UTILIZATION STUDY OF EXCESS STEAM FROM VENT VALVE IN PLTP KAMOJANG

• Main Author: Sundari, Putri
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/37857
• Institution: Institut Teknologi Bandung

This research discussed an opportunity utilization of excess steam from vent valve in PLTP Kamojang as a new geothermal power plant uses dry steam cycle, binary cycle and Kalina cycle. The initial stage of this research was to modelling three cycle using Aspen-Hysys to obtain the properties of state corresponding with mass and energy balance. Thermodynamics analysis was carried out and the result showed dry steam cycle generated power of 12,520 kW, the exergy efficiency was found 58.95% with a turbine as the largest source of irreversibility reached 2,029 kW. The Kalina cycle generated less power of 7,811 kW with exergy efficiency 36.98% and the components that become the biggest irreversibility are turbine and evaporator 2 of 2,769 kW dan 2,505 kW respectively. The binary cycle has the lowest power output compare with the others of 3,942 kW, exergy efficiency of cycle reached 18.66% with the preheater as the biggest source of irreversibility of 4,033 kW. The results were then optimized by varying parameter and resulting power generated in dry steam cycle increased to 13,160 kW, Kalina cycle increased to 10,355 kW and binary cycle increased to 7,170 kW. The performance of power plant is evaluated by calculating the capacity factor (CF) which compare the actual electrical energy output over a potential output while power plant operate at full capacity in a given period. Based on CF evaluation, binary cycle has the best performance, followed by Kalina cycle and dry steam cycle. Furthermore, determining the price of electricity or levelized electricity generating cost (LEGC) generalized trough economic analysis and the results showed dry steam cycle generated LEGC of 7.78 ¢US$/kWh , Kalina cycle of 9.30 ¢US$/kWh and binary cycle of 11.51 ¢US$/kWh. Consideration of environmental impact also evaluated in this study, the dry steam cycle produced CO2 of 8,088.98 tons / year and H2S of 16.18 tons / year, while the Kalina cycle and binary cycle did not produce emissions.