Nugroho, Agung (2020) Studi Numerik Heat Transfer Dan Tegangan-Regangan Lance Tube Sootblower Dua Sambungan Atau Tiga Sambungan Unit Pembangkitan Suralaya 600 MW. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Keandalan sisi ketebalan, grade material, dan kekuatan dari overhung lance tube sootblower sangat penting terhadap kebersihan tube banks boiler 600 MW. Pengoperasian dan pemeliharaan yang tepat sangat mempengaruhi keandalan tersebut. Tujuan penenlitian ini adalah mengetahui karakteristik heat transfer, thermal stress karena temperatur gas buang tinggi, dan overhung menchanical stress pada pipa lance tube sootblower. Saat beroperasi, kemungkinan terjadi defleksi permanen yang menyatakan terjadinya deformasi plastis dan fenomena ini harus dihindari.Penelitian ini dimulai dari pembuatan geometri model 3D, meshing, dan menentukan kondisi batas dengan software ANSYS 16.2 SPACE CLAIM. Software ANSYS fluent 16.2, mode penyelesaian menggunakan k-epsilon standard wall function, persamaan energi, SIMPLE. Kondisi batas yang digunakan adalah heat flux konstan yang terserap oleh lance tube, kemudian memvariasikan densitas, kecepatan, kapasitas panas uap sehingga didapatkan distribusi temperatur dan tekanan terhadap dinding dalam lance tube . Kemudian dilakukan pemodelan numerik berbasis metode elemen hingga terhadap pertama, model tiga macam ketebalan (5mm, 7mm, dan 11mm) dan kedua, untuk model lance tube dengan nozzle-nya dimana beban model adalah beban mekanis, thermal, pressure akibat steam jet. Ketiga adalah lance tube dengan enam konfigurasi ketebalan yang hanya dianalisa secara statik. Makin tinggi densitas steam, makin tinggi pressure inlet steam lance tube dan makin tinggi stress akibat pressure pada nozzle lance tube. Stress terkecil didapatkan pada 3 sambungan lance tube, yaitu tebal 5 mm (sepanjang 3.2m), tebal 7 mm (sepanjang 3m), tebal 11 mm (sepanjang 3m). Dengan mahal-nya harga lance tube OEM, maka sebaiknya dipilih untuk lance tube dengan 3 sambungan hasil analisa untuk mendapatkan keandalan lance tube dimana equivalent stress yang terjadi tidak boleh lebih dari 133 MPa.
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Reliability on thickness and grade material side, then overhung mechanical strength are very important for cleanliness of tube bank boiler 600 MW. Proper Operation and mainetanance very effected toward sootblower system reliability. Objectives of this research are knowing heat transfer characteristics of lance tube, thermal stress due to high temperature flue gas, and lance tube overhung mechanical stress onto sootblower lance inner wall. During sootblowing there is possibility permanent deflection happerned that confirm plastic deformation and this fenomena should be avoided This research start with 3D geometry modelling, meshing and determine boundary condition with software ANSYS 16.2 SPACE CLAIM. This software use k-epsilon standard wall function, energy equation, SIMPLE. Boundary conditions that is set up are constant Heat flux that is absorbed by lance tube inner wall. Then varying steam density, heat capacity and velocity. In order to achieve temperature and pressure distribution. Then conduct finite element modeling to-ward, the first, three kinds of thickness (5mm, 7mm, dan 11mm), the second is lance tube with nozzle model where loads are overhung mechanical stress, thermal stress, , and pressure stress due to steam jet. The third, lance tube with six thiekness configuration that is analyzed statically The higher steam density, the higher lance steam pressure inlet and the higher the stress due to pressure on lance tube nozzle. Smallest stress is obtained for 3 joint lance tube, that is 5mm thickness (3.2m), 7mm thickness (3m), 11mm thickness (3m). The more expensive OEM lance tube, it is better to choose lance tube with 3 joints that is got from analysis to achieve lance tube reliability that the equivalent stress suffered is no more than 133 MPa.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 621.194 Nug s-1 |
| Uncontrolled Keywords: | mechanical stress, thermal stress, pressure stress, lance tube sootblower, CFD modeling, finite element method |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ357 Pressure regulators |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | AGUNG NUGROHO |
| Date Deposited: | 05 Mar 2025 05:43 |
| Last Modified: | 05 Mar 2025 05:43 |
| URI: | http://repository.its.ac.id/id/eprint/75325 |
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