Kajian Kelayakan Pemilihan Teknologi Reliquefaction Plant atau MSO Compressor Sebagai Alternatif Pemanfaatan Boil Off Gas (BOG) Pada FSRU 170.000 m³
Submission Date: 2020-08-22 13:08:17
Accepted Date: 2021-02-01 10:56:36
Abstract
Boil Off Gas (BOG) merupakan gas yang terbentuk karena adanya panas yang masuk (heat leak) kedalam tangki Liquefied Natural Gas (LNG). Evaporasi yang terjadi secara terus menerus dapat meningkatkan tekanan pada tangki, 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 perharinya sebesar 92.714,936 m³n Gas dan boil off rate 0,237%. Pemanfaatan BOG pada FSRU digunakan untuk bahan bakar generator DFDE dan boiler dengan nilai rata – rata perharinya 837,363 MMBTU, sehingga memiliki nilai BOG berlebih rata – rata perharinya 2.823,184 MMBTU. Metode pemanfaatan BOG berlebih dengan melakukan reliquefaction, atau langsung menyalurkannya ke linepack offshore pipeline menggunakan MSO compressor. Dalam pemilihannya, menggunakan reliquefaction plant Wartsila HGS Mark III, menggunakan siklus kerja inverse brayton, berkapasitas 7.000 kg/h. Sedangkan untuk MSO compressor menggunakan BOG kompresor Burckhard Laby GI Compressor LP250 4 stages, kapasitas 10.000 kg/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.
Keywords
Boil Off Gas; FSRU; LNG; MSO Compressor; Reliquefaction Plant.
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