| Authors: |
Alvin K. BETT, Eric K ROP, Saeid JALILINASRABADY and Ryuchi ITOI |
| Keywords: |
binary, geothermal, energy, exergy, efficiency |
| Conference: |
World Geothermal Congress |
Session: |
Power Generation |
| Year: |
2020 |
Language: |
English |
| Abstract: |
Olkaria I geothermal power plant in Kenya has an installation capacity of 45 MWe. This single-flash power plant has exergy waste of about 6 MWe in the separated brine. To maximize the geothermal resource, a binary unit using isobutane as a working fluid was developed and optimized using Engineers Equation Solver code. The paper presents the design and energy and exergy analysis of the proposed binary unit for the Olkaria I power plant. The designed binary plant has the potential of generating net turbine work of 2281 kW with plant efficiency of 10.81%, cycle efficiency of 9.87%, and overall utilization efficiency of 31.70%. The temperature of brine reinjected into the reservoir was set at 85 ï‚°C with exergy of 1763 kW. A Grassmann exergy flow diagram shows that exergy destruction is greatest in the condenser (12.08%) and least in the evaporator (8.99%). Energy and exergy analysis of a plant help to optimize available geothermal resources for maximum energy production. |
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File Size: |
1489 KB |