• DOI:10.17185/DUEPUBLICO/48871
• Corpus ID: 204827198

Development and power generating operation of the supercritical carbon dioxide power cycle experimental test loop in KIER

@inproceedings{Cho2019DevelopmentAP,
  title={Development and power generating operation of the supercritical carbon dioxide power cycle experimental test loop in KIER},
  author={Junhyun Cho and Hyungki Shin and Jongjae Cho and Bongsu Choi and Chul Woo Roh and Beomjoon Lee and Gilbong Lee and Ho Sang Ra and Young-Jin Baik},
  year={2019}
}

• Junhyun Cho, Hyungki Shin, +6 authors Y. Baik
• Published 12 June 2019
• Engineering

Korea Institute of Energy Research Institute (KIER) develops three supercritical carbon dioxide power cycle (SCO2) experimental test loops: kWe, tens of kWe and hundreds of kWe class. First, a 4.5 kWe single radial-type turbogenerator with a labyrinth seal and an angular contact ball bearing was developed to operate a simple recuperated transcritical cycle. A 86 We of electric power was obtained during 30 minutes under a 320°C of turbine inlet condition. Second, a 60 kWe single stage axial impulse-type turbogenerator with a conventional carbon floating ring seal and oillubricated tilting-bearings was developed. A 10 kW of electric power was obtained during 4.2 hours by operating on the simple transcritical cycle using a liquid CO2 pump. A 212°C of temperature and 123 bar of pressure were maintained at the turbine inlet. A continuous closed loop was successfully operated by adding a leakage make-up loop. Third, a 120 kWe dual Brayton test loop for a 500°C and a 130 bar of turbine inlet conditions is now being developed. A flue-gas heater, a centrifugal compressor with a dry gas seal and two recuperators were developed, now, these components are being commissioned respectively. INTRODUCTION Researchers have studied the supercritical CO2 (S-CO2) cycle as a promising power cycle technology that has benefits of improved thermal efficiency, reduction in size, LCOE (Levelized cost of electricity), water use, quick response time, and various conventional and renewable heat sources applications. USA is now constructing a 10 MWe indirect SCO2 pilot plant operated by GTI, Southwest Research Institute (SwRI) and GE Global Research with support from U.S. Department of Energy/National Energy Technology Laboratory (U.S. DOE/NETL) [1]. The Southwest Research Institute and GE Global Research have been designing a 10 MWe S-CO2 turbo-expander as a Sunshot program which 700°C turbine inlet temperature and are commissioning it at a 1 MWe testing facility [2]. Naval Nuclear Laboratory previously Bechtel Marine Propulson Co. has developed a 100 kWe test loop for marine application and is testing a dynamic performance of the component and the cycle [3]. Peregrine Turbine Technologies has developed a 1 MWe S-CO2 turbopump and is testing the device on the test loop facility of the Sandia National Laboratory [4]. Echogen has developed and tested an 8 MW SCO2 system and now is developing a 1.3 MWe leak-free S-CO2 system [5]. A direct-fired S-CO2 cycle as known as Allam cycle, NetPower collaborated with Toshiba is now commissioning a 50 MWth demo plant [6]. KEPCO (Korea Electric Power Corporation) with Hanhwa Power system have started project to develop 10 MWe-class direct-fired S-CO2 system [7]. The Korea Institute of Energy Research (KIER) is operating two lab-scale S-CO2 experimental test loops which are 500°C-kWe-class and 200°C-tens of kWe-class and is now constructing the final 500°C-hundreds of kWe-class test loop consists of two axial-type turbines for distributed power source applications. In 2017, preliminary electricity generation tests of both test loops were successful. A 287 We electricity was obtained from kWe-class radial type turbo-generator under 400°C/112bar turbine inlet conditions. A 10 kWe electricity