Studi Numerik Pengaruh Ukuran Partikel Bed Terhadap Abrasi Cyclone Pada Circulating Fluidized Bed (CFB) Boiler PLTU Tenayan Dengan Software CPFD

Simanungkalit, Onward (2021) Studi Numerik Pengaruh Ukuran Partikel Bed Terhadap Abrasi Cyclone Pada Circulating Fluidized Bed (CFB) Boiler PLTU Tenayan Dengan Software CPFD. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Circulating fluidized bed (CFB) boiler memanfaatkan proses fluidisasi dalam pembakaran bahan bakar. Proses fluidisasi tersebut menggunakan material berupa partikel pasir (bed materials). Tujuannya agar temperatur dari furnace terdisribusi secara merata. CFB boiler memiliki salah satu bagian yang disebut dengan cyclone separator yang berfungsi untuk memisahkan partikel pasir dengan fluida (flue gas). Penelitian bertujuan mengetahui pengaruh ukuran partikel bed terhadap abrasi cyclone CFB boiler PLTU Tenayan. Metode yang dilakukan menggunakan software Computational Particle-Fluid Dynamics (CPFD) Barracuda Virtual Reactor 17.4. Geometri dibuat menggunakan SOLIDWORK 2020 dan diekspor dalam format *.stl. Variasi partikel pertama menggunakan ukuran partikel pertama dengan SMD (Sauter Mean Diameter) sebesar 57 μm, diameter minimum 2 μm, dan diameter maksimum 300 μm. Variasi partikel kedua menggunakan ukuran partikel dengan SMD 114 μm, diameter minimum 4 μm, dan diameter maksimum 600 μm. Simulasi menggunakan variasi mass flow udara sebesar 80%, 100%, 110%, dan 120% dari mass flow udara normal (69,43 kg/s). Model drag yang digunakan adalah Wen Yu, dan model turbulensi Large Eddy Simulation. Penurunan tekanan tertinggi berada pada standpipe. Kecepatan partikel berbanding lurus dengan kecepatan fluida, hal tersebut disebabkan oleh gaya drag pada partikel. Fraksi volume partikel meningkat seiring dengan meningkatnya mass flow udara dan ukuran partikel. Efisiensi pemisah cyclone terbesar dihasilkan oleh partikel kedua dengan mass flow udara 83,3 kg/s sebesar 96,44 % sedangkan efisiensi terkecil dihasilkan oleh partikel pertama dengan mass flow udara 55,5 kg/s sebesar 85,05 %. Efisiensi akan meningkat jika ukuran dan mass flow udara ditingkatkan. Intensitas abrasi paling parah terletak pada bagian cyclone barrel (silinder). Semakin besar ukuran partikel maka semakin besar abrasi yang dihasilkan. Semakin besar mass flow udara yang dialirkan, maka semakin besar tingkat abrasi pada cyclone. ============================================================ ======================================= Circulating fluidized bed (CFB) boiler utilizes fluidization process in fuel combustion. The fluidization process uses materials in the form of sand particles (bed materials). The goal is for the temperature of the furnace to be distributed evenly. CFB boiler has one part called cyclone separator that serves to separate sand particles with fluid (flue gas). The research aims to determine the effect of bed particle size on the abrasion of cyclone CFB boiler PLTU Tenayan. The method is done using Computational Particle-Fluid Dynamics (CPFD) Software Barracuda Virtual Reactor 17.4. Geometry is created using SOLIDWORK 2020 and exported in *.stl format. The first particle variation uses the first particle size with SMD (Sauter Mean Diameter) of 57 μm, a minimum diameter of 2 μm, and a maximum diameter of 300 μm. The second particle variation uses a particle size with SMD 114 μm, a minimum diameter of 4 μm, and a maximum diameter of 600 μm. The simulation uses a variety of air mass flow by 80%, 100%, 110%, and 120% of normal air mass flow (69.43 kg/s). The drag model used is Wen Yu, and the Large Eddy Simulation turbulence model. The highest pressure drop is on the standpipe. The particle speed is directly proportional to the speed of the fluid, which is due to the drag force of the particle. Particle volume fraction increases as air mass flow increases and particle size increases. The largest cyclone separator efficiency is produced by the second particle with an air mass flow of 83.3 kg/s of 96.44% while the smallest efficiency is produced by the first particle with an air mass flow of 55.5 kg/s of 85.05%. Efficiency will increase if the size and mass flow of air is increased. The most severe abrasion intensity lies in the cyclone barrel (cylinder) section. The larger the particle size, the greater the abrasion produced. The greater the mass flow of air flow, the greater the level of abrasion in cyclones.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: CFB boiler, cyclone, fluidisasi, abrasi, CPFD, CFB boiler, cyclone, fluidization, abrasion, CPFD
Subjects: T Technology > T Technology (General) > T57.62 Simulation
T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Onward Simanungkalit
Date Deposited: 11 Aug 2021 07:37
Last Modified: 11 Aug 2021 07:37
URI: https://repository.its.ac.id/id/eprint/85512

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