The Great Cyclone Recovery System cannot only be judged by "the greater the wind and the higher the pressure drop, the better the recovery".What really needs to be matched is: The PSD offset → screening, contamination and film-forming quality access control of → primary recovery powder and secondary trapping powder of particles with → different grading efficiency in tangential flow field and residence time in → cyclones can be → actually recombined. Among them, four boundaries should be established first: The inlet wind speed determines whether the particles can be stably transported into the cyclone and the strength of the cyclone field, but there are applicable windows. Too low wind speed may cause pipeline deposition and penetration of usable powder to the second level; too high wind speed will significantly increase the risk of pressure drop, energy consumption, particle impact and re-entrainment, and does not guarantee that the separation efficiency will continue to increase in equal proportions. The cyclone pressure drop is the result of the operating state and is not a quality indicator that can be set separately from the flow rate, geometry, powder load and measuring point. The same pressure drop may come from high flow, or it may come from clogging, dust build-up, air leakage, point change, or downstream resistance coupling. The particle size distribution of the powder determines the classification difficulty of the cyclone. Larger, denser, and more agglomeratively stable particles are generally more susceptible to centrifugal separation; fine powder is more susceptible to secondary filtration with airflow, but the specific behavior is also influenced by particle shape, density, humidity, charged, agglomerated, and surface state. The secondary trapping amount is not equal to the secondary powder reusable amount. The secondary powder must pass the PSD, contamination, fluidity, live, fluidization, screening and film-forming quality verification before it can be included in the qualified reuse amount. Therefore,
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