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축류형 초임계 이산화탄소 터보발전기 구동을 위한 테스트루프 개발 및 운전 연구
조준현(Junhyun CHO),신형기(Hyungi SHIN),조종재(Jongjae CHO),노철우(Chulwoo ROH),이길봉(Gilbong LEE),이범준(Beomjoon LEE),최봉수(Bongsu CHOI),나호상(Ho-Sang RA),백영진(Young-Jin Baik) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
To overcome reported failure problems of the turbomachinery for the supercritical carbon dioxide power cycle induced by the high rotational speed and the axial force, an axial impulse type turbo-generator with a partial admission nozzle was designed and manufactured to reduce the rotational speed as well as the axial force. Then, a turbine wheel part was separated by the carbon ring type mechanical seals to use the conventional oil-lubricated tilting-pad bearings. To drive the turbo-generator, a simple transcritical cycle using a liquid CO2 pump was constructed. A 600,000 kcal/h LNG fired thermal oil boiler and a 200 RT chiller were used as a heat source and heat sink. A target turbine inlet temperature and pressure were 200 °C and 130 bar, respectively. Two printed circuit heat exchangers were manufactured for both sides of the heater and cooler. A leakage make-up system by using a reciprocating CO2 compressor, a CO2 supply valve-train to the main loop and the mechanical seal, an oil cooler for the bearings, a load bank and control systems were installed. Before turbine power generating operation, a turbine bypass loop was operated by using an air-driven control valve to determine the system mass flow rate and to make turbine inlet conditions. Then, a 11 kW electric power was obtained under 205 °C and 100 bar of turbine inlet conditions and a continuous operating time was 45 minutes.
500℃ 터빈 입구 조건의 수백 kWe급 초임계 이산화탄소 발전시스템 테스트루프 개발 연구
조준현(Junhyun CHO),신형기(Hyungi SHIN),조종재(Jongjae CHO),최봉수(Bongsu CHOI),노철우(Chulwoo ROH),이길봉(Gilbong LEE),이범준(Beomjoon LEE),나호상(Ho-Sang RA),백영진(Young-Jin Baik) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
KIER has developed a hundreds of kWe-class supercritical carbon dioxide power cycle (SCO₂) test loop for distributed heat sources such as biomass and waste heat recovery. A 120 kWe dual Brayton cycle which consists of two turbines, a compressor, two recuperators, a flue-gas heater and a cooler was developed and optimized. The turbine and compressor inlet conditions are 500℃/130bar and 35℃ /77bar, respectively. The low temperature turbo-generator was already manufactured and tested in 2017 successfully, it was developed as an axial impulse type turbine with a carbon-ring type mechanical seal and oil-lubricated tilting-pad bearings. A centrifugal type of compressor with a dry gas seal (DGS) and oil-lubricated tilting-pad bearings was developed. To reduce leakage flow, the DGS and its flow control system were manufactured. A LNG-fired flue gas heater which consists of a burner and shell-and-tube type heat exchanger was manufactured. A temperature of 650℃ flue gas was generated to heat carbon dioxide up to 500℃ at 130bar condition. Two PCHE type recuperators and one PCHE type cooler were manufactured. A piping stress analysis was conducted and a high temperature expansion joint was used at the flue-gas heater to mitigate thermal expansion. A full test loop would be constructed and operated in next year.
500℃ 터빈 입구 조건의 수백 kWe급 초임계 이산화탄소 발전시스템 테스트루프 개발 연구
조준현(Junhyun Cho),신형기(Hyungi Shin),조종재(Jongjae Cho),최봉수(Bongsu Choi),노철우(Chulwoo Roh),이길봉(Gilbong Lee),이범준(Beomjoon Lee),나호상(Ho-Sang Ra),백영진(Young-Jin Baik) 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.9
한국에너지기술연구원에서는 바이오매스 및 폐열과 같은 분산 전원에 적합한 수백 kWe급 초임계 이산화탄소 발전사이클 테스트루프를 개발 중에 있다. 터빈 2기, 압축기, 복열기 2기, 연소배가스 이용 히터로 구성된 120kWe 용량의 이중 브레이튼 사이클을 개발하였으며, 목표 터빈 입구 조건은 500℃/135bar이다. 미캐니컬 씰과 틸팅패드 베어링으로 구성된 충동형 축류 터보-발전기는 2017년에 이미 제작, 시험을 성공적으로 완료하였다. 다음 단계로 드라이가스씰(DGS)이 적용된 원심형 압축기를 개발하였으며, 버너와 쉘앤튜브 열교환기로 구성된 650℃의 연소배가스 이용 히터를 제작하고, ASME 기준에 따라 배관 설계를 진행하였다. 전체 테스트루프는 올해 완성 및 운전을 목표로 하고 있다. KIER has being developing hundreds of kWe-class supercritical carbon dioxide power cycle test loops for distributed heat sources such as biomass and waste heat recovery. A 120 kWe dual Brayton cycle which consists of two turbines, a compressor, two recuperators, a flue-gas heater, and a cooler was developed. The target operating turbine inlet condition is 500 ℃/135 bar. An axial impulse-type turbogenerator with a mechanical seal and tilting-pad bearings was successfully manufactured and tested in 2017. As the next phase, a centrifugal-type compressor with a dry gas seal was developed. A 650 ℃ LNG-fired flue gas heater, which consists of a burner and shell-and-tube type heat exchanger, was manufactured. Piping design is carried out according to ASME standards. Full test loop will be constructed and operated in 2019.