Abisha, Samuel (2026) Studi Numerik Pengaruh Modifikasi Geometri Bag Filter Dan Penambahan Deflektor Terhadap Distribusi Kecepatan Flue Gas Dan Kinerja Filtrasi Pada Pulse Jet BAghouse Filter PLTU 2 x 7 MW. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Peningkatan kapasitas Pembangkit Listrik Tenaga Uap (PLTU) berbahan bakar batubara di Indonesia menyebabkan meningkatnya emisi debu atau partikulat, sehingga diperlukan alat pengendali pencemaran udara yang bekerja secara optimal pada PLTU salah satunya pulse jet baghouse filter. Seiring berjalannya waktu dan meningkatnya skala pruduksi listrik, tidak terlepas dari permasalahan kehandalan baghouse filter. salah satunya adalah kantong filter atau bag filter mengalami abrasi. Pada PLTU 2 × 7 MW, permasalahan yang terjadi adalah umur pakai kantong filter yang relatif singkat akibat kecepatan aliran (Interstitial velocity) flue gas diantara kantong filter yang terlalu tinggi dan tidak seragam dimana hal ini menimbulkan abrasi pada permukaan bag filter dan meningkatkan biaya perawatan. Penelitian ini bertujuan untuk mengetahui pengaruh modifikasi geometri bag filter dan penambahan deflector terhadap nilai Interstitial velocity pada sela-sela antar bag filter yang diikuti dengan
keseragaman aliran flue gas dan kinerja filtrasi baghouse filter. Penelitian ini menggunakan metode simulasi numerik Computational Fluid Dynamics (CFD) dengan bantuan perangkat
lunak ANSYS Fluent. Pemodelan aliran melibatkan dua fasa, yaitu flue gas sebagai fasa kontinu dan fly ash sebagai fasa diskrit yang dimodelkan menggunakan Discrete Phase Model (DPM). Objek yang digunakan berupa baghouse pulse jet filter PLTU 2 × 7 MW dengan beberapa modifikasi geometri berupa jarak antar bag filter sebesar, 52 mm, 63 mm, dan panjang bag filter sebesar 5 m, 6 m dengan penambahan deflector di bagian hopper pada setiap variasi. Pada simulasi ini, kondisi batas untuk inlet diatur sebagai velocity inlet, untuk outlet diatur sebagai pressure outlet, dan porous- jump digunakan untuk mensimulasikan kain filter Polyhenylene Sulphide yang akan dilalui flue gas menuju outlet atas baghouse filter. Proses penggambaran geometry baghouse filter menggunakan perangkat lunak Autodesk Inventor Professional 2024 dan simulasi numerik dilakukan menggunakan Ansys fluent. Setelah melalui proses simulasi Baghouse filter, menghasilkan modifikasi yang baik yaitu modifikasi 2 memberikan hasil σ sebesar 7,12% (line 1x), 5,02% (line 3x), dan 9,11% (line 1z), preasure drop sebesar 204.35 Pa yang masih di batas aman dari model lain dan modifikasi 2 memiliki efisiensi sebesar 99,32%, dan menjadi nilai efisiensi tertinggi di antara ketiga geometri.
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The increasing capacity of coal-fired steam power plants (PLTU) in Indonesia has led to a rise in dust or particulate emissions, requiring an air pollution control device that operates optimally in these plants, one of which is thepulse jet baghouse filter. Over time, as the scale of electricity production increases, issues related to baghouse filter reliability inevitably arise, one of which is abrasion of the filter bags. In the 2 × 7 MW PLTU, the problem encountered is the relatively short service life of the filter bags due to excessively high and non-uniform interstitial velocity of the flue gas flow between the filter bags, which causes abrasion on the bag filter surface and increases maintenance costs. This study aims to determine the effect of bag filter geometry modification and the addition of a deflector on the interstitial velocity value in the gaps between bag filters, followed by the uniformity of flue gas flow and the filtration performance of the baghouse filter. This study employs the Computational Fluid Dynamics (CFD) numerical simulation method using ANSYS Fluent software. The flow modeling involves two phases: flue gas as the continuous phase and fly ash as the discrete phase, modeled using the Discrete Phase Model (DPM). The
object used is a pulse jet baghouse filter from a 2 × 7 MW PLTU, with several geometry modifications including bag filter spacing of 52 mm and 63 mm, and bag filter lengths of
5 m and 6 m, with the addition of a deflector in the hopper section for each variation. In this simulation, the boundary conditions were set as velocity inlet for the inlet, pressure outlet for the outlet, and a porous-jump was used to simulate the Polyphenylene Sulfide filter fabric through which the flue gas passes toward the upper outlet of the baghouse filter. The baghouse filter geometry was modeled using Autodesk Inventor Professional 2024 software, and the numerical simulation was performed using ANSYS Fluent.
Following the baghouse filter simulation process, Modification 2 produced the best results, with a σ value of 7.12% (line 1x), 5.02% (line 3x), and 9.11% (line 1z), a pressure drop of 204.35 Pa which remains within the safe limit compared to the other models, and an efficiency of 99.32%, the highest efficiency value among the three geometries.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Baghouse filter, Interstitial Velocity, Computational Fluid Dynamics, Baghouse filter, Interstitial Velocity, Computational Fluid Dynamics |
| Subjects: | Q Science > QC Physics > QC151 Fluid dynamics T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design 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 Vocational > Mechanical Industrial Engineering (D4) |
| Depositing User: | samuel abisha |
| Date Deposited: | 04 Aug 2026 07:03 |
| Last Modified: | 04 Aug 2026 07:03 |
| URI: | http://repository.its.ac.id/id/eprint/143271 |
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