Ahmad Zaky, Hasan (2021) Analisa Laju Pembentukan Boil of Gas dalam LNG Storage Tank pada Harbour Tug Diesel - LNG Dual Fuel Engine 2 x 2500 HP. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada zaman modern ini penggunaan bahan bakar konvesional sudah banyak digantikan dengan bahan bakar yang memiliki tingkat emisi yang lebih rendah dan biaya bahan bakar yang lebih murah, salah satunya adalah bahan bakar LNG (liquified natural gas). Dalam metode penyimpanan pada bahan bakar natural gas (metahne), bajan bakar tersebut didinginkan sampai dengan fase cair (Liquefied), dalam keadaan cairnya, Methane dapat menyusut volume sampai dengan 1/600 dibandingkan dengan fase gas. Pada penelitian ini dilakukan Analisa boiling pada bahan bakar LNG pada tangki kapal Harbour Tug - LNG Dual Fuel Engine 2 x 2500 HP, hal ini dilakukan untuk mengetahui nilai perubahan fase LNG dari cair ke gas sehingga dapat mengetahui tingkat tekanan pada tangki yang dimana akan mempengaruhi nilai safety pada kapal. Desain tangki yang sudah sedemikian rupa pada kondisi aktualnya akan tetap terjadi BOG (Boil of Gas) walaupun menggunakan beberapa lapis material, hal ini tetap terjadi karena adanya Losses Heat akibat paparan panas konveksi atmosfer. Analisa yang dilakukan dicari menggunakan aplikasi CFD (Computational Fluid Dynamics) yaitu perhitungan secara numerik. Adapun hasil dari percobaan kapal tidak beroperasi tersebut yaitu sebesar (dari penuh sampai seperempat penuh) 0.447 m3/min, 0.6075 m3/min, 0.612 m3/min, dan 0.585 m3/min. sedangkan untuk hasil saat kapal beroperasi adalah -0.428 m3/min pada full speed, -0.430 m3/min pada economy speed, -0.436 m3/min pada slow speed, -0.426 m3/min pada manoeuvering speed, dan -0.427 m3/min pada towing. Dari percobaan tersebut dapat dinyatakan nilai BOG (Boil of Gas) berbanding lurus dengan nilai tekanan yang berada didalam tangki.
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In this modern era, the use of conventional fuels has been replaced by fuels that have lower emission levels and cheaper fuel costs, one of which is LNG (liquified natural gas) fuel. In the storage method for LNG fuel, the method needed is by cooling the LNG to the liquid phase (liquefied). In liquid state, LNG can shrink in volume up to 1/600 compared to the gas phase. In this study, boiling analysis was carried out on LNG fuel in the Harbor Tug - LNG Dual Fuel Engine 2 x 2500 HP vessel tank, this was done to determine the value of the LNG phase change from liquid to gas so that it can determine the pressure level in the tank which will affect the value of the LNG safety on the ship. The tank design is already in such a way that in actual conditions it will still occur BOG (Boil of Gas) even though it uses several layers of material, this still occurs because of the Losses Heat due to exposure to atmospheric convection heat. The analysis carried out is searched using the CFD (Computational Fluid Dynamics) application, which is a numerical calculation. The results from the experiment of the non-operating vessel were (from full to one-quarter full) 0.447 m3/min, 0.6075 m3/min, 0.612 m3/min, and 0.585 m3/min. while the results when the ship is operating are -0.428 m3/min at full speed, -0.430 m3/min at economy speed, -0.436 m3/min at slow speed, -0.426 m3/min at maneuvering speed, and -0.427 m3/min at towing. From these experiments, it can be stated that the BOG (Boil of Gas) value is directly proportional to the pressure value in the tank.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Boil of Gas, Heat flux, liquified natural gas, Tekanan, flow rate |
| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TS Manufactures > TS283 Pressure vessels. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | Hasan Ahmad Zaky |
| Date Deposited: | 02 Sep 2021 03:39 |
| Last Modified: | 25 Jul 2024 01:47 |
| URI: | http://repository.its.ac.id/id/eprint/91570 |
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