Pulsed fluidized beds can make gas-solid mix and contact more uniform, therefore obviously improving heat transfer efficiency. The mixed pulsed fluidized bed, whose total gas flow is composed of stable gas flow and pulsed gas flow, is proposed in this research. Firstly, the experimental device for drying particles in a mixed pulsed fluidized bed is established. Pressure signals with different frequencies and gas flow ratios are collected, and flow pattern diagrams are obtained through a high-speed camera. Secondly, the CFD-DEM parallel numerical simulation method is constructed to research the mixed pulsed fluidized bed performance. Particle mixing, motion and heat transfer characteristics under different pulse frequencies and flow ratios are studied. Results show that particles in the mixed pulsed fluidized bed exhibit regular periodic motion, thereby promoting the mixing effect of particles. Moreover the bubble nucleation point moves to the bottom of the bed with the increasing pulse frequency. When the total gas velocity is relatively low, particle mixing effect can be enhanced by increasing the proportion of pulsed gas. However, when the velocity is relatively high, particle mixing effect will be enhanced by decreasing the proportion.

脉冲流化床可以使气固混合和接触更均匀，因此明显提高了传热效率。提出了一种混合脉冲流化床，其总气流由稳定气流和脉冲气流组成。首先，建立了在混合脉冲流化床中干燥颗粒的实验装置。收集具有不同频率和气体流量比的压力信号，并通过高速摄像机获得流型图。其次，建立了CFD-DEM并行数值模拟方法，研究了混合脉冲流化床的性能。研究了不同脉冲频率和流量比下的颗粒混合，运动和传热特性。结果表明，混合脉冲流化床中的颗粒表现出规律的周期性运动，从而促进颗粒的混合效果。此外，气泡成核点随着脉冲频率的增加而移动到床的底部。当总气体速度相对较低时，可以通过增加脉冲气体的比例来提高颗粒混合效果。但是，当速度相对较高时，通过减小比例可以增强颗粒混合效果。