Experimental investigation of filter cake deposition under cross-flow and static filtration conditions

Experimental investigation of filter cake deposition under cross-flow and static filtration conditions
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错流和静态过滤条件下滤饼沉积的实验研究

DOI:
10.1016/j.ces.2023.119417
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发表时间:
2024
影响因子:
4.7
通讯作者:
Sorrentino G
Sorrentino G
中科院分区:
工程技术2区
文献类型:
--
作者:
Sorrentino G

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错流速度,过滤压力和固体浓度对滤饼性能的影响进行了研究,通过使用一种新的过滤设置,允许在广泛的操作条件下进行过滤测试。该装置的主要特征是压力和错流速度是解耦的,因此可以独立地研究这些变量对滤饼性质的影响。过滤试验已经证明,颗粒侵入过滤介质孔中最初发生,导致形成外部滤饼。增加的错流速度在外部滤饼的表面处产生侵蚀性剪切应力,这限制了滤饼的生长,间接地维持了高滤液流速。这种高过滤速率赋予悬浮颗粒相当大的拖曳力,将大量颗粒驱入多孔基材中,这些颗粒可在其中存款。增加压力会放大这种内部颗粒沉积,特别是在没有外部滤饼或外部滤饼有限的情况下,以限制滤出液阻力并在滤饼表面筛滤颗粒。通过CT扫描和扫描电镜观察和论证了错流速度对孔堵塞和滤饼结构的影响。
Effects of cross-flow velocity, filtration pressure, and solid concentration on filter cake properties are studied by using a new filtration setup that allows performing filtration tests under a wide range of operating conditions. The main feature of this setup is that pressure and cross-flow velocity are decoupled, so it was possible to independently investigate the effect of these variables on filter cake properties. Filtration tests have demonstrated that particle invasion into filter media pores occurs initially, leading to the formation of an external filter cake. The increased cross-flow velocity creates an erosive shear stress at the surface of the external cake, which limits cake growth, indirectly maintaining a high filtrate flow rate. This high filtrate rate imparts a considerable drag force onto suspended particles, driving a high count into the porous substrate where these particles could deposit. Increasing pressure amplifies this internal particle deposition, particularly where there is no or limited external filter cake to limit filtrate drag and screen particles at the cake surface. The effect of cross-flow velocity on pore blocking and filter cake structure is observed and demonstrated by CT scanning and scanning electronic microscopy.
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