METHOD FOR UNINVASIVELY MEASURING FLUIDIZED BED LEVEL OF TWO PHASE FLUIDIZED BED IN STRUCTURE FOR TREATING MATERIAL

PURPOSE: To increase yield, to improve thermal efficiency and to operate a reaction device under the condition where performance is maintained for a long period as to several points along the wall of a structure by relating a change in the vertical direction of the region of power spectrum below a resonance peak with a fluidized bed level. CONSTITUTION: An electric signal from an accelerometer that is proportional to a normal acceleration of a wall is amplified and transferred to a control room. In the control room, a power spectrum is measured. Then, a region below a peak is decided, and it is related to a fluidized bed level of a reaction device. In short, with the accelerometer attached in magnetic manner, an electric charge output proportional to an instantaneous acceleration of wall is generated, and by an electric charge amplifier, it is converted into a voltage output which is proportional to the normal acceleration of wall. The voltage is processed with a signal processor, and a power spectrum of acceleration is generated. The power spectrum of acceleration of wall contains a peak at a point corresponding to a wall resonance frequency. The peak frequency and its region is measured by a computer algorithm.