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EGEC – EUROPEAN GEOTHERMAL ENERGY COUNCIL STATE OF THE ART Use of low-temperature resources: Neustadt-Glewe geothermal heating plant The Neustadt-Glewe geothermal heating plant was commissioned in January 1995, supplying exclusively in direct-heat transition the base load of a district heating system amounting to a thermal output of approximately 11 MWth, thus covering the demand of a major part of the town of Neustadt-Glewe in northeastern Germany. The installed geothermal capacity is 6 MWth; a gas-fired boiler unit is operated to cover the peak-load. The site of Neustadt-Glewe is characterized by the then deepest wells, the highest thermal water temperature and water mineralization compared to all the other geothermal plants installed in Germany by now. In 2003, the plant was extended by a power generation unit of 210 kWe gross. This is the first geothermal electric generation plant in Germany, and uses only 98 °C water, the lowest temperature used in the world. Since 1995, the geothermal doublet in Neustadt-Glewe provides brine at 98 °C for a district heating system. The brine is produced from a 2100 to 2300 m deep sandstone aquifer. High salt contents of the brine (total dissolved solids = 227 g/l) require the use of resistant materials (e.g., titanium) for the heat exchanger equipment. In the summer of 2003, the heating plant was extended by a binary-cycle power generation (Organic Rankine Cycle, ORC) and in November of 2003, the first German geothermal power plant was connected to the grid, providing 210 kWe gross capacity (performance guarantee, according to Erdwãrme Kraft (2003)). A measuring scheme was installed to supervise the plant performance and to get operational data of the very low temperature ORC. Plant setup The Neustadt-Glewe plant (fig. 1) supplies heat and power using a parallel-series connection of power plant and heating station (fig. 2). The heating station takes priority over the power plant. Fig. 1: Geothermal plant layout (left side, from left to right: wellhead and filter building, container with ORC plant, cooling tower, container with water treatment for cooling tower) and ORC plant (right side) 3PDF Image | COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP
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