A-17 2段復水ラジアル蒸気タービンの開発(蒸気タービン,一般講演)

概要

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A 150 kW class radial inflow steam turbine system is proposed as a bottoming cycle for 2.4 MW class gas engine systems. It makes the total electrical efficiency of the system increase from 41.6 % to 44.2%. A two-stage condensing turbine system is applied to increase out power under the supplied steam conditions from exhaust heat of gas engines. Pressure ratio of the high pressure turbine is 3.5, and that of the low pressure turbine is 4.6. The blade profiles of both turbines are designed with consideration of the thrust which does not exceed 300 N at the rated rotational speed of 51,000 rpm. To reduce mechanical losses, a permanent magnet generator rotor which is composed with turbine rotors in a common shaft supported by the two water-lubricated bearings is applied. Oil supplied system is completely eliminated in the turbine system. Design specifications of the turbines are shown. Test for load condition of 80 % was carried out and stable power of 120 kW was obtained.
2010-10-20