The Chociwel region is part of the Szczecin Trough and constitutes the northeastern segment of the extended Szczecin- Gorzów Synclinorium . Lower Jurassic reservoirs of high permeability of up to 1145 mD can discharge geothermal waters with a rate exceeding 250 m3/h and temperatures reach over 90°C in the lowermost part of the reservoirs. These conditions provide an opportunity to generate electricity from heat accumulated in geothermal waters using binary ORC (Organic Rankine Cycle) systems. A numerical model of the natural state and exploitation conditions was created for the Chociwel area with the use of TOUGH2 geothermal simulator (i.e., integral finite-difference method). An analysis of geological and hydrogeothermal data indicates that the best conditions are found to the southeast of the town of Chociwel, where the bottom part of the reservoir reaches 3 km below ground . This would require drilling two new wells, namely one production and one injection. Simulated production with a flow rate of 275 m3/h, a temperature of 89°C at the wellhead, 30°C injection temperature and wells being 1.2 km separated from each other leads to a small temperature drop and moderate requirements for pumping power over a 50 years’ time span. The ORC binary system can produce at maximum 592.5 kW gross power with the R227ea found as the most suitable working fluid. Geothermal brine leaving the ORC system with a temperature c. 53°C can be used for other purposes, namely mushroom growing, balneology, swimming pools, soil warming, de-icing, fish farming and for heat pumps.
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Przedstawiono model matematyczny trzech wariantów elektrowni: z układem parowo-wodnym (referencyjnym) oraz dwóch wariantów układów binarnych (woda - R245ca): hybrydowych zasilanych paliwem kopalnym oraz współzasilanych energią wody geotermalnej. Na podstawie przeprowadzonych analiz wariantów elektrowni stwierdzono, że zastosowanie czynnika organicznego w układzie binarnym pozwala na zwiększenie udziału niskotemperaturowej energii geotermalnej w całkowitym strumieniu energii doprowadzanej do układu oraz uzyskanie wymiernych korzyści w postaci większej mocy elektrowni.
EN
The paper presents a mathematical model of three variants of a. power plant: a steam power plant using fossil fuel and waste energy, and a binary power plant with water and R.245ca as working media, powered with fossil fuel and co-powered with geothermal energy. Based on the calculations performed, the following conclusion can be drawn: the use of organic medium in a binary power plant allows for an increase of low-temperature goothermal/waste energy share in the total energy flux supplied to the plant and for obtaining measurable benefits in the form of higher output of the power plant.
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