The invention discloses a
system and a process method for producing small-particle-size AP products with large circulation volume, the
system comprises a charging subsystem, a circulation subsystem, a belt
fine grain control subsystem, a cooling subsystem and a
crystallization subsystem which are connected through a pipeline in a
closed loop mode, the belt
fine grain control system is integrated in a traditional large circulation
crystallization system, and by adjusting the split ratio of
crystal mush returned to a crystallizer, the AP products with the
small particle size can be produced. And the content of
solid materials serving as seed crystals in the system is actively controlled (namely, the
solid materials are provided with fine grains). The industrial problems that the number of
crystal nucleuses is insufficient due to low
supersaturation degree in a large circulation process, and small-particle-size products cannot be produced easily are solved. The MPC
multivariable model prediction controller is used for cooperatively regulating and controlling the circulation amount and the
fine grain amount, and an ultrasonic anti-scaling and corrugated
pipe external cooler can be selectively arranged, so that the
granularity of a small-particle-size AP product is stable and controllable, meanwhile, the spheroidization degree and the
surface smoothness of the
crystal are remarkably improved, the free-running property, the stacking density and the
combustion performance of charge of a user are effectively improved, and the service life of the product is prolonged. The method is suitable for continuous, stable and large-scale production of high-quality AP.