COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP

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COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP ( combined-geothermal-heat-and-power-plants-chp )

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EGEC – EUROPEAN GEOTHERMAL ENERGY COUNCIL Fig. 5: Svartsengi power plant building on Reykjanes peninsula, Iceland The Svartsengi Plant Evolution: The first heat exchange experiments started in 1974 in a small-scale pilot plant. Deciding from results of this research, a second pilot plant was built in 1976 with enough capacity to supply the town of Grindavik with 20 l/s of hot water. The first plant in Svartsengi, called Power Plant 1, was built in 1976-78. At the time, it was the first of its kind in the World, it was the first geothermal power plant using a high temperature geothermal system for simultaneous production of hot water for district heating and electrical power. The engineering and construction of Power Plant 1 was done at the same time as it was a “fast track project.” Getting the main plant started as soon as possible was extremely important because oil prices had risen to new world-record highs and almost all houses in the region were heated with oil. Inexpensive geothermal hot water was badly needed and, therefore, design and construction proceeded simultaneously. This situation created various problems. For example, the plant’s main building was originally designed to house two heat-exchange flow streams of 37.5 l/s each. Then, it was decided to double the production capacity and install a total of four flow streams in a building originally designed for two. One of the consequences was that bulky and heavy heat exchangers had to be installed in the basement, originally designed to only house pumps. Right now, the Svartsengi geothermal power plant consists of the following : Power Plant 1 commissioned in 1977/78: The installed heat exchange capacity was 150 l/s for the district heating system, corresponding to 50 MWth thermal power. Additionally, two 1-MWe AEG back-pressure steam turbine generators were installed. In the year 2000, half of the heat exchange system was decommissioned. Power Plant 2 commissioned in 1981: The installed heat exchange capacity is 225 l/s for the district heating corresponding to 75 MWth thermal power. In Power Plant 3, a 6 MWe Fuji Electric back-pressure turbine started commercial production on January 1, 1981. 6

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