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10 MW GE Jenbacher Engine Starts Up

Largest GE Jenbacher gas engine enters operation in Germany cogeneration plant; part of national move toward natural gas and renewable energy

Posted on May 10, 2013

The first GE Jenbacher J920 Flextra gas engine has been commissioned for the upgrading of the combined heat and power (CHP) plant of Bavarian utility Stadtwerke Rosenheim. The engine joined three J620 and one two-stage turbocharged J624 Jenbacher gas engines to deliver about 40% of the electricity needs and 20% of the heating demand for the city of Rosenheim, Germany.

The upgrading of the Rosenheim facility fits into the German energy transition plan – which includes moving completely away from nuclear power by 2022 and increasing the energy share from natural gas and renewable sources – and contributes to the country’s target of increasing CHP power generation to 25%.

The J920 Flextra features a two-stage turbocharger which delivers about 75% super-charge efficiency and allows for optimized Miller technology. The engine is natural-gas powered and is equipped with a pre-chamber combustion system with spark ignition and port injection with individual gas admission valves and sensors per cylinder to allow the monitoring and optimization of every cylinder individually. The twenty-cylinder J920 FleXtra has a 48.7% efficiency capability while in cogeneration mode, GE said.

With this efficiency performance, GE said that operating a J920 FleXtra gas engine will produce almost 76 million kW/yr of electricity, enough to power more than 18 500 European households. In cogeneration mode, the J920 FleXtra saves more than 130 million kWh in primary energy and over 7076 tonnes of CO2 emissions, the company said.

The company added that the 60 Hz version of the twenty-cylinder engine is expected to be available in 2014.