TECHNO-ECONOMIC STUDY OF HYDROGEN PRODUCTION SYSTEM WITH BRINE UTILIZATION TECHNOLOGY AT ULUBELU GEOTHERMAL POWER PLANT
Hydrogen has the potential to replace fossil energy in the future with its nature as an energy carrier so that it is easy to convert to other forms of energy. Utilization of geothermal energy and water in the electrolysis process is an environmentally friendly hydrogen production method. Ulubelu Geo...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/70108 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Hydrogen has the potential to replace fossil energy in the future with its nature as an energy carrier so that it is easy to convert to other forms of energy. Utilization of geothermal energy and water in the electrolysis process is an environmentally friendly hydrogen production method. Ulubelu Geothermal Power Plant (GPP) has a waste brine energy potential brine potential of 763 kg/s with a pressure of 8.7 bar and a temperature of 174ºC to be used as a hydrogen generation through brine utilization technology in the form of a Thermoelectric Generator (TEG) and Organic Rankine Cycle (ORC) in a hybrid manner. TEG is designed as a concentric circular thermoelectric generator (CCTEG) model in a double pipe heat exchanger with brine as the hot fluid and water from the cooling tower as the cold fluid. In previous studies, ORC technology using ammonia fluid with a closed water cycle has been conducted as an economic feasibility study.
This study aims to obtain modeling of an economically feasible hydrogen production system using brine utilization technology. Modifying the cooling tower system is required to supply cooling water to the TEG, which affects the Primary Auxillary Cooling Water Pump (PACWP) performance. The modeling of a hydrogen production system using a Proton Exchange Membrane (PEM) type electrolyzer with the hydrogen production capacity adjusted to the system's power. The economic feasibility study is conducted on the electricity price of the Ulubelu GPP and the price of electricity by the Minister of Energy and Mineral Resources Regulation No. 17 of 2014. Investment feasibility parameters will be present from the parameters of Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period, and Levelized Cost of Hydrogen (LCoH).
The results showed that modifying the cooling tower and PACWP to deliver 205.88 kg/s of water to TEG increased power by 88 kW. The results of the TEG design produced 538.25 kW with a tube length of 32 meters. Modeling using ORC with electricity prices refers to the Minister of Energy and Mineral Resources Regulation No. 17 of 2014 at a hydrogen capacity of 1000 kg/day has the best investment criteria compared to using TEG and combinations. The Investments over 20 years resulted in an NPV of $7,464,287, an IRR of 15.5%, and a payback period of 7 operating years with an LCoH of 4.15 $/kg.
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