://www.echogen.com
  6. Cho, J., Choi, M., Baik, Y-J., Lee, G., Ra, H-S., Kim B. and Kim, M., 2016, "Development of the Turbomachinery for the Supercritical Carbon Dioxide Power Cycle," International Journal of Energy Research, Vol. 40, No. 5, pp 587-599. https://doi.org/10.1002/er.3453
  7. Cho, J., Shin, H., Ra, H-S., Lee, G., Roh, C., Lee, B. and Baik, Y.-J., 2016, "Development of the Supercritical Carbon Dioxide Power Cycle Experimental Loop in KIER," ASME TurboEXPO 2016, GT2016-57460.
  8. Balje, O. E., 1981, "Turbomachines: A Guide to Design, Selection and Theory," John Wiley & Sons Inc.