The Effect of the Packing Materials on the Pressure Fluctuations in Fluidized Bed

유동층 연소로에서 충전물이 압력 요동 특성에 미치는 영향

  • Kim, Mi Young (Department of Chemical Engineering, Chunbuk National University) ;
  • Jo, Byung Yeol (Department of Environmental Engineering, Chunju National University) ;
  • Park, Sang Chan (Department of Environmental Engineering, Chunju National University) ;
  • Lee, Dong Kyu (Department of Industry Chemical Engineering, Chunbuk National University) ;
  • Kim, Eui Sik (Department of Chemical Engineering, Chunbuk National University)
  • Received : 1998.05.06
  • Accepted : 1998.07.24
  • Published : 1998.11.10


Effects of packing materials on the pressure fluctuations in a fluidized bed have been analysed using statistical method to interpret fluidized bed behavior. The experiments were carried out in a fluidized bed of 6.7cm - ID, and the experimental variables were particle size and its distributions, fluidizing velocity, aspect ratio, and packing materials, etc. Screen packings are used as packing material, the properties of the pressure fluctuations in the fluidized bed were measured by a differential pressure transducer. The measured properties for the pressure fluctuations were the mean, the standard deviation, and the major frequency of the power spectral density functions, etc. The standard deviations of the pressure fluctuations have been slightly affected in the radial directions of fluidized bed, and almost constant in axial directions the height above 4.5cm of the distributor of fuidized bed without packing materials. The major frequency decreased with increaing packing size, whereas it showed maximum at 10% of packing materials. It has been found that the standard deviation of the pressure fluctuations can effectively explain the fluidized phenomena, and the packing materials severely affected the properties of the pressure fluctuations.


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