Abstract
Visual understanding of air and particle flow is important and useful in guiding biomass combustor design. This study investigates the effects of declination angles of tangential and secondary air pipes in a low-density biomass combustor chamber to achieve perfect contact between air and rice husk particle. The simulation was aided by computational fluid dynamics (CFD) method using the standard k-ε turbulent model. According to the result, tangential air pipes with a declination angle of 75 o provide the most intense air-particle contact which is maximal turbulent intensity of 168%, swirl amount of 3.0–3.5, particle path length of 5.1 m, and particle residence time of 2.3 s. Furthermore, four secondary air pipes with a declination angle of 60 o lower the escaped particle amount to 11.45% from previously 71.24%. This configuration can also create recirculation zones in the bottom area of the combustor which elevates the particle residence time to 766.9 s. • The air-particle turbulent flow behavior is complex phenomena. • CFD has been widely exploited to visualize the air-particle turbulent flow behavior. • Tangential air pipe declination of 75 o gives the most intense air-particle contact. • Secondary air providence creates a recirculation zone in the combustor bottom area. • Perfect air-particle contact is expected to complete biomass combustion conversion.
Published Version
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