Baihaqi, Riski (2025) Analisa Numerik Pengaruh Temperatur Dan Equivalent Stress Terhadap Rupture Time Material Superheater Header Pada Kondisi Level Injeksi Biomassa Yang Berbeda Pulverizer Coal Boiler. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pembangkit Listrik Tenaga Uap (PLTU) berencana melakukan efisiensi pada biaya dan emisi, dilakukan co-firing dengan biomassa (sawdust) berkalori lebih rendah. Meskipun ekonomis, perubahan ini berisiko menimbulkan masalah operasi dan pemeliharaan karena bahan bakar di bawah spesifikasi desain. Optimalisasi dilakukan melalui pengaturan elevasi injeksi biomassa, tilting burner, dan SOFA. Studi ini menganalisis pengaruh ketiga parameter tersebut terhadap distribusi temperatur dan kecepatan serta dampaknya pada Rupture time sambungan superheater header. Simulasi dilakukan dengan melakukan variasi injeksi 10% biomassa pada elevasi A, B, C yang paling rendah akan di variasikan sudut tilting burner -15°, 0°, dan +15°. Dari hasil tilting burner yang paling rendah akan dilakukan variasi SOFA 0%, 10%, dan 20%. Jumlah biomassa, batubara, dan udara pembakaran untuk setiap variasi sudut tilting burner adalah sama. Didapatkan dari hasil simulasi menunjukkan bahwa efek dari superheater header dimana semakin atas elevasi (a-b-c) injeksi 10% sawdust maka pembakaran akan bergeser keatas. Begitupun semakin keatas sudut tilting burner (-15°, 0°, +15°) maka semakin ke atas juga posisi fireball dan pembakaran. Dan semakin tinggi injeksi SOFA (0%, 10%, 20%) maka semakin merata pembakaran lanjut mulai SOFA hingga oulet reheater. Temperatur tinggi pada heating part karena pembakaran lanjut di area heating part mengakibat overheating. Dengan adanya hoop stress karena steam dan oveheating akibat meningkatnya temperatur pada sambungan tube maka dapat menurun Rupture time karena ketika posisi fireball dan pembakaran bergeser keatas, panas yang diserap oleh superheater platen dapat memicu fenomena overheating yang menyebabkan creep. Didapatkan kondisi ketahanan (Rupture time) material superheater header dan tube platen terendah pada kasus injeksi elevasi A dengan Tilt +15° dan SOFA 10%. Dengan selisih Rupture time 62,93 % dibandingkan kondisi 100% batubara. Namun dengan tilt -15° dan SOFA 10% merupakan kondisi terbaik dengan rupture time lebih tinggi 3,09% dari pada kondisi 100% batubara.
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Steam power plants are planning cost and emissions efficiencies by co-firing with lower-calorie biomass (sawdust). While economical, this change risks operation and maintenance issues as the fuel is below design specifications. Optimization was done by adjusting the biomass injection elevation, burner tilting, and SOFA. This study analyzes the effect of these three parameters on the temperature and velocity distributions and their impact on the Rupture time of the superheater header connection. The simulation was conducted by varying the injection of 10% biomass at the lowest elevation A, B, C and then varying the burner tilting angle of -15°, 0°, and +15°. From the results of the lowest tilting burner, variations of 0%, 10%, and 20% SOFA will be carried out. The amount of biomass, coal, and combustion air for each burner tilting angle variation is the same. The simulation results show that the effect of the superheater header where the higher the elevation (a-b-c) of 10% sawdust injection, the combustion will shift upward. Likewise, the higher the burner tilting angle (-15°, 0°, +15°), the higher the fireball and combustion position. And the higher the SOFA injection (0%, 10%, 20%), the more evenly the combustion continues from SOFA to the reheater oulet. High temperatures in the heating part due to continued combustion in the heating part area result in overheating. In the presence of hoop stress due to steam and overheating due to the increased. With hoop stress due to steam and overheating due to increasing temperature at the tube connection, the Rupture time can decrease because when the position of the fireball and combustion shifts upward, the heat absorbed by the superheater platen can trigger an overheating phenomenon that causes creep. The lowest rupture time of superheater header and tube platen material was obtained in the case of injection elevation A with Tilt +15° and SOFA 10%. Rupture time difference is 62.93% compared to 100% coal condition. However, tilt -15° and SOFA 10% is the best condition with a higher rupture time of 3.09% than the 100% coal condition.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers 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 > TJ265.E23 Thermodynamics. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Riski Baihaqi |
| Date Deposited: | 01 Aug 2025 02:14 |
| Last Modified: | 01 Aug 2025 02:14 |
| URI: | http://repository.its.ac.id/id/eprint/125509 |
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