Yulianto, Danan Tri (2021) Studi Numerik Efek Gas Mixing Terhadap Kestabilan Pembakaran Pada Turbin Gas Blok 3&4 Pltg Muara Tawar. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Unit pembangkit yang dikelola oleh PT PJB UP Muara Tawar merupakan unit pembangkit pemikul beban puncak (peaker) dengan pola operasi start-stop secara berkala. Blok 3 dan 4 mengoperasikan turbin gas yang memiliki tipe V 94.2 Siemens. Bahan bakar turbin gas berasal dari 3 supplier yaitu; Nusantara Regas (NR), Pertamina EP (PEP) dan PGN dengan masing-masing komposisinya.
Kestabilan pembakaran dalam turbin gas menjadi kunci keandalan operasi sehingga harus dijaga dari terjadinya gangguan. Penelitian ini bertujuan untuk mengetahui kestabilan pembakaran dengan parameter lift off, blow off maupun efek zona resirkulasi terhadap variasi bahan bakar dan udara. Selain itu dianalisa terkait distribusi temperature yang akan mempengaruhi efisiensi pembakaran dan tingkat emisi NOx.
Analisa pembakaran menunjukkan penambahan kandungan metan mengakibatkan semakin turun jarak flame lift mengindikasikan pembakaran rentan terjadinya blow out. Sedangkan penambahan udara berlebih mengakibatkan lift off semakin menjauhi burner. Adanya aliran swirl dengan jumlah yang tepat membantu menstabilkan pembakaran dengan memberikan efek resirkulasi sehingga reaksi pembakaran bisa lebih merata. Emisi NOx paling besar diakibatkan faktor temperature dimana semakin tinggi emisi NOx akan semakin besar. Secara umum penambahan udara 15% dengan bahan bakar medium composition memberikan nilai kestabilan pembakaran, energi dan emisi paling optimal.
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The power plants managed by PT PJB UP Muara Tawar is a peak load power plant’s type with a regular start-stop operation. Blocks 3 and 4 operate gas turbines with Siemens V94.2’s type. Gas turbine fuel gas comes from 3 suppliers, namely; Nusantara Regas (NR), Pertamina EP (PEP) and PGN with their respective compositions.
Stability of combustion in the gas turbine is the key in operation so it must be maintained from any disturbances.
This study aims to determine the stability of combustion with some parameters; lift off, blow off and the effect of the recirculation zone on fuel and air. In addition, this study also analyzed gas composition and excess air that effected the temperature distribution and NOx emission.
The analysis shows that increasing the addition of methane will increase the distance and becomes near to the burner then will lead to blow off. The effect of excess air will lead the lift off becomes shorter when the air ratio increasing. The presence of the right amount air swirl flow will create vortex recirculatiob that helps the combustion stability by providing a recirculation effect. The largest NOx emission produce by higher combustion temperature that react to produce more NOx emission. In general, with an addition of excess air with 15% in medium composition will provide optimal combustion stability, energy and NOx emission values.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | natural gas, AFR, stability, lift off, blow off, temperature, combustor, NOx, natural gas, AFR, turbin gas, kestabilan, lift off, blow off, resirkulasi, temperature, combustor, NOx |
| Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers T Technology > TJ Mechanical engineering and machinery > TJ778 Gas turbines |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Danan Tri Yulianto |
| Date Deposited: | 24 Aug 2021 03:19 |
| Last Modified: | 25 Aug 2021 06:49 |
| URI: | http://repository.its.ac.id/id/eprint/89826 |
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