TED-AJ03-305 LOW NO_x PRE-MIXED COMBUSTION AIMING AT MICRO GAS TURBINE COMBUSTOR
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概要
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Recently, distributed energy system has been attracted much interests because of its high gross energy efficiency and the contribution to adjust local difference of power use. In the components of distributed energy system, micro gas turbine is thought as the central element. The micro gas turbine has been prevailing for the practical use but the detailed structure has not been reported so far. So it is needed to investigate the components of micro gas turbine. The development of the burner is one of the important elements of a micro gas turbine. The requested conditions for the gas turbine combustor are low NOx emission, flame stability and complete combustion. As for low NOx emission, lean premixed combustion is one of the useful methods. The feature of lean premixed combustion is to suppress burnt gas temperature to minimize the reactions by Zeldovich mechanism. In this study, combustors whose concepts consist of the flame stabilization by swirl flow and low NOx emission by the lean premixed combustion are designed and the flame characteristics are investigated by experiment. Also the dominant formation mechanism of NOx for the lean premixed flame and the dependency of NOx generation on pressure, inlet temperature and air ratio is investigated by numerical computation. At first, the combustor whose concept is shown in Fig. 1 is designed and tested. The points of the combustor are (1) flame stabilization by swirl flow and (2) lean premixed combustion by mixing fuel and air at the inlet of combustor to ensure low NOx emission and prevention of flashback. In this combustor, flames are streaky and formed near the exit of fuel injection holes. NOx emission of this combustor could be reduced only to 20ppm. It seems that complete premixing is not achieved in this combustor. So, the premixed combustors are designed to obtain lower limit of NOx emission by lean premixed combustion. From the experiment of the premixed combustor, it is obtained that NOx emission can be suppressed typically 3ppm and CO emission is simultaneously kept small. On the other hand, the computation of the premixed flame is executed to investigate dominant NOx formation mechanism and the effects of air ratio, pressure and inlet temperature on the NOx emission at lean premixed flames. From the computations, it is cleared that prompt NOx formation mechanism is the dominant mechanism even at lean premixed combustion when flame temperature is relatively low. Pressure effect on NOx emission is small when pressure is lower than 5atm. As for the effects of inlet temperature and air ratio, burnt gas temperature is more effective than inlet temperature and air ratio and NOx emission can be suppressed by keeping burnt gas temperature under 1800K.[figure]
- 一般社団法人日本機械学会の論文
著者
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Kinoshita Shinichi
Department Of Fermentation Technology Faculty Of Engineering Osaka University
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Takagi Toshimi
Department Of Mechanophysics Engineering Osaka University
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Okamoto Tatsuyuki
Department Of Biopharmaceutics Graduate School Of Pharmaceutical Sciences Osaka University:departmen
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Okamoto Tatsuyuki
Department Of Mechanophysics Engineering Osaka University
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Takagi Toshimi
Department Of Mechanical Engineering Alty Of Engineering. Osaka University
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SHIOTANI HITOSHI
Department of Mechanophysics Engineering Osaka University
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TERAOKA HIRONOBU
Department of Mechanophysics Engineering Osaka University
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Kinoshita Shinichi
Department Of Chemical Process Engineering Faculty Of Engineering Hokkaido University
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Kinoshita Shinichi
Department Of Mechanophysics Engineering Osaka University
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