On the basis of a cold state high-density circulating fluidized bed(CFB)test bench with diameter of0.205 mand height of 7m

the wavelet theory was employed to investigate the pulsation characteristics of the pressure under conditions with different circulation flow rates and outlet structures

at superficial gas velocity of6.3m/s.The results show that the pressure pulsation under both high-density and low-density conditions was low frequency pulse and its amplitude ranged from 0Hz to 12.5Hz.With the same outlet structure and superficial gas velocity

the main bed pressure and its pulsation amplitude increased with the circulation flow rate.With the same superficial gas velocity and circulation flow rate

both the main bed pressure and growth rate of pressure pulsation amplitude of the wind chamber withГ-type mutation outlet structure were stronger than that of the one with C-type smooth export structure.