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Jenbacher 312’s waste heat up to 67kWe, boosting the efficiency of the power plant by more than 10%. The waste heat is provided by a 635kW GE Jenbacher engine running on biogas, with exhaust heat used to generate steam for the small steam engine. The Green Machine acts as the condenser on the steam engine, eliminating the need for a cooling loop and thereby increasing the steam engine’s efficiency. The Green Machine utilizes the low temperature (90°C) heat to generate up to 35kWe, nearly doubling the output from the steam engine alone. The power generated from the waste heat meets the German heat utilization requirements to earn renewable energy credits resulting in a very strong ROI for the Green Machine of approximately 3.5 years for the plant owner. The GE Jenbacher engine runs off the biogas produced by a corn/manure mix. The exhaust heat is used to generate steam for the small steam engine. The waste heat from the cooling of the steam engine is combined back into the engines jacket water circuit. The Green Machine uses the heat from the jacket water and the additional heat from the steam engine to further increase power output and efficiency of the Jenbacher engine. The Green Machine ORC uses direct air condensing for the cooling, with the ambient temperature ranging between 5-30°C. “SE-TECH pioneered the combined ElectraTherm ORC/steam engine integration and its success has been proven with more than 5,000 hours runtime,” said Stefan Farwick, President of SE- TECH. “This unique configuration of two technologies ensures every kilowatt of heat is utilized to make electricity.” Site: Straznice, Czech Rep. Heat Source: GE Jenbacher 412 Engine Green Machine Gross Power Output Avg: 30-40 kWe Thermal Input to the Green Machine: ~500kW Hot Water Input Range: 94°C Hot Water Flow: 12 l/s Liquid Loop Radiator Water Temperature: -7 to 40°C In the Czech Republic, ElectraTherm, distributor GB Consulting and biogas plant constructor EnviTec Biogas commissioned an ElectraTherm Green Machine at a biogas plant to generate additional power and increase energy efficiency on site. The Green Machine uses Organic Rankine Cycle (ORC) technology to generate fuel-free, emission-free power. To date, the machine has maintained over 97% uptime. The Green Machine was added at an existing biogas power facility with a Jenbacher 412 internal combustion engine producing 844kWe. The engine is equipped with an exhaust gas heat exchanger, and is configured to have a higher jacket water temperature, which provides a combined jacket water and exhaust heat stream of 95°C. The Green Machine is the first heat loadPDF Image | Utilizing Waste Heat Incentives at Biogas Plants
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