Analisis Pengaruh Konfigurasi Burner Outage Dan Strategi Segregated Firing MRC-LRC Terhadap Performa Termal Boiler Tangentially Fired 660 MW Menggunakan CFD

Nabila, Feina Faizah (2026) Analisis Pengaruh Konfigurasi Burner Outage Dan Strategi Segregated Firing MRC-LRC Terhadap Performa Termal Boiler Tangentially Fired 660 MW Menggunakan CFD. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit listrik tenaga uap dengan boiler pulverized coal menggunakan dua jenis batubara. Dua jenis batu bara ini akan mengalami pencampuran (blending) di coal yard sebelum bahan bakar masuk ke boiler. Sehingga praktik inimemerlukan alat berat yang akan menambah waktu penanganan, dimana hal ini sulit menjamin konsistensi campuran. Adapun penelitian ini mengkaji strategi segregated firing, dimana Medium Rank Coal (MRC) dan Low Rank Coal (LRC) tidak dicampur melainkan dialokasikan pada burner yang berbeda. Tujuan penelitian adalah menganalisis pengaruh variasi konfigurasi burner dengan alokasi bahan bakar MRC dan LRC terhadap distribusi temperatur dan FEGT di dalam boiler tangentially fired 660 MW dan melakukan evaluasi apakah konfigurasi operasi eksisting merupakan kondisi yang paling optimal berdasarkan distribusi temperatur dan FEGT dalam rentang desain operasi. Simulasi dilakukan menggunakan metode Computational Fluid Dynamics pada boiler tangentially fired 660 MW dengan konfigurasi empat sudut dan enam tingkat burner. Empat scenario dibandingkan pada laju energi bahan bakar yang identic sama, meliputi kondisi eksisting berbahan bakar campuran (Case 1) dan tiga konfigurasi segregated firing dengan posisi burner outage yang berbeda (Case 2, Case 3, dan Case 4). Validasi model dilakukan terhadap data operasi aktual menggunakan parameter Furnace Exit Gas Temperature (FEGT). Hasil simulasi menunjukkan bahwa posisi burner outage dan strategi alokasi batubara berpengaruh signifikan terhadap distribusi temperatur, pola aliran dan karakteristik pembakaran, dimana hal ini memengaruhi pembagian beban termal di sepanjang furnace. Pada posisi burner outage yang sama, penerapan segregated firing pada Case 2 menghasilkan temperatur maksimum lokal yang lebih rendah dan distribusi temperatur yang lebih homogen pada Main Combustion Zone dibandingkan kondisi eksisting. Case 2 memiliki nilai FEGT yang paling mendekati 1.320 °C nilai rata-rata FEGT di lapangan, yaitu 1.304,11 °C. Konfigurasi ini juga mencapai keseragaman distribusi temperatur terbaik pada main combustion zone, sedangkan fraksi massa CO mendekati nol pada seluruh skenario yang menunjukkan pembakaran berlangsung tuntas. Dengan demikian, konfigurasi operasi eksisting belum optimal dan konfigurasi segregated firing dengan burner A tidak dioperasikan merupakan konfigurasi yang paling optimal karena unggul pada tiga kriteria evaluasi sekaligus. Dari hasil tersebut juga dapat dilihat bahwa peniadaan proses blending dapat meningkatkan performa termal boiler.
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Steam power plants with pulverized coal boilers use two types of coal. These two coal types are blended in the coal yard before the fuel enters the boiler. This practice requires heavy equipment, which increases handling time and makes the consistency of the blend difficult to guarantee. This study examines a segregated firing strategy, in which Medium Rank Coal (MRC) and Low Rank Coal (LRC) are not blended but instead allocated to different burners. The objectives of this study are to analyze the effect of varying burner configurations with MRC and LRC fuel allocation on the temperature distribution and FEGT within a 660 MW tangentially fired boiler, and to evaluate whether the existing operating configuration represents the most optimal condition based on the temperature distribution and FEGT within the operating design range. The simulation was carried out using the Computational Fluid Dynamics method on a 660 MW tangentially fired boiler with a four-corner, six-burner-level configuration. Four scenarios were compared at an identical fuel energy input rate, comprising the existing condition using blended fuel (Case 1) and three segregated firing configurations with different burner outage positions (Case 2, Case 3, and Case 4). Model validation was performed against actual operating data using the Furnace Exit Gas Temperature (FEGT) parameter. The simulation results indicate that the burner outage position and coal allocation strategy significantly affect temperature distribution, flow patterns, and combustion characteristics, thereby influencing the distribution of thermal load along the furnace. For the same burner outage position, the application of segregated firing in Case 2 resulted in a lower local maximum temperature and a more homogeneous temperature distribution in the Main Combustion Zone compared with the existing operating condition. Case 2 produced the FEGT value closest to 1,320 °C, which represents the average FEGT measured under field operating conditions, with a value of 1,304.11 °C. This configuration also achieved the most uniform temperature distribution in the Main Combustion Zone, while the CO mass fraction approached zero in all scenarios, indicating that the combustion process was essentially complete. Therefore, the existing operating configuration is not the most optimal, and the segregated firing configuration with burner A out of operation is identified as the most optimal configuration, as it performed best according to three evaluation criteria simultaneously. These results also indicate that eliminating the coal blending process has the potential to improve the thermal performance of the boiler.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Computational Fluid Dynamics; MRC; LRC; burner outage
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Feina Faizah Nabila
Date Deposited:	31 Jul 2026 19:48
Last Modified:	31 Jul 2026 19:48
URI:	http://repository.its.ac.id/id/eprint/142826

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