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LOW-ENTHALPY POWER GENERATION WITH ORC-TURBOGENERATOR

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LOW-ENTHALPY POWER GENERATION WITH ORC-TURBOGENERATOR ( low-enthalpy-power-generation-with-orc-turbogenerator )

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Table 1. Altheim ORC Turbogenerator Performance Data Sheet Geothermal water inlet temperature: Geothermal water outlet temperature Geothermal water flow rate: Cooling water flow rate (about): Cooling water inlet temperature: Cooling water outlet temperature: Electric generator: Net electric power output: Table 2. Expenses for the Project Electricity power plant Reinject. drillh. / Completion prod. drillh. Underwater product.- / Inject.- installation Further expenses Total expenses 106 oC (223 oF) 70 oC (158oF) 81.7 kg/s (1,295 gpm) 340 kg/s (5,389 gpm) 10 oC (50oF) 18 oC (64oF) synchronous,.low voltage 1,000 kW 1,580,000 EURO (1,422,00 US$) 2,117,000 EURO (1,905,000 US$) 378,000 EURO (340,000 US$) 436,000 EURO (392,000 US$) 4,511,000 EURO (4,060,000 US$) Table 3. Yearly costs Production costs per MWh 91.47 EURO (82.32 US$) Yearly/Production Costs (Due to the funding of the European Commission, the continuous expenses could be reduced to the following numbers) 349,861 EURO (315,000 US$) Table 4. Winter - Winter - Summer - Summer- Input Tariff per kWh (fixed price guaranteed for 15 years) ATS* EURO** US$ 0.0523 0.0445 0.0441 0.0397 0.0344 0.0310 0.0306 0.0275 High rate Low rate High rate Low rate 0.72 0.607 0.473 0.421 * ATS = Austrian Schilling (1US$ = 15.4 ATS) ** 1 EURO = 0.90 US$ plant was shut down after a short time. After installation of additional filters in the cooling water system, the plant started operation again in January 2001. At this time, the highest capacity of the plant was 1027 kWe. Unfortunately, after a few days the plant had to be shut down again. The reason was damage to some of the turbine blades. After changing of all turbine blades, the plant was restarted at the beginning of March 2001. During the following period, the plant had good performance–the capacity to the public grid was more than 500 kWe (peak 564 kWe). In April and May, problems emerged again–both in the condenser and the turbine. The aproximately 5,000 copper pipes in the condenser were changed and the turbine was fitted with new blades (a reduced number with a modified shape). Since December 2001, the plant has been in operation again. The highest capacity to the grid was 414 kWe. The current thermal water flow rate is about 85 L/s–up to half of it goes to the district heating. After winter when the demand of the district heating systems is decreased, the capacity to the grid can be increased up to 500 kWe. To improve the clarification of the cooling water, an automatic flushing filter system will be installed in the next months. Since January 2001, the following quantities of power have been supplied to the grid. Period January 2001 March 2001 April 2001 May 2001 December 2001 January 2002 kWhe Max. Capacity in kWe 40,907 545 132,694 545 115,103 564 99,67 530 64,818 360 171 414 28 GHC BULLETIN, MARCH 2002 About 63% of the gross power production of the plant is supplied to the grid of the electricity company Energie AG Oberösterreich. The remaining power is used for the submersible pump, the pump to increase the pressure in the injection borehole, the cooling water pumps and other auxiliaries. The submersible pump is also necessary to maintain a stable operation of the district heating; otherwise, other pumps in the central station have to be used.

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