TECHNO ECONOMIC ANALYSIS OF COMBINED ORGANIC RANKINE CYCLE AND LNG REGASIFICATION SYSTEM FOR POWER PLANT GAS SUPPLY

• Main Author: Habib Chusnul Fikri, M
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/37885
• Institution: Institut Teknologi Bandung

Necessity for long term electricity development is being forced by PLN requirement to develop efficient investment plan, as stated in Indonesia’s Power Supply Business Plan (RUPTL) 2018. This thing is important to be done because investment decision in the electrical power supply industry benefits, will be demanded in a long term period. Lowest electricity cost will be acquired by minimizing net present value of all electricity cost components consits of capital cost, fuel cost, operation and maintenance cost. PLN is planning new power plants that will be operated using LNG or gas fuel. In this study, the analysis will be conducted about design of LNG regasification system by using organic rankine cycle that utilize sea water as the heat source, therefore there will be a working cycle that utilize sea water as the heat reservoir and LNG flow as cold reservoir. The research metode is by create, calulate and simulate the thermodynamic cycle of combined organic rankine cycle and LNG regasification system, also then calculate the capital cost and operation cost of the system. The choice of organic fluid are propana, ethana, butana, R32 and R41. From the result can be known that the combined organic rankine cycle and LNG regasification system with lowest cost over production ratio is the one that utilize R41 as working fluid. Then followed by ethana, propana R32 and butana. From the result also can be known that the ORC system with highest exergy efficiency is the one that utilize R41 as working fluid. Then followed by the one that utilize R32, propana, ethana and butana respectively. Combined LNG regasification and ORC system with propane as working fluid can be an option, when it is required to create a system with high power production and environement friendly working fluid. From the study result, it is known that the combined LNG regasification and ORC system with butane as working fluid, provide cheapest capital cost and operatio cost, however also provide highest cost over power production ratio. Therefore, system with butane as working fluid may be a better option if its only required to create LNG regasification without additional power cycle.