Two-stage turbocharged gas engine

Paul Boughton
Responding to growing global demand for high-efficiency power generation, GE has developed the world’s first two-stage turbocharged gas engine and is applying this game-changing technology to its Jenbacher J624 gas engine. The new engine provides significant output and efficiency increases compared to the single turbocharged version and is particularly well-suited for operation in hot environments and combined heat and power (CHP) applications.
It was introduced at an official product launch event held today at GE’s Jenbacher headquarters in Jenbach, Austria, which more than 35 customers and distributors attended. Representatives from the pilot customer for the first new engine, Red Harvest, a large Dutch greenhouse plant operator, also attended the event.
With the new system, which GE developed with specialists from ABB Turbo Systems Ltd, the J624 achieves approximately 10per cent higher output, increasing from 4 megawatts (MW) to 4.4 MW and offers an electrical efficiency of 46.5 per cent, an increase of about 1per centage.-point Improved efficiency is critical for the competitive cost of electricity and for the reduction of CO2 emissions in a carbon-constrained environment.
The two-stage turbocharging offers a much higher charging efficiency, which significantly contributes to the engine’s overall increased efficiency.
In addition to the higher charging pressure, this technology also significantly improves the power density of the engine allowing it to run beyond 22 bar BMEP[1] <#_ftn1>  (brake mean effective pressure).
Applications for the new two-stage turbocharged gas engine include Independent Power Producer, CHP, trigeneration and special applications using natural gas fuel, as well as a wide range of non-natural gas fuels. The new engine will be available to customers worldwide by the summer of 2011.
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