熱交換器の伝熱制限を考慮した超臨界CO_2ガスタービンサイクル特性の解析

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Cycle characteristics of closed gas turbines using super critical carbon dioxide as a working fluid are investigated. It is found an anomalous behavior of physical properties of CO_2 at pseudo-critical point may limit heat exchange rate of recuperator due to the presence of pinch point inside recuperator. Taking such pinch problem into consideration, the cycle efficiency of Brayton cycle is assessed. Its value is found limited to 39% degraded by 8% compared with the case without the pinch present inside. As an alternative part flow cycle is investigated and its operable range has been identified. It is revealed that the part flow cycle is effective to recover heat transfer capability of the recuperator and may achieve the cycle efficiency as much as 45% under the condition of compressor discharge pressure of 20MPa and temperatures of 800K and 308K at turbine inlet and compressor inlet respectively. Turbine expansion ratio to give highest thermal efficiency shifts with turbine inlet temperature while that to give largest specific output remains at 2.4 regardless of turbine inlet temperatures of 600K through 850K. Optimized turbine expansion ratio and part flow ratio at 800K were 2.51 and 0.68 respectively. In neither compressor nor turbine, deteriorated adiabatic efficiency may affect cycle efficiency so much. However, pressure drop characteristics of heat exchangers govern the cycle efficiency.
社団法人日本ガスタービン学会の論文
2008-03-20

熱交換器の伝熱制限を考慮した超臨界CO_2ガスタービンサイクル特性の解析

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