Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effect of cohesive powders on pressure fluctuation characteristics of a binary gas-solid fluidized bed

  • Wei, Liping (School of Chemical Engineering, Northwest University) ;
  • Lu, Youjun (State Key Laboratory of Multiphase Flow in Power Engineering (SKLMFPE), Xi'an Jiaotong University) ;
  • Zhu, Jianbo (School of Chemical Engineering, Northwest University) ;
  • Jiang, Guodong (School of Chemical Engineering, Northwest University) ;
  • Hu, Jun (School of Chemical Engineering, Northwest University) ;
  • Teng, Haipeng (School of Chemical Engineering, Northwest University)
  • Received : 2018.01.22
  • Accepted : 2018.06.30
  • Published : 2018.10.01
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Abstract

The effect of cohesive particles on the pressure fluctuations was experimentally investigated in a binary gas-solid fluidized bed. The pressure fluctuation signals were measured by differential pressure sensors under conditions of various weight percentages of cohesive particles. The cohesive particles increased the fixed bed pressure drop per unit height and decreased the minimum fluidization velocity. The Wen & Yu equation well predicts the minimum fluidization velocity of the binary system. The addition of cohesive particles slightly decreased the bubble size in bubbling flow regime when the cohesive particles and the coarse particles mixed well, while the bubble size greatly decreased when the cohesive particles agglomerated on the bed surface. The time series of pressure fluctuations was analyzed by using the methods of time domain, frequency domain and wavelet transformation. The normalized standard deviation of pressure fluctuations decreased with increasing weight percentages of cohesive particles. A wide bandwidth frequency of 0 to 1 Hz got narrower with a single peak around 0.6 Hz with an increase in proportion of the cohesive particles. The meso-energy and micro-energy of pressure fluctuations were decreasing with increasing cohesive particles proportions, which indicated that adding cohesive particles could reduce the energy dissipation of bubble and particle fluctuations.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China Postdoctoral Science Foundation

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