The surge phenomenon of vibrating fluidized bed is a special phenomenon, when the diameter of the bubble increases to be equal to the diameter of the bed, the bed is separated into multiple segments by the bubble, forming a state of mutual separation of a bubble and a particle. At this time, the particle layer is pushed upwards by the bubble like a piston, and after reaching a certain height, the bubble bursts, causing the dispersion of some particles to decline.
This phenomenon will lead to the destruction of bed uniformity and poor gas-solid contact, which will seriously affect the yield and quality of the product. At the same time, the wear of the walls of the device is intensified, causing vibration of the equipment. In order to solve this problem, a baffle can be added when the bed is too high to destroy the growth of air bubbles and avoid the occurrence of surge.
In addition, factors such as bed height, container diameter, particle size and gas velocity also affect the occurrence of surge phenomenon. Generally speaking, the higher the bed, the smaller the container diameter, the larger the particles, and the higher the gas velocity, the more likely it is to surge. Therefore, it is necessary to comprehensively consider these factors in the operation process, and reasonably control the parameters such as bed height, container diameter, particle size and gas velocity to avoid the occurrence of surge phenomenon.
In conclusion, the surge phenomenon of vibrating fluidized bed is a phenomenon that needs to be paid attention to, and corresponding measures need to be taken to avoid its occurrence. At the same time, it is necessary to comprehensively consider various factors and reasonably control the parameters in the operation process to achieve an efficient and stable drying process.