Studi Numerik Pengaruh Dimensi Economizer Hopper Pada Boiler Terhadap Flue gas Dan Fly Ash

Amrulloh, Mohammad Mufid (2023) Studi Numerik Pengaruh Dimensi Economizer Hopper Pada Boiler Terhadap Flue gas Dan Fly Ash. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Fly ash pada flue gas dapat menyumbat dan menyebabkan korosi pada air preheater atau pemanas udara. Air preheater pada PLTU Tanjung Awar-awar harus diganti setiap tahun karena dampak dari fly ash. Maka dari itu saluran flue gas pada boiler outlet perlu didesain agar dapat menampung fly ash dengan menggunakan hopper. Fungsi dari hopper yaitu untuk memisahkan aliran flue gas dari fly ash dengan cara menampung fly ash. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh dimensi hopper terhadap fly ash dan flue gas serta untuk mengetahui dimensi hopper yang paling baik. Penelitian dilakukan menggunakan metode CFD Ansys Fluent. Pada penelitian ini variasi yang digunakan yaitu tanpa hopper dan hopper dengan kedalaman 3 m, 4 m, dan 5 m. Semakin dalam hopper maka kecepatan flue gas pada outlet dan nilai heat transfer coefficient menuju air preheater semakin meningkat. Namun perubahan kecepatan flue gas pada outlet tanpa hopper dan dengan hopper sangat kecil sehingga tidak terlalu berdampak pada air preheater. Semakin dalam kedalaman hopper maka pressure drop flue gas dan reynolds number semakin meningkat. Bertambahnya kedalaman hopper mengakibatkan temperatur outlet dan nilai heat transfer menuju air preheater semakin turun. Semakin dalam hopper maka persentase jumlah fly ash dan massa fly ash yang lolos menuju air preheater semakin menurun serta massa fly ash yang tertampung di dalam hopper semakin banyak. Dimensi hopper 5 m merupakan dimensi terbaik dalam mengurangi fly ash lolos dengan hanya 18.53 % fly ash parcel yang lolos, 86.75 kg fly ash terjebak pada hopper, dan hanya 0.9 kg massa fly ash yang lolos.
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Fly ash in flue gas can cause clogging and corrosion in the air preheater. At PLTU Tanjung Awar-awar, the air preheater needs to be replaced every year due to the impact of fly ash. To address this issue, a hopper is designed in the flue gas channel at the boiler outlet to collect fly ash, effectively separating it from the flue gas flow. The purpose of this research is to investigate the effect of hopper dimensions on fly ash and flue gas, as well as to determine the most optimal hopper dimension. The research is conducted using the CFD (Computational Fluid Dynamics) method with Ansys Fluent software. The variations tested in this study include scenarios with no hopper and hoppers with depths of 3 m, 4 m, and 5 m. Deeper hoppers result in increased flue gas velocity at the outlet and higher heat transfer coefficients towards the air preheater. However, the change in flue gas velocity at the outlet, both with and without the hopper, is minimal and has little impact on the air preheater. As the hopper depth increases, the pressure drop of flue gas and Reynolds number also rise. Additionally, increasing the hopper depth leads to a decrease in outlet temperature and heat transfer values towards the air preheater. Moreover, deeper hoppers significantly reduce the percentage of fly ash and fly ash mass passing through to the air preheater, while increasing the amount of fly ash mass accumulated inside the hopper. The 5 m hopper dimension is found to be the most effective in reducing fly ash passage, with only 18.53% of the fly ash parcel passing through, while 86.75 kg of fly ash is trapped in the hopper, and only 0.9 kg of fly ash mass escaping.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Flue Gas, Fly Ash, Hopper, Gas Buang, Abu Terbang, Hopper.
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction 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 > TJ762.E93 Exhaust systems
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Mufid Amrulloh
Date Deposited:	03 Aug 2023 14:47
Last Modified:	03 Aug 2023 14:47
URI:	http://repository.its.ac.id/id/eprint/100685

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