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22 January 2007 -- GE Energy's Jenbacher gas engine business was recently awarded a contract to supply two combined heat and power (CHP) units for a new wood gas project in the town of Oberwart in the Austrian province of Burgenland.
A Jenbacher CHP unit is in use in the nearby town of Güssing, which also is using wood gas for power and heat. For the new project, GE Energy is supplying two Jenbacher JMS 612 GS-S/N.L engines to Ortner GmbH, which is the main contractor commissioned to design and construct the entire plant on behalf of Energie Oberwart Errichtungs-GmbH. Ortner GmbH is responsible for the overall engineering, construction, systems engineering, and instrumentation and control equipment. The project is supported by the Vienna University of Technology's Institute of Chemical Engineering.
The plant is expected to be commissioned in November 2007, providing an electrical output of about 2 MW and thermal output of 6 MW. The generated heat will be fed into the district heating system operated by Energie Oberwart, supplying heating to the local hospital and future facilities in the industrial area of Nord. The plant's produced electricity will be fed into the local public grid.
Part of the electrical power will be obtained from exhaust gas heat using an organic Rankine cycle, or ORC process. According to GE, the ORC process is based on a process similar to the water/steam cycle, but instead of water, it utilizes an organic working medium with superior volatility properties to water. The produced steam from the ORC process is used to drive a steam turbine that generates electricity by means of a generator.
A fluidized steam gasifier first converts the wood into a low-tar gas with a calorific value of 2.7 kWh/m3N and a comparatively high hydrogen content (30 to 40 percent vol.). The two Jenbacher engines will produce electrical power from this wood gas, while the exhaust heat from the engines is used for the ORC process and district heating.
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