Mahawyahrta, I Nyoman Swar Raditya (2020) STUDY NUMERIK PENGARUH SUSUNAN TUBE STAGGERED DENGAN VARIASI DIAMETR TUBE TERHADAP PENGARUH LOKASI TERJADINYA SULFURIC ACID DEW POINT. Masters thesis, Institut Teknologi Sepuluh November.
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Abstract
Air preheater merupakan alat yang digunakan untuk mengoptimalkan kinerja boiler. Kerusakan atau kegagalan air preheater akibat korosi sering terjadi pada unit boiler, ini diakibatkan oleh gas SO3 dan SO2 (disebut juga SOx) didalam flue gas yang bersifat asam. pada kondisi temperatur flue gas mendekati atau sama dengan titik embun (acid dew point temperature ) gas SOx di dalam air heater akan membentuk asam sulfat /H₂SO. Fenomena ini dapat di tekanan dengan mengoptimalkan konfigurasi susunan dan dimensi tube.
Penelitian ini diawali pembuatan geometri model 2D dengan software GAMBIT 2.4.6. Untuk simulasi menggunakan software fluent 6.3.26, mode penyelesaian menggunakan Realizable k-ε Model, Enhanced Wall Treatment (Pressure gradient, Thermal Effect), persamaan energy, SIMPLE. Variasi yang digunakan adalah variasi susunan tube (Aligned dan staggered), variasi diameter tube (D-25, D-40 dan D-51) dan variasi Pembebanan (100% dan 50%). Diharapkan mendapatakan desai air preheater dengan jumlah row kritis terjadinya sulfuric acid dew point temperatur paling sedikit.
Berdasarkan hasil simulasi, diketahui bahwa dengan mengubah susunan tube menjadi susunan staggred perpindahan panas menjadi libih baik diikuti dengan jumlah row kritis lebih sedikit. Begitu juga dengan menambah dimater tube didapatkan perpindahan panas yang lebih bagus dengan jumlah row kritis yang lebih sedikit. Pada variasi pembebanan, perpindahan panas pada pembebanan 100% lebih baik dari pada pembebanan 50%. Namun jumlah row kritis pada pembebanan 100% lebih banyak dibandingkan dengan pembebanan 50%.
Kata Kunci : Air preheater, Acid Dew Point Temperature, Ansys Fluent, Aligned , Staggered
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The air preheater is a tool used to optimize boiler performance. Damage or failure of the air preheater due to corrosion often occurs in boiler units, this is caused by SO3 and SO2 (SOx) gases in the acidic flue gas. When the flue gas temperature is close to or equal to acid dew point temperature, SOx gas in the air heater will form sulfuric acid / H₂SO4. This phenomenon can be suppressed by optimizing the configuration of the tube arrangement and dimensions.
This research begins with making a 2D geometry model with GAMBIT 2.4.6 software. For simulations using fluent 6.3.26 software, turbulence mode using Realizable k-ε Model, Enhanced Wall Treatment (Pressure gradient, Thermal Effect), energy equation, SIMPLE. The variations used are variations of tube arrangement (Aligned and staggered), variations in tube diameter (D-25, D-40 and D-51) and variations of loading (100% and 50%). It is expected to get a preheater water design with the number of critical rows where the sulfuric acid dew point temperature is the least.
Based on the simulation results, it is known that by changing the tube arrangement into a staggred arrangement, the heat transfer becomes better followed by a smaller number of critical rows. Likewise, by enlarging the dimater tube, the heat transfer is better with the number of critical rows less. At various loads, heat transfer at 100% loading is better than at 50% load. However, the number of critical rows at 100% loading was higher than at 50% loading or at 100% load, the tubes experienced more corrosion.
Keywords : Water preheater, Acid Dew Point Temperature, Ansys Fluent, Aligned, Staggered
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Air preheater, Acid Dew Point Temperature, Ansys Fluent, Aligned, Staggered, temperatur korosi |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ935 Pipe--Fluid dynamics. Tubes--Fluid dynamics |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | I Nyoman Swar Raditya Mahawyahrta |
| Date Deposited: | 25 Aug 2020 04:23 |
| Last Modified: | 28 Dec 2023 13:28 |
| URI: | http://repository.its.ac.id/id/eprint/81052 |
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