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本文采用微波加热-红外热成像颗粒示踪和混合技术获得了球形颗粒、柱形轻质颗粒和柱形重质颗粒三种示踪颗粒在不同操作参数下的运动轨迹,同时,基于蒙特卡罗方法的基本思想,将颗粒停留时间分布转化为虚拟颗粒浓度,并通过考察分层界面高度和混合层高度两个特征参数研究了球形-非球异质颗粒系统的颗粒分离特性。结果表明,当操作气速达到球形颗粒的最小流化速度时,床层发生逆转;随后随流化气速增加,分层界面高度降低,但球形颗粒与重质颗粒的分层界面下降更明显,混合层高度均增加;在同一流化气速下,柱形重质颗粒-柱形轻质颗粒混合域最小。
In this paper, the motion trajectories of three kinds of tracer particles, spherical particles, cylindrical light particles and cylindrical heavy particles, under different operating parameters were obtained by microwave heating-infrared thermal imaging particle tracing and mixing technology. At the same time, Method, the particle residence time distribution is transformed into the virtual particle concentration. The particle separation characteristics of the spherical-aspherical heterogeneous particle system are investigated by examining the characteristics of the interface layer height and the mixing layer height. The results show that when the operating gas velocity reaches the minimum fluidization velocity of spherical particles, the bed reverses. With the increase of fluidized gas velocity, the delamination interface height decreases, but the delamination interface between spherical particles and heavy particles decreases more obviously , And the height of the mixed layer all increased. At the same fluidized gas velocity, the columnar heavy particle-columnar light particle mixed zone was the smallest.