Abstract：In order to elucidate the fluidization mechanism of ultrafine powder in the spouted-fluidized bed with a draft tube and establish the foundation for further optimization and improvement of the fluidized bed structure and operating conditions, the numerical simulation of the flow field in the spouted-fluidized bed with draft tube was carried out using the standard k-ε turbulence model. The effects of inlet fluidizing gas velocity and ejecting gas velocity on the flow field and velocity distribution were investigated. Meanwhile the effects of sound pressure level and sound frequency on distribution of axial gas velocity and root mean square (RMS) in annulus and fountain areas were investigated, respectively. The results showed that the gas flow in the spouted-fluidized bed with draft tube was characterized by the internal circulation at high velocity jet flow. The gas flow rate decreased with the increase of the fluidizing gas velocity and increased with the ejecting gas velocity. The introduction of sound field made the distribution of the gas flow in annulus area and fountain area more uniform, which significantly increased the intensity of turbulence in annulus and fountain area. The intensity of turbulence increased with the increase of sound pressure level and decreased slightly with the increase of sound frequency.
Zhang Qing,Yang Xuefeng,Zhou Yong. Numerical Simulation of Single-Phase Flow and Influence of Acoustic Field in a Spouted-Fluidized Bed with a Draft Tube[J]. 化学反应工程与工艺, 2016, 32(6): 498-503.
