THERMODYNAMIC STUDY OF DIRECT CONTACT CONDENSER IN UNIT 4 KAMOJANG GEOTHERMAL POWER PLANT

• Main Author: FARDIAS MU’MIN (NIM : 13107030); Pembimbing Utama : Dr. Ir. Ari Darmawan Pasek, GEA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15759
• Institution: Institut Teknologi Bandung

Geothermal energy is one of renewable energy sources, because the process of its formation would occur continuously if its hidrologis and geologic conditions are maintained always in balance. The potential of geothermal development in Indonesia is also very large, because of Indonesia's proven geothermal potential to this day is 28 GWe or equivalent with 12 billion barrels of petroleum within 30 years of operations. Therefore, the government launched a program to improve the production of geothermal power plant with target of 9,500 MW by 2025. One of the geothermal power plant that supports these programs are Unit 4 Kamojang Geothermal Power Plant. Unit 4 Kamojang geothermal power plant is owned and operated by PT Pertamina Geothermal Energy (PT PGE) with a production capacity of 60 MW. Party operators, in this case PT PGE, trying to continously improve the efficiency and productivity of their power plant. Increased production of power plant can be obtained by lowering the pressure in the condenser. But before determining the value of pressure decrease in the condenser, firstly thermodynamic models calculation must be done using the Microsoft Excel Visual Basic Macro Analysis (VBA) software. This calculation is to determine the current condition of the power plant. The result then validated by desain and actual data. Next step to do is specificaly calculate parameters of the condenser and determines which conditions are best for the condenser operating scheme. Condenser operating conditions obtained from the amount of water needed to condensate steam out of the turbine at various pressure conditions that might be achieved. The pressure in the condenser can be decrease from the design conditions of 0.160 bar to 0.135 bar by increasing the flow rate of cooling water to the condenser of 7600 m3 / h to 8000 m3 / h at cooling water temperature 260C. The pressure decrease in condenser resulting net power increase by 1.97 MW. In addition, thermal efficiency and utility of the power plant also increased respectively by 0.59% and 1.94%. Specific Steam Consumption (SSC) or the amount of steam required for the production of each Mega Watt electricity is also reduced by 0.22 tons / MWh. Difference in gains from the increase in power amounted to $ 21,879,828,- or equal to Rp 194,730,470,862, - within 27 years of operation.