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Show , PROPOSAL OF CHEMICAL GAS TURBINE AND CHARACTERISTICS OF PRESSURIZED LOW-NOx CHEMICAL COMBUSTION Norio ARAI, Noriyuki KOBA Y ASHI, Koji NAKANO and Aritaka MATSUNAMI Research Center for Advanced Energy Conversion, Nagoya University Furo-cho, Chikusa-ku, Nagoya, 464-01 Japan Phone +81-52-789-3913, Fax +81-52-789-3910 ABSTRACT A new concept of highly efficient gas turbine/steam turbine cOlnbined cycle system with Chenzical Cas Turbine was proposed in order to break through the turbine inlet temperature and the thennal efficiency in the present state. The chemical gas turbine consists of a combustor operated under fuel-rich and high pressure and C/C composite material adopted as turbine blade. The thennal efficiency of the combined system was estimated. From the calculation under the condition of the tenlperature at ISOO°C, it is clear that the gas turbine efficiency is 440/0 and the thennal efficiency of the combined cycle system could be 660/0. The efficiency of the system is much higher than that of conventional one. As one of the most crucial technologies for the development of this proposed chemical gas turbine, a lab-scale combustor in which fuel-rich combustion can be realized under pressurized condition, was designed and the combustion characteristics were exanlined theoretically and experimentaJly. It was found that the flammability limit extended with increasing the equivalence ratio in fuel-rich side while it was constant in fuel-lean side, and that the 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. 1. INTRODUCTION Recently, gas turbine technologies for power-generation in lhernlal power plants and industries have been steadily advancing, inviting rapidly growing deo1and for electricity. As is |
