Purnomo, Fajar (2020) Studi Numerik Karakterteristik Pembakaran Batubara Metode In-Furnace Blending Dengan Variasi Pengumpan Jenis Batubara Pada Sudut Tilting Burner -10° Di Boiler PLTU Suralaya 8. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
PLTU Suralaya 8 merupakan pembangkit listrik yang didesain menggunakan bahan bakar batubara kalori rendah (low rank coal) dengan tipe tangentially fired pulverized coal boiler. Pembakaran pada boiler jenis ini lebih sempurna karena aliran di furnace membentuk fire ball. Kesempurnaan proses pembakaran juga dipengaruhi oleh material properties dari batubara. Pada kondisi beban penuh (MCR), semua peralatan di area boiler beroperasi pada kondisi maximum load sehingga akan menurunkan tingkat kehandalan sistem pembangkit. Untuk meningkatkan kehandalan boiler maka dilakukan in-furnace blending batubara LRC dengan MRC. Maka dari itu diperlukan penelitian mengenai pola pengumpanan batubara LRC dan MRC pada elevasi burner yang tepat agar menghasilkan pembakaran yang lebih sempurna, distribusi temperatur yang merata dan nilai ekonomis terbaik dari pengoperasian pembangkit. Studi numerik ini menggunakan metode Computational Fluid Dynamics (CFD). Pembuatan geometri boiler menggunakan software Gambit dan simulasi numerik menggunakan software ANSYS Fluent. Simulasi menggunakan model turbulensi k-ε standard. Substitusi LRC dengan MRC sesuai perhitungan ekonomis dilakukan pada 1 elevasi burner dengan sudut tilting burner -10°. Boundary condition primary air nozzle, secondary air nozzle, CCOFA, SOFA, dan coal injection menggunakan velocity inlet. Heat exchanger diasumsikan sebagai porous medium dengan heat generation sedangkan waterwall-tube sebagai wall dengan heat flux. Substitusi LRC ke MRC paling ekonomis didapatkan pada pola pengumpanan 1 elevasi burner. Temperatur FEGT terendah pada kasus 2,3, dan 4 sedangkan overheating setelah melewati FEGT terjadi pada kasus 4,5. Proses pembakaran pada kasus 3 menghasilkan pembakaran paling sempurna dengan excess air (O2 lebih) terkecil yaitu 3,9 % dan emisi CO2 terbesar 18,08 %.
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Suralaya 8 Coal Fired Power Plant is a power plant designed to use low calorie coal fuel (LRC) with tangentially fired pulverized coal boiler. Combustion in this type of boiler is more perfect because of flow in the furnace forms a fire ball. Proper combustion process is also influenced by the material properties of coal. At maximum continuous rate (MCR), all equipment in the boiler area operates at maximum load conditions so that it will reduce the level of reliability of the power plant. To increase boiler reliability, LRC blend with MRC. Therefore, research is needed regarding the pattern of LRC and MRC coal injection at the right burner elevation to produce a more perfect combustion, even temperature distribution and the best economic value of the operation of the plant. Numerical study uses the Computational Fluid Dynamics (CFD) method. Making boiler geometry using Gambit software and numerical simulation using Ansys Fluent software. The simulation uses the k-ε standard turbulence model. LRC substitution with MRC according to economical calculations is performed at 1 burner elevation with a tilting burner angle of -10 °. Boundary condition of primary air nozzle, secondary air nozzle, CCOFA, SOFA, and coal injection using velocity inlet. Heat exchangers are assumed to be porous medium with heat generation while waterwall-tubes as walls with heat flux.(O2) The most economical LRC to MRC substitution was obtained in injection burner elevation. The lowest FEGT temperature was in cases 2,3 and 4, while overheating after passing the FEGT occurred in 4,5 cases. The combustion process in case 3 produced the most complete combustion with the smallest excess of water (O2) at 3,9% and the largest CO2 emission at 18,08%.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 621.433 2 Pur s-1 2020 |
| Uncontrolled Keywords: | Combustion, Coal Blending, Tilting Burner, CFD |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Fajar Purnomo |
| Date Deposited: | 06 Mar 2025 06:43 |
| Last Modified: | 06 Mar 2025 06:43 |
| URI: | http://repository.its.ac.id/id/eprint/75358 |
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