Development and application of the active pulsing air classification

In order to improve the separation efficiency in the air-solid phase, we proposed an innovative separation method called the active pulsing air classifier, which produce pulsing air by a pulsing air generator. In this way, the particles received a new acceleration action in each pulsing period, and then, it obtains a better performance than non-pulsing air separators in the laboratory scale. The dynamic equation of the motion particle in the active pulsing airflow was built up, showing that a higher density particle may get a small acceleration. The simulation results of airflow field show that the airflow turbulence acceleration will disperse the particles and a density dominant separation can be achieved. All high density particles, low density particles, and dust of waste catalyst can be acquired by the active pulsing air classifier. When the airflow velocity is 3.33 m/s, the frequency of air pulsing is 7/3 Hz, the separation efficiency of the active pulsing air classifier reaches its maximum: 97.63%. Based on our study, an industry-scale pulsing air classifier is developed, which provides a new and efficient method for resource reutilization.