Fluidization stability of vibrated fluidized bed and optimization of operating factors for fine coal separation

In order to study the effects of the vibration energy on the fluidization characteristics and separation performance of air dense medium fluidized bed, the fluidization characteristics of wide sized magnetite powder ( 0.3 ~ 0. 074 mm) were investigated with the gas-solid fluidized bed ( diameter 120 mm, height 350 mm)，t he results showed that the introduction of the vibration energy could reduce the critical fluidized velocity, and the standard deviation of bed density fluctuations reducing from 0.0459g/ cm3 to0.028 1 g 1 cm3. Under the optimal operation conditions, comparing with the conventional fluidized bed. The response surface method was co mbined with orthogonal experiment to study the importance of four various factors: amplitude A, frequency f, gas velocity V and static bed height H. The results indicate d that the significance of four various factors was A>V >f >H. Under the optimal operation conditions ofA= 1 mm, V= 1. 2Umf, f= 10 Hz, H = 80 mm, the experiments were conducted to separate Yongcheng Fine Bituminous Coal ( 6 ~ 1 mm) . Comparing with the conventional fluidized bed, the probable error E value of vibrated air de nse medium fluidized bed was reduced from0. 141 g/ cm3to0.111 g1 cm3.