A master thesis from Aalborg University
Utilisation of geothermal energy
[Udnyttelse af geotermisk energi]
Author(s)
Term
4. term
Education
Publication year
2017
Submitted on
2017-06-01
Pages
86 pages
Abstract
This project concerns modelling a geothermal power plant which can be used in most places around the world in geothermal areas with high enough temperatures for electricity generation. Three types of units was modelled. The binary cycle, the single flash and the double flash. The units was modelled in such a manner that it can be utilised independent of geothermal field. A parameter optimisation of the three unit was conducted. The pressures in the units was optimised to find the configurations which would give the highest electrical power output. For the binary cycle unit this was found to be 20 bar in the evaporator and 4.65 bar in the condenser which gave 8.64 MWe. For the single flash the power output was 14.3 MWe, where the separator pressure was 3.21 bar and the condenser pressure was 0.1 bar. The double flash optimisation gave a power output at 52.4 MWe at a HP separator pressure at 12.7 bar, a LP separator pressure at 2.67 bar and the HP and LP condenser pressure was 0.1 bar. The optimised unit configurations was used to design at power plant. This was done with one binary cycle, one single flash with a bottom binary cycle and a double flash with a bottom binary cycle. District heating was also added to this model. The results for the power plant model was 91.8 MWe and 610 MWth. This is 21.4 MWe higher than if the units was not combined.
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