Nursalam, M. Farid (2024) Studi Numerik Pengaruh Ukuran Partikel Batubara Terhadap Karakteristik Aliran Dan Pembakaran Pada Front-Rear Burner Boiler 600mw Pada Kondisi Overheating. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Hingga saat ini, PLTU tetap mendominasi sebagai penyedia energi listrik utama dengan kapasitas pembangkit listrik yang terpasang sebesar 20.419 MW tercatat pada akhir tahun 2022 oleh PT PLN. Dalam operasional boiler terdapat gangguan yang dapat menurunkan unjuk kerja PLTU yaitu kerusakan boiler tube akibat overheating. Adanya heat imbalance dan deviasi temperatur maupun kecepatan flue gas yang melewati jajaran heat exchanger menjadi penyebab local overheating. Selain itu, faktor ukuran partikel batubara yang tidak sesuai desain boiler dapat menyebabkan delayed combustion yang dapat berujung overheating. Penelitian ini bertujuan untuk mengetahui pengaruh ukuran partikel batubara terhadap karakteristik pembakaran (seperti distribusi temperatur, kecepatan, residence time ) pada PLTU Suralaya unit 7 tipe front-rear burner boiler. Penelitian ini menggunakan simulasi Computational Fluid Dynamics pada ANSYS Fluent dengan variasi ukuran partikel batubara 95 μm, 75 μm, 50 μm, dan 37,5 μm. Parameter input dan boundary condition yang digunakan berdasarkan data operasional saat kasus overheating terjadi pada pembebanan 400 MW. Hasil simulasi menunjukan bahwa mengecilnya ukuran partikel batubara dapat mengurangi pembakaran setelah FEGT ditandai dengan penurunan rata-rata temperatur pada FEGT pada rentang 1151,76 C hingga 1012,61 C, meningkatkan distribusi kecepatan ditandai dengan kenaikan rata-rata kecepatan pada FEGT pada rentang 9,979 m/s hingga 10,56 m/s. Pada area Secondary Superheater Row 32, terjadi penurunan distribusi temperatur dengan rentang temperatur maksimum 1288,42 C pada panjang tube 9,71 m hingga 1127,21 C pada panjang tube 10,79 m, serta adanya kenaikan kecepatan maksimum dengan rentang 11,91 m/s hingga 16,02 m/s. Ukuran partikel batubara yang lebih kecil dapat menurunkan Residence time batubara serta mengurangi kecenderungan terbentuknya slagging dan fouling pada jajaran heat exchanger.
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Until now, PLTU still dominates as the main electricity provider with an installed power generation capacity of 20,419 MW recorded at the end of 2022 by PT PLN. In boiler operations, there are disturbances that can reduce the performance of the PLTU, namely damage to the boiler tube due to overheating. The presence of heat imbalance and deviations in temperature and flue gas speed passing through the heat exchanger array are the causes of local overheating. In addition, the coal particle size factor that does not match the boiler design can cause delayed combustion which can lead to overheating. This study aims to determine the effect of coal particle size on combustion characteristics (such as temperature distribution, speed, residence time) at the Suralaya PLTU unit 7 front-rear burner boiler type. This study uses Computational Fluid Dynamics simulation on ANSYS Fluent with variations in coal particle size of 95 μm, 75 μm, 50 μm, and 37.5 μm. The input parameters and boundary conditions used are based on operational data when the overheating case occurs at a load of 400 MW. The simulation results show that reducing the size of coal particles can reduce combustion after FEGT marked by a decrease in the average temperature at FEGT in the range of 1151.76 C to 1012.61 C, increasing the velocity distribution marked by an increase in the average velocity at FEGT in the range of 9.979 m / s to 10.56 m / s. In the Secondary Superheater Row 32 area, there is a decrease in temperature distribution with a maximum temperature range of 1288.42 C at a tube length of 9.71 m to 1127.21 C at a tube length of 10.79 m, and an increase in maximum velocity with a range of 11.91 m / s to 16.02 m / s. Smaller coal particle sizes can reduce coal Residence time and reduce the tendency for slagging and fouling to form in the heat exchanger.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Boiler, Computational Fluid Dynamics, Overheating, Ukuran Partikel Batubara, Coal Particle Size |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general) T Technology > TJ Mechanical engineering and machinery > TJ324.5 Fuel systems |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | M Farid Nursalam |
| Date Deposited: | 12 Aug 2024 00:54 |
| Last Modified: | 27 Aug 2024 06:11 |
| URI: | http://repository.its.ac.id/id/eprint/114324 |
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