| Title | Kamojang Geothermal Power Plant Unit 1-2-3 Evaluation and Optimization Based on Exergy Analysis |
|---|---|
| Authors | Reza ADIPRANA, Danu S. PURNOMO, Irwan E. LUBIS, Prihadi S. DARMANTO |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | Exergy, efficiency, losses, modification, overall equipment effectiveness |
| Abstract | THE development of Kamojang Unit 1-2-3 since the 1980’s marked the first utilization of Indonesia’s geothermal field. Kamojang Unit 1-2-3 constantly produces 140,000 kWe with high quality Equivalent Availability Factor (EAF) of 93% in average which comes from 1,000 T/h steam supply. Within production period, Kamojang reservoir pressure and temperature decreases around 9.3 bar abs and 19°C from its initial condition which affects the production rate of 3% decrement per year. In term of overall sustainability of Kamojang geothermal field, especially from the power plant perspective, concerns arise to improve power plant efficiency. Exergy analysis method is used to describe and determine the overall system losses. Based on exergy analysis, Kamojang Unit 1-2-3 has system losses about 104,431 kW of exergy and exergy efficiency of 57.62%. Condenser correspond the largest loss from the system of more than 30% of exergy. The improvement were estimated on cooling tower system, that cooling water outlet temperature slightly change from its existing condition of 33°C into 29.44°C. This can be done by modify the water inlet flow rate to 90% (11,160 m3/h) and increase air inlet flow rate to 110% (11,107.49 m3/h). The result shows turbine steam flow rate decrement of about 3.22 kg/s or 11.59 T/h for a single unit. |