Abstract：An experiment was conducted to investigate the effects of operating conditions, acoustic parameters(frequency and sound pressure) on nanoparticle fluidization behaviors in an acoustic spouted fluidized bed with a draft tube. An half-cylindrical column with a diameter of 120 mm and height of 1 200 mm was used as the column, TiO2 nanoparticles with an average diameter of 290 nm was used as raw materials while the high-speed atmosphere jet was used as the spouting gas. It was found that the sonic could effectively inhibit the channelings and improved the quality of the annulus to prevent bypass of the high-speed atmosphere jet, thus contributing to a stable powder circulation and speed up the circulation rate between annulus and the draft tube. Furthermore, the minimum spouting velocity of the nano-TiO2 particles was significantly reduced by introducing the sound wave. At a constant frequency, the minimum spouting velocity decreased as the sound pressure level increased. On the other hand, when the sound pressure level was fixed, the minimum spouting velocity was achieved with a critical frequency at 80 Hz, the frequency below or above 80 Hz resulted in higher velocity.
Pi Liqiang,Gao Kaige,Yang Xingcan et al. Fluidization Characteristics of TiO2 Nanoparticles in an Acoustic Spouted-Fluidized Bed with a Draft Tube[J]. 化学反应工程与工艺, 2016, 32(2): 114-119.
