Studi Numerik Karakteristik Aliran Dan Perpindahan Panas Flue Gas-Primary Air Pada Rotary Regenerative Air Preheater

Kusuma, Dian Mustikaning (2015) Studi Numerik Karakteristik Aliran Dan Perpindahan Panas Flue Gas-Primary Air Pada Rotary Regenerative Air Preheater. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaaan batubara campuran low rank yang nilai kalorinya lebih rendah dan kadar moisture lebih tinggi dari design awal boiler PLTU Paiton 1-2 menyebabkan meningkatkan kebutuhan temperatur primary air untuk proses internal drying pada pulvurizer. Salah satu cara meningkatkan temperatur primary air adalah menambah elemen heater pada intermediate layer ljungstrom rotary regenerative air pre heater. Penambahan elemen ini dapat meningkatkan perpindahan panas dan performa dari air preheater, namun juga berefek pada meningkatnya pressure drop pada primary air outlet dan meningkatnya resiko sulfur dew point temperature corrosion akibat menurunnya metal temperature pada flue gas outlet. Oleh karena itu studi numerik perlu dilakukan untuk mengetahui karakteristik aliran dan perilaku perpindahan panas pada air preheater. Penelitian ini merupakan simulasi numerik 3D dengan bantuan software Fluent 6.3.26. Pemodelan menggunakan solver k-epsilon standar dengan mengaplikasikan persamaan massa, energy dan momentum untuk mengetahui pengaruh modifikasi dengan variasi profil DU (Double Undulated) atau NF6 (Notch Flat 6), dengan pendekatan poros media. MRF (Moving Reference Frame) diaplikasikan untuk mengetahui efek variasi kecepatan rotasi. Dari hasi pengolahan data post processing dan analisa secara kualitatif dan kuantitatif, didapatkan nilai dari masing masing konfigurasi DU-DU-NF6 dan DU-NF6-NF6 adalah 7533.37 pascal dan 7619.62 pascal untuk primary air outlet pressure, serta 296.02 ○C dan 296.10 ○C untuk temperatur flue gas outlet, sehingga kedua jenis konfigurasi ini dapat digunakan. Konfigurasi yang paling optimal adalah DU-DU-NF6 dengan kecepatan rotasi 3 rpm, yang memberikan nilai effectiveness sebesar 70%. ======================================================================================================== Low rank coal which had lower calories and higher moisture content than design requirement, had been used as mix coal feeding in Paiton 1-2 steam power plant’s boiler. It increased primary air temperature demand for internal drying process in pulvurizer. One of strategies to improve primary air temperature was by adding element heaters in intermediate layer ofLjungstorm rotary air preheater. This modification would enhance heat transfer and performance of airpreheater, meanwhile result to higher pressure drop at primary air outlet and risk of acid dew point temperature corrosion due to lower metal temperature at flue gas outlet. Therefore flow characteristic and heat transfer behavior in airpreheater were necessary to be investigated for modification feasiability. This study was 3D numerical simulation using Fluent 6.3.26. The Modeling used k-epsilon turbulent viscous standard and applied mass, energy and momentum equation to investigate effect of modification using matrix profile variation DU (Double Undulated) and NF6 (Notch Flat 6), which were approached as porous media. Moving Reference Frame (MRF) was applied to incorporate the effect of rotational speed. The post processing results had been analyzed qualitatively and quantitatively. The results for each DU-DU-NF6 and DU-NF6-NF6 configuration were 7533.37 pascal and 7619.62 pascal for primary air outlet pressure, also 296.02 ○C and 296.10 ○C for flue gas outlet temperature. Therefore both configurations could be applied. The optimum configuration was DU-DU-NF6 with 3 rpm speed, which resulted to 70% effectiveness

Item Type: Thesis (Undergraduate)
Additional Information: RTM 621.402 5 Kus s
Uncontrolled Keywords: Ljungstrom rotary air preheater, heating element, poros media, moving reference frame
Subjects: T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment
Divisions: Faculty of Industrial Technology > Mechanical Engineering > (S1) Undergraduate Theses
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 22 Mar 2018 07:40
Last Modified: 24 Aug 2018 03:34
URI: http://repository.its.ac.id/id/eprint/51613

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