Studi Numerik Karakterisasi Aliran 3 Dimensi Multifase (Gas-Solid) Pada Gravity Settling Chamber Dengan Variasi Kecepatan Inlet Dan Diameter Partikel Pada Aliran Dilute Phase
Submission Date: 2013-08-19 18:03:28
Accepted Date: 2013-08-20 12:43:16
Abstract
Kegiatan pemilahan pada aktivitas produksi merupakan salah satu kegiatan yang banyak dilakukan pada dunia industri. Penggunaan gravity settling chamber merupakan teknologi pemilahan partikel yang paling sedehana dan murah. Maka dalam perancangan suatu gravity settling chamber perlu diketahui parameter yang mempengaruhi kinerja dari alat tersebut. Analisa karakteristik aliran pada gravity settling chamber dilakukan dengan metode simulasi numerik menggunakan persamaan Eularian-Lagrangian. Sebuah aliran multifase udara dan partikel abu terbang batu bara (fly ash)berdiameter 100 μm mengalir melalui sebuah gravity settling chamber dengan variasi diameter hidrolis saluran inlet sebesar 1/3 1/5 dan 1/7 kali dari diameter hidrolis ruang pengendap dengan laju kapasitas aliran yang sama . Selain divariasikan kecepatan inlet aliran, juga dilakukan variasi distribusi diameter dengan ukuran partikel kurang dari 50 μm, ukuran 50 -100 μm dan ukuran 100-200 μm. Hasil yang didapatkan dari penelitian ini adalah semakin kecil ukuran diameter partikel maka akan efisiensi partikel yang ditangkap oleh gravity settling chamber semakin rendah. Ukuran partikel tidak berpengaruh terhadap posisi jatuh dari partikel tersebut. Semakin besar kecepatan inlet tidak memiliki hubungan dengan efisiensi penangkapan partikel. Pressure drop yang terjadi akan semakin besar sebanding dengan rasio perbandingan diameter hidrolis inlet dan ruang pengendapan, serta jumlah dan posisi secondary flow berperan signifikan pada efisiensi penangkapan partikel.
Keywords
Aliran multifase gas-solid; gravity settling chamber; diameter partikel
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