Exergy analysis and optimization of Dieng single-flash geothermal power plant
2014
Pambudi, Nugroho Agung | Itoi, Ryuichi | Jalilinasrabady, Saeid | Jaelani, Khasani
Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the separator, turbine, condenser, and for the whole power plant.The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52MW. This amount of fluid produces 21.71MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70MW) of the total available exergy, which is disposed of in the plant’s reservoir. The optimization of the plant is carried out by adjusting the separator pressure. The results show that a slight increase of 20kW in the output power can be attained by lowering the separator pressure to 9bar from 10bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and separator losses are 7.51MW (12.62%) and 8.04MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62MW (4.40%). The total condenser loss is 5.8MW (9.75%).
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