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当散体颗粒在负压差移动床立管下端连接的锥形料斗中流落时，对料斗上方和气室中压力信号波动分别加以采集，经过快速傅立叶交换处理，得出：在压力和气泡控制区，料斗上方和气室中压力波动特征表现出在低频区有较小的波动幅值；而在气拴控制区内，料斗上方和气室中压力波动特征不仅在低频区有较高的幅值，而且两者压力波动信号相位相差π。这些压力波动特征可以用来监测料斗中散体颗粒的流落状态。
When the loose particles flow in the conical hopper connected to the lower end of the negative pressure differential moving bed standpipe, the pressure signals fluctuation above the hopper and the gas chamber are respectively collected and subjected to the Fast Fourier Transform process to obtain: in the pressure and bubble control zone , The pressure fluctuation characteristics above the hopper and in the gas chamber show a small amplitude of fluctuation in the low frequency range, whereas the pressure fluctuation characteristics above the hopper and in the gas chamber in the tether control zone not only have higher amplitudes in the low frequency range, but also The pressure fluctuations between the two signals phase difference of π. These pressure fluctuation characteristics can be used to monitor the flow of loose particles in the hopper.