STUDI NUMERIK 3D CFD-DEM ALIRAN GASPADAT DAN PERPINDAHAN PANAS DALAM FULL LOOP CIRCULATING FLUIDIZED BED PENGARUH KECEPATAN UDARA
| Main Author: | IRAWAN, CUCU |
|---|---|
| Format: | Thesis NonPeerReviewed Book |
| Bahasa: | eng |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://eprints.untirta.ac.id/3280/1/STUDI%20NUMERIK%203D%20CFD-DEM%20ALIRAN%20GASPADAT%20DAN%20PERPINDAHAN%20PANAS%20DALAM%20FULL%20LOOP%20CIRCULATING%20FLUIDIZED%20BED%20%20PENGARUH%20KECEPATAN%20UDARA.pdf https://eprints.untirta.ac.id/3280/ |
Daftar Isi:
- Heat transfer between particle-fluid media and solid surface has wide application in industries such as power plant, steel heat treatment, and chemical processes. One of the important application is the heat transfer between bed material and CFB surface. Circulating fluidized beds (CFB) is a relatively new technology with capabilities to achieve low pollutant emissions, fuel flexibility, and high efficiency. One of the factors affecting cfb performance is superficial gas velocity. In this study, modeling is done using CFD software which combined with DEM to study two phase particle-gas flow and relevant heat transfer mode between bed particles and riser wall in 3D full-loop CFB under different gas velocity. In CFD, mass conservation, momentum, and energy are solved by Navier-Stokes equations on a computational cell scale. DEM tracks particle motions as a discrete phase by using the Newton’s laws on an particle scale. Simulation results show that increasing gas velocity produces uniform dispersed particle flows along axial direction of riser column. Average velocity of gas flow at the riser core increase as the gas velocity increase. Futhermore, heat transfer coefficient between bed and riser wall increases with the increase of gas velocity. Heat transfer between the bad and riser wall is determined by heat transfer mechanism of wall-fluidparticle conduction with non-contact.