Abstract
Hydrodynamics plays a crucial role in defining the performance of circulating fluidized beds (CFB), and pressure fluctuation signal has been used to analyze the dynamic behavior in it. From this point of view, in the present study, the power spectral characteristic of pressure fluctuation signal in CFB is analyzed based on fractal theory. Analysis also takes into account the power spectrum and correlation analysis of pressure fluctuation signal. Results show that the pressure fluctuation signal has the characteristic of 1/f noise when the solid circulating flow is smaller. Elsewhere when the solid circulating flow is increased, pressure fluctuation signal has the characteristic of Fractal Brownian Motion (FBM). The value of power spectral exponent ? is between 2~7, this value is fluctuant in the upper and bottom zone of riser, and it is somewhat steady in the middle zone of riser, which could be used to judge the transition of flow regimes from thin pneumatic flow to dense pneumatic conveying. Correlation analysis exteriorly indicated the chaos characteristic of pressure fluctuation signal in CFB.
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