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Show 5 fuel-rich (1 st stage) and fuel-lean (2nd stag) combustion technologies, Inay be worth for further investigation. 4. CONCLUSION A new concept or high-efficient gas turbine combined cycle system has been proposed. The systeln consists of a cOlnbllstor operated under fuel-rich and high pressure and C/C composite material adopted as turbine blade n1uterials. The thermal efficiency of the proposed con1bined cycle system was estimated using on1e asslllnptions. From the calculation, the gas turbine can realize 440/0 in thelmal efficiency, and the total efficiency of the combined system becolnes 660/0. As one of key technologies to develop the new gas turbine system, a lab-scale combustor in which chemical cOll1bustion under high pressure can be realized, was designed. And the combustion characteristic were examined experimentally and theoretically. It was found that, (l) flammability limit extended with increasing the equivalence ratio in fuel-rich side while it was constant in fuel-lean side, and (2) emissions of NOx decreased drastically with increasing the equivalence ratio in fuel-rich side, and with increase of the operating pressure as well. These encourage us to advance the research and development of the proposed gas turbine system. ACKNOWLEDGMENT This study was partially supported by the Ministry of Education, Since and Culture, NEDO (New Energy and Industrial Technology and Development Organization) and Chubu Electric Power Company Incorporated, Japan. The authors would like to thank to these financial supports. REFERENCES (1) N.Arai, N.Teramae and N.Kobayashi:" Survey of Recent of Research and Development on High-temperature Gas Turbine related to our RAN-Gas Turbine System": N.Arai, N.Teramae and N.Kobayashi, Energy World in press (2) T.Hashimoto, T. Yoshino, N .Arai, and N.Kobayashi, "Combustor of High-Telnperature and High-Pressure of Methane-Air", The 30th Combustion Symposium, Japan, pp.SS-57 (1992) |