A 300 kWe class gas turbine which has a two-shaft and simple-cycle has been developed to apply to co-generation systems. The gas turbine engine is operated in the range of about 30% partial load to 100% load. The gas turbine combustor requires a wide range of stable operations and low NO{sub}x characteristics. A double staged lean premixed combustor, which has a primary combustion duct made of Si{sub}3N{sub}4 ceramics, was developed to meet NO{sub}x regulations of less than 80 ppm (corrected at 0% oxygen). The gas turbine with the combustor has demonstrated superior low-emission performance of around 40 ppm (corrected at 0% oxygen) of NO{sub}x, and more than 99.5% of combustion efficiency between 30% and 100% of engine load. Endurance testing has demonstrated stable high combustion performance over 3,000 hours in spite of a wide compressor inlet air temperature (CIT) range of 5 to 35 degree C. While increasing the gas generator turbine speed, the flow rate of primary fuel was controlled to hold a constant equivalence ratio of around 0.5 in the CIT range of more than 15 C. The output power was also decreased while increasing the CIT, in order to keep a constant temperature at the turbine inlet. The NO{sub}x decreases in the CIT range of more than 15 C. On the other hand, the NO{sub}x increases in the CIT range of less than 15 C when the output power was kept a constant maximum power. As a result, NO{sub}x emission has a peak value of about 40 ppm at 15 C.
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