As an essential resource, the drying, upgrading, and
efficient
utilization of lignite are of great significance to the development
of the low-carbon economy. In this work, a novel drying system, combining
a pneumatic and spouted bed, is designed to achieve lignite deeply
dewatering. The system is investigated experimentally and numerical
simulated to characterize the hydrodynamics of particles moving across
the domain, such as pressure drop, fountain height, and pressure fluctuation.
The results show that there is a critical gas velocity that changes
the flow pattern of the bed when the static bed is higher than 50
mm. When the gas velocity increases to the critical value, the spouting
state becomes unstable and the corresponding pressure drop will undergo
a secondary mutation. This work provides a deeper understanding of
the flow structure and particle motion in the novel drying system
under various industrial operating conditions.