Studi Numerik Pengaruh Sudut Tilt Dan Yaw Sofa Terhadap Deviasi Rear Pass Temperature Boiler & NOx Content Pada Tangentially Fired Pulverized Coal Boiler 625 MW Pada Sudut Tilt Burner Negatif

Novianto, Desto Wahyu (2023) Studi Numerik Pengaruh Sudut Tilt Dan Yaw Sofa Terhadap Deviasi Rear Pass Temperature Boiler & NOx Content Pada Tangentially Fired Pulverized Coal Boiler 625 MW Pada Sudut Tilt Burner Negatif. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PLTU Suralaya 8 bertipe Tangentially Fired Pulverized Coal Boiler kapasitas 625 MW beroperasi dengan batubara LHV (low heating value) bernilai kalori 3900–4500 kcal/kg. Boiler pembangkit ini dilengkapi burner & SOFA (Separated Over Fire Air) yang berfungsi membentuk & mengontrol api pembakaran dalam boiler furnace. Kebocoran pipa boiler akibat ketidakseimbangan termal menjadi isu utama pembangkit ini, dimana terjadi deviasi temperatur ± 60oC pada area boiler rear pass karena ketidaksesuaian pengaturan sudut tilt burner. Sedangkan pengaturan sudut tilt dan yaw SOFA digunakan mengontrol terbentuknya emisi NOx. Berdasarkan Permen No. P.15/MENLHK/SETJEN/KUM.1/4/2019, nilai baku mutu emisi gas NOx pada 200 mg/Nm3, sedangkan pencapaian saat ini untuk baku mutu emisi gas NOx berada pada kisaran nilai 400 mg/Nm3.
Pengaturan parameter sudut tilt burner (0 o, -15 o, -30 o) serta variasi sudut tilt dan yaw SOFA (-15°, -8°, 0°, +8°, +15°) pada penelitian ini yang disimulasikan menggunakan CFD Ansys Fluent menghasilkan respon deviasi temperatur rear pass dan kadar NOx pada area outlet flue gas. Selanjutnya uji ANOVA dijalankan untuk mengetahui pengaruh perubahan sudut tilt burner dan tilt SOFA terhadap deviasi rear pass temperature boiler, sedangkan perubahan tilt burner signifikan berpengaruh terhadap NOx content. Hasil simulasi numerik kemudian dirumuskan dalam persamaan fungsi menggunakan ANN training hingga diperoleh nilai MSE terendah untuk fungsi deviasi rear pass temperature dan NOx content.
Hasil simulasi numerik yang kemudian dirumuskan dalam persamaan fungsi menggunakan ANN training diperoleh nilai MSE terendah untuk fungsi deviasi rear pass temperature senilai 0,0198 dan persamaan fungsi NOx content senilai 0,000673. Nilai deviasi temperatur terendah hasil simulasi numerik menggunakan ANSYS CFD Fluent didapat pada setting sudut tilt burner 0o dan tilt SOFA -15o senilai 35,42oC. NOx content yang dihasilkan pada setting sudut tilt burner -15o dan tilt SOFA -15oC senilai 122,71 mg/Nm3, lebih rendah 16,74% dibandingkan NOx content pada variasi sudut yang menghasilkan deviasi temperatur terendah.
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The 625 MW PLTU Suralaya 8 Tangentially Fired Pulverized Coal Boiler uses LHV (low heating value) coal with a calorific value of 3900-4500 kcal/kg. This plant boiler includes a burner and SOFA (Separated Over Fire Air), which work together to form and control the combustion fire in the boiler furnace. The main issue at this plant is boiler pipe leakage caused by thermal imbalance, with a temperature deviation of 60oC in the rear pass boiler area due to incompatibility of the tilt burner angle setting. Meanwhile, tilt angle settings and yaw SOFA are used to regulate NOx emissions. The quality standard value of NOx gas emissions is 200 mg/Nm3 according to Permen No.P.15/MENLHK/SETJEN/KUM.1/4/2019, while the current achievement for the quality standard of NOx gas emissions is in the 400 mg / Nm3 range.
The tilt burner angle parameter setting (0o, -15o, -30o) as well as variations in tilt angle and yaw SOFA (-15°, -8°, 0°, +8°, +15°) in this study simulated using CFD Ansys Fluent resulted in a response to rear pass temperature deviation and NOx levels in the flue gas outlet area. Furthermore, the ANOVA test was used to determine the effect of changes in tilt burner angle and tilt SOFA on the deviation of the boiler rear pass temperature, while changes in tilt burner significantly affected NOx gas emissions content. The numerical simulation results are then formulated in the function equation using ANN training until the minimum MSE value for the rear pass temperature deviation function and NOx content is obtained.
The numerical simulation results, which were then formulated in the function equation using ANN training, yielded the lowest MSE value for the rear pass temperature deviation function of 0.0198 and the NOx content function equation of 0.000673. The lowest temperature deviation value of numerical simulation results obtained using ANSYS CFD Fluent was 35.42oC at the tilt burner angle setting of 0o and tilt SOFA -15o. NOx gas emissions at the tilt burner angle setting of -15o and tilt SOFA -15oC worth 122.71 mg/Nm3 were 16.74% lower than NOx content at the angle variation that resulted in the lowest temperature deviation.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Burner SOFA, ANN, boiler rear pass temperature, emisi NOx, NOx gas emissions
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Desto Wahyu Novianto
Date Deposited:	17 Feb 2023 08:55
Last Modified:	17 Feb 2023 08:55
URI:	http://repository.its.ac.id/id/eprint/97560

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