内置过滤元件流化床的最小流化速度

Minimum Fluidizing Speed of a Fluidized Bed with Built in Filtration Elements

以新型流化床颗粒层过滤器为应用对象,对内置过滤元件的流化床最小流化速度进行了实验研究。实验发现,过滤元件浸入料层的有效面积越大,最小流化速度越大。通过定义元件浸入料层有效面积与床截面之比的无因次数,回归得到了内置过滤元件流化床最小流化速度的经验表达式,为过滤器的进一步研究奠定了基础。

With a novel fluidized-bed granular filter (FBGF) serving as an object of application an experimental investigation was conducted of the minimum fluidizing speed of a fluidized bed with built-in filtration elements. It has been discovered by the investigation that the greater the effective area of immersed material layer of the filtration element, the greater the minimum fluidizing speed. In this regard a dimensionless magnitude has been defined as the ratio between the following two items: the effective surface area of a filtration element immersed in the bed material, and the fluidized bed cross-section area. And, by means of regression obtained was an empirical expression of the minimum fluidizing speed of a fluidized bed with built-in filtration elements. This has laid a solid basis for the further study of a fluidized-bed granular filter.