Research on fluidized density distribution of new fine-grained and heavy medium mineral gas-solid separation
Coal separation can effectively improve the quality of coals,gas-solid fluidized bed dry coal preparation applies fluidized bed technology to the field of coal preparation,which helps achieve dry coal quality improvement.In order to solve the problem of large density fluctuations in traditional Geldart B heavy medium fluidized bed separation,Geldart A fine-grained heavy medium was proposed for gas-solid fluidization separation.The density distribution characteristics of a new fine-grained heavy medium gas-solid fluidized bed were systematically studied,the stability of bed density and the coal separation effects were studied,and the variation rules of bed density variance and separation efficiency were analyzed.The results showed that the bed density distribution of fine-grained heavy medium was more uniform,and the axial density difference was lower.Based on the bed expansion behaviors,a prediction model of bed density in a fine-grained heavy medium fluidized bed was established with a density fluctuation within±0.1 g/cm3,which could effectively predict the distribution of bed density and solve the problem of density control in the coal separation process.
dry separationfluidized beddensity distributiondensity predictionheavy medium
NETL
NSTL
万方数据
