Experimental investigation of hydrodynamic vibratory filtration

Abstract

The mechanism of vibratory hydrodynamic filtration is examined. A description is given for a developed and tested experimental bench based on a prototype hydrodynamic vibratory filter, and characteristic features of the design and operation of its individual subassemblies are indicated. Preliminary test results, which have demonstrated promise for a proposed cleaning circuit, are presented.The theory of fluid and contaminant-particle motion in the vicinity of a rotating and vibrating permeable filtering partition (FP) is deemed to be the basis of the principle of hydrodynamic vibratory filtering (HVF). Moreover, the cleaning of a fluid in HVF is accomplished by the following combination of hydromechanical processes: Filtration through a permeable structure; centrifugal separation, and, vibratory breakdown of the deposit that forms on the FP following its hydrodynamic flushing and removal from the system.Due to combination of these processes, the effectiveness of removal of the solid fraction from the fluid is increased, and self-cleaning (regeneration) of the FP is carried out during operation of the HVF, improving its carrying capacity and remaining service life. Here, the energy outlays for the cleaning are substantially lower than those in centrifuges, including filtering centrifuges. Structural diagrams of the HVF are presented in [1][2][3][4].The filtration and filtering of highly viscous fluid media are not well understood, particularly under conditions where processes are combined in HVF. The greatest difficulties arise in developing a theory of flow for these fluids through porous structures under nonsteady conditions. Assumptions and simplifications that do not make it possible to obtain a complete picture of the processes, are used in formulating a theory for the filtration and filtering of fluids. Lack of an adequate model of the hydrodynamics of a fluid in an HVF is a problem standing in the path of the creation of a procedure for analysis of similar equipment. The creation of a computational analytical model of hydrodynamic vibratory filtering, and the development of engineering procedures for the analysis require experimental investigations for which an experimental bench (EB), which makes it possible to perform tests over a broad range of HVF operating regimes and parameters of the medium being cleaned, has been built [5].Hydraulic Circuit of EB (Fig. 1) and Characteristics of Its Design and Operation of Its Individual Subassemblies. The fluid to be cleaned is fed by gear pump 2 from initial container 1 into HVF system 3, where mechanical impurities are removed. The FP of the HVF is rotated by dc electric motor 4 via a V-belt transmission. Vibration of the FP is created by dc electric motor 5 by means of its link gear (LG) 6. The electric motors are fitted with tachometers.Operation of the EB is possible through both closed and open circuits. When operating in a closed circuit, the fluid to be cleaned in the HVF is fed by pump 8 from receiving container 7 into the initial container. As a result of ...

System for Centralised Collection, Recycling and Removal of Waste Pickling and Galvanic Solutions and Sludge

“…The majority of designs created for filtration of liquids imply flowing of the treated suspension under pressure through porous filtrating surface with formation of sediments [5,6,7,[11][12][13][14][15][16][17][18][19][20][21][22]. Mainly these sediments retard filtration, they are to be periodically removed, and finally decrease the filters capacity and the quality of the product.…”