Pratama, Yudha Satria Aji (2024) Pengaruh Komposisi Agregat Pada Refractory Bricks Magnesia-Spinel Terhadap Packing Density Menggunakan Discrete Element Method (DEM) Dengan Software Ansys Rocky. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Bata tahan api merupakan komponen krusial dalam industri yang melibatkan suhu tinggi, yang berfungsi untuk melindungi dinding reaktor/tungku dari suhu ekstrem. Salah satu tantangan utama dalam produksi bata tahan api adalah mencapai kepadatan packing yang tinggi dan meminimalkan porositas pada tahap pembentukan greenbody. Greenbody dengan densitas rendah dan porositas tinggi dapat menyebabkan penurunan kualitas produk akhir refraktori. Penelitian ini bertujuan untuk menganalisis pengaruh distribusi ukuran partikel ”q” dalam perhitungan Modified Andreassen Packing Model yang digunakan untuk menentukan komposisi agregat, dengan memvariasikan nilai q (distribution modulus) untuk mencapai Packing density tertinggi. Metodologi penelitian melibatkan simulasi pembuatan greenbody dalam proses powder compaction menggunakan Discrete Element Method dengan software Rocky DEM. Simulasi dilakukan dengan memvariasikan nilai modulus distribusi ”q” pada teori Modified Andreassen Packing Model dari 0,21 hingga 0,30 pada campuran 82% partikel MgO dan 18% partikel MgAl_2 O_4. Kondisi kuat tekan dan variasi agregat pada material MgO dan MgAl_2 O_4 yang digunakan dalam penelitian ini disesuaikan dengan kondisi yang digunakan dalam industri pembuatan Refractory Bricks Magnesia-Spinel pada PT.Benteng Api Technic. Hasil simulasi menunjukkan bahwa nilai q terbaik untuk mencapai Packing density tertinggi adalah 0.28, dengan nilai 74.97%. Analisis menunjukkan pola yang tidak linear antara nilai q dengan Packing density, dengan fluktuasi yang relatif kecil (perbedaan 1,5% antara nilai tertinggi dengan nilai terendah). Kemudian, perhitungan numerik dilakukan pada nilai q=0.28 untuk mendapatkan komposisi masing – masing agregat yang menghasilkan Packing density tertinggi. Komposisi ini terdiri dari 26.72% Agregat A MgO (0.044 mm - 1 mm), 9.82% Agregat B MgO (1 mm - 2 mm), 22% Agregat C MgO (2 mm - 5 mm), dan 23.47% Fine Powder MgO (0 mm - 0.044 mm). Untuk material MgAl_2 O_4, komposisi meliputi 9.4% Agregat A (0.044 mm - 1 mm), 3.45% Agregat B (1 mm - 2 mm), dan 5.15% Fine Powder (0 mm - 0.044 mm).
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Refractory bricks are crucial components in industries involving high temperatures, functioning to protect reactor/furnace walls from extreme temperatures. One of the main challenges in refractory brick production is achieving high Packing density and minimizing porosity during the greenbody formation stage. High greenbody porosity can lead to a decrease in mechanical strength and thermal conductivity of the final refractory brick product. This research aims to analyze the influence of particle size distribution "q" in the Modified Andreassen Packing Model calculations used to determine aggregate composition, by varying the q value to achieve the highest Packing density. The research methodology involves simulating greenbody formation in the powder compaction process using the Discrete Element Method with Rocky DEM software. Simulations were conducted by varying the distribution modulus "q" in the Modified Andreassen Packing Method theory from 0.21 to 0.30 in a mixture of 82% MgO particles and 18% MgAl₂O₄ particles. The compressive strength conditions and aggregate variations of MgO and MgAl₂O₄ materials used in this study were adjusted to match those used in the Magnesia-Spinel Refractory Bricks manufacturing industry at PT.Benteng Api Technic. Simulation results show that the best q value for achieving the highest Packing density is 0.28, with a value of 74.97%. Analysis reveals a non-linear pattern between q values and Packing density, with relatively small fluctuations (1.5% difference between the highest and lowest values). Subsequently, a numerical approach was applied to the q=0.28 value to obtain the composition of each aggregate that produces the highest Packing density. This composition consists of 26.72% MgO Aggregate A (0.044 mm - 1 mm), 9.82% MgO Aggregate B (1 mm - 2 mm), 22% MgO Aggregate C (2 mm - 5 mm), and 23.47% MgO Fine Powder (0 mm - 0.044 mm). For MgAl₂O₄ material, the composition includes 9.4% Aggregate A (0.044 mm - 1 mm), 3.45% Aggregate B (1 mm - 2 mm), and 5.15% Fine Powder (0 mm - 0.044 mm).
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Refractory Bricks, Powder Compaction, Modified Andreassen Packing Model, Aggregagte, Packing density |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ174 Maintenance and repair of machinery T Technology > TN Mining engineering. Metallurgy > TN693.M3 Magnesium |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Yudha Satria Aji Pratama |
| Date Deposited: | 12 Aug 2024 02:28 |
| Last Modified: | 27 Aug 2024 02:10 |
| URI: | http://repository.its.ac.id/id/eprint/114511 |
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