沸腾床层干燥是流体动力学中的一种基本物理现象。物料进入干燥室以后,即被通过篦子的高温高速气流吹起而呈悬浮或沸腾状态。固体颗粒在干燥室内为高温气流所包围,其表面压力高于周围介质压力,形成一个压差,使水分蒸发,达到热、质交换的目的。沸腾层的体积比密实的不动层的体积大,这两个体积之比称为沸腾层的膨胀度。膨胀度与物料的组成、物理性质等有 Ebb drying is a fundamental physical phenomenon in fluid dynamics. Material into the drying chamber later, that is, through the high-speed gas blowing grate and was suspended or boiling state. Solid particles in the drying chamber is surrounded by high-temperature airflow, the surface pressure is higher than the pressure of the surrounding medium to form a pressure difference, so that evaporation of water, to heat, the purpose of quality exchange. The volume of the boiling layer is larger than that of the solidified layer, and the ratio of these two volumes is called the swelling degree of the boiling layer. Expansion and the composition of the material, physical properties and so on