Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Design Criteria Derivation of Supercritical Carbon Dioxide Power Cycle based on Levelized Cost of Electricity(LCOE)

전력단가추정기반 초임계 이산화탄소 발전 시스템 최적 설계 인자 도출

  • Park, Sungho (Plant engineering department, Institute for Advanced Engineering) ;
  • Cha, Jaemin (Plant engineering department, Institute for Advanced Engineering) ;
  • Kim, Joonyoung (Plant engineering department, Institute for Advanced Engineering) ;
  • Shin, Junguk (Plant engineering department, Institute for Advanced Engineering) ;
  • Yeom, Choongsub (Plant engineering department, Institute for Advanced Engineering)
  • 박성호 (고등기술연구원 플랜트 엔지니어링본부) ;
  • 차재민 (고등기술연구원 플랜트 엔지니어링본부) ;
  • 김준영 (고등기술연구원 플랜트 엔지니어링본부) ;
  • 신중욱 (고등기술연구원 플랜트 엔지니어링본부) ;
  • 염충섭 (고등기술연구원 플랜트 엔지니어링본부)
  • Received : 2017.09.12
  • Accepted : 2017.10.22
  • Published : 2017.12.31
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Abstract

The economic analysis for the power plant developed in the conceptual design phase is becoming more important and, research on process optimization for process development that meets the target economic is actively carried out. In the filed of power generation systems, economic assessment methods to predict the levelized cost of electricity (LCOE) has been widely applied for comparing economic effect quantitatively. In this paper, the platform that design criteria of key component required to optimize economic of power cycle can be calculated reversely was established roughly and design criteria of the key equipment (Compressor, turbine, heat exchanger) required to meet the target LCOE (the LCOE of supercritical steam Rankine cycle) was derived when the supercritical $CO_2$ power cycle is applied to the coal-fired power plant.

개념설계 단계에서 개발 공정에 대한 경제적 타당성 분석에 대한 중요성이 대두되고 있으며, 목표 경제성에 부합하는 공정개발을 위한 공정 최적화에 대한 연구도 활발히 진행되고 있다. 발전 시스템 분야에서는 전력 단가(Levelized cost of electricity, LCOE)를 예측하여 경제적 효과를 정량적으로 비교 분석하는 평가 방법이 많이 활용되고 있다. 본 연구에서는 목표 전력 단가에 부합한 발전 시스템을 설계하기 위해서 요구되는 핵심기기의 설계 조건을 역산출 할 수 있는 플랫폼을 구축하였으며 초임계 이산화탄소 발전 시스템이 석탄 화력에 적용될 경우, 목표 전력 단가(초임계 증기 랭킨 사이클 발전 단가, $ 85.4 /kWh)를 충족하기 위해 요구되는 주요 핵심기기(압축기, 터빈, 열교환기) 등의 설계 지표 기준을 도출하였다. 터빈의 등엔트로피 효율이 86%인 경우, 주압축기 효율은 88% 이상 설계되어야 한다. 만약 터빈의 등엔트로피 효율이 88%로 설계된 경우, 주압축기 효율은 82%까지 완화하여 설계가 가능하다. End seal 부분에서 누설량을 0.24% 수준으로 유지하고, 열교환기의 경우 cold side 출구측 온도가 $92{\sim}97^{\circ}C$, 열용량은 2650 ~ 2680 MWth로 설계한다면 목표 전력단가를 충족시킬 수 있을 것으로 확인되었다.

Keywords

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