Kajian Kelayakan Pemilihan Teknologi Reliquefaction Plant atau MSO Compressor Sebagai Alternatif Pemanfaatan Boil Off Gas (BOG) Pada FSRU 170.000 m³

Margono, Hanif Nur Fauzi (2020) Kajian Kelayakan Pemilihan Teknologi Reliquefaction Plant atau MSO Compressor Sebagai Alternatif Pemanfaatan Boil Off Gas (BOG) Pada FSRU 170.000 m³. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Boil Off Gas (BOG) merupakan gas yang terbentuk karena adanya panas yang masuk (heat leak) kedalam tangki gas alam cair atau Liquefied Natural Gas (LNG). Evaporasi yang terjadi secara terus menerus dapat meningkatkan tekanan pada tangki, sehingga dapat menyebabkan tekanan berlebih yang berbahaya. BOG tersebut harus dimanfaatkan atau dibuang melalui proses pembakaran untuk menjaga tekanan tangki muatan. BOG yang dibuang merupakan sebuah kerugian bagi perusahaan. Pada FSRU ini memiliki nilai rata – rata BOG yang dihasilkan setiap harinya sebesar 92.714,936 m³n Gas dan boil off rate 0,237%. Pemanfaatan BOG pada FSRU ini digunakan untuk bahan bakar generator DFDE dan boiler yang memiliki nilai rata – rata perharinya 837,363 MMBTU, sehingga memiliki nilai BOG berlebih sebesar 2.823,184 MMBTU/hari yang memiliki nilai US$ 28.458. Metode pemanfaatan BOG berlebih adalah dengan melakukan reliquefaction,menggunakan reliquefaction plant atau langsung menyalurkannya ke linepack offshore pipeline menggunakan MSO compressor. Dalam pemilihannya menggunakan reliquefaction plant Wartsila HGS Mark III, yang menggunakan siklus kerja inverse brayton, berkapasitas 7.000 kg/h, daya 5.500 kW, dan konsumsi bahan bakar 44,08 MMBTU/h. Sedangkan untuk MSO compressor menggunakan BOG kompresor dari Burckhard Laby GI Compressor LP250 4 stages, kapasitas 10.000 kg/h, daya 4.000 kW, dan konsumsi bahan bakar 32,056 MMBTU/h. Berdasarkan aspek ekonomis penggunaan MSO compressor memiliki nilai CAPEX dan OPEX lebih rendah, tetapi secara nilai NPV, IRR dan PP penggunaan reliquefaction plant memiliki nilai lebih baik, sedangkan berdasarkan kondisi operasional FSRU ¬reliquefaction plant lebih cocok secara teknis untuk digunakan pada FSRU ini karena sesuai dengan penggunaan jangka panjang. ==================================================================================================================== Boil Off Gas (BOG) is a gas that is formed due to heat leak into a Liquefied Natural Gas (LNG) tank. Evaporation that occurs continuously can increase the pressure on the tank, which can cause dangerous excess pressure. The BOG must be utilized or discharged through the combustion process to maintain the pressure of the cargo tank. The disposed of BOG is a loss for the company. In this FSRU generated average BOG value 92,714.936 m³n Gas/day and a boil-off rate of 0.237% The use of BOG in the FSRU is used for fuel DFDE generators and boiler which have an average daily value of 837.363 MMBTU/day so that they have an excess BOG value of 2,823.184 MMBTU/day which has a value of US$ 28.458. The method for the excess BOG handling is by doing reliquefaction, using a reliquefaction plant, or directly send it to an offshore pipeline linepack using MSO compressor. In its selection, the Wartsila HGS Mark III reliquefaction plant, which uses an inverse Brayton work cycle, has a capacity of 7,000 kg/hour, 5,500 kW of power, and fuel consumption of 44.08 MMBTU/ hour. Whereas the MSO compressor uses a BOG compressor from Burckhard Laby GI LP250 Compressor for four stages, a capacity of 10,000 kg/h, power 4,000 kW, and fuel consumption 32,056 MMBTU/hour. Based on the economic aspect, the use of the MSO compressor has lower CAPEX and OPEX values. However, in terms of NPV, IRR, and PP, the use of a reliquefaction plant has a better value, while based on the operational conditions, the reliquefaction plant is more technically suitable for this FSRU because it is in accordance with the long term use.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: LNG, FSRU, Boil Off Gas, MSO Compressor, Reliquefaction Plant. LNG, FSRU, Boil Off Gas, MSO Compressor, Reliquefaction Plant.
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC363 Floating harbors. Including floating docks, piers, etc
T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage.
T Technology > TN Mining engineering. Metallurgy > TN880.5 Natural gas pipelines
V Naval Science > VC Naval Maintenance > VC 270-279 Equipment of vessels, supplier,allowances,etc
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM293 Shipping--Indonesia--Safety measures
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Hanif Nur Fauzi Margono
Date Deposited: 23 Aug 2020 08:59
Last Modified: 23 Aug 2020 08:59
URI: http://repository.its.ac.id/id/eprint/80451

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