The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Analysis of Performance Enhancement of a Combined Cycle Power Plant by the Change of Design Parameters of Gas Turbine Using Coolant Pre-cooling

냉각공기 예냉각을 통한 가스터빈 설계변수 변화에 의한 복합발전시스템 성능향상 분석

  • Received : 2016.07.04
  • Accepted : 2016.08.24
  • Published : 2016.10.01
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Abstract

Turbine blade cooling is one of the major technologies to enhance the performance of gas turbine and combined cycle power plants. In this study, two cases of coolant pre-cooling schemes were applied in combined cycle power plant: decrease of coolant mass flow needed to cool turbine blade and increase of turbine inlet temperature (TIT). Both schemes are benefited by the decrease of coolant temperature through coolant pre-cooling. Under the same degree of pre-cooling, increasing TIT exhibits larger plant power boost and higher plant efficiency than reducing coolant flow. As a result, the former produces the same gas turbine power with a much smaller degree of pre-cooling than the latter. Another advantage of increasing TIT is a higher plant efficiency. Even with an assumption of partial achievement of the theoretically predicted TIT, the method of increasing TIT can provide considerably larger power output.

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References

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