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magnetic filtration with magnetized granular beds:Basic principles and filter performance

China Particuology 2007年第1期5卷 71-83页

作者： Teymuraz Abbasov Department of Electrical-Electronics Engineering Inonu University Engineering Faculty 44280 Malatya Turkey

This study is devoted to the explanation of different characteristics of magnetic filtration and the way these characteristics affect the important filtration parameters. magnetic fields in pores and the force effect of these fields on magnetic particles and the magnetization properties of packed beds composed of ferromagnetic spheres and metal chips are evaluated. The profile of accumulation and capture regions of the particles, the variation of the fluid velocity in these regions and analytic expressions of particle capture radius are presented. The effects of filtration regime parameters on magnetic filter performance were investigated. An analytical expression has been obtained for the dependence of the logarithmic efficiency coefficient on filtration velocity, the geometry of filter elements, the particle size and other parameters of filtration. The stationary and non-stationary equations of the magnetic filtration processes are given. An expression of magnetic filter performance is shown with dimensionless parameters obtained from the filtration system. These relations are useful for calculations in engineering practice, including the design of magnetic filters, provision of suggestions on construction, and optimization and control of filter operation.

关键词： magnetic filtration Magnetized beds Particle filtration velocity Filter performance Capture radius

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magnetic filtration of an iron oxide aerosol by means of magnetizable grates

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China Particuology 2007年第1期5卷 140-144页

作者： A. Alvaro J.M. Rodríguez Paulo A. Augusto A.M. Estvez Department of Chemical Engineering University of Salamanca Plaza de los Caídos 1-5 37008 Salamanca Spain Department of Chemical Engineering University of Salamanca Plaza de los Caídos 1-5 37008 Salamanca Spain Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal

The cleaning of gases with low concentrations of small ferromagnetic or paramagnetic particles is a difficult task for conventional filtration. A new alternative procedure, magnetic filtration, is used in this work. Iron oxide aerosol was generated by elutriation of iron oxide particles from a fluidized bed consisting of a mixture of Geldart-C iron oxide powder and large spherical Geldart-B sand particles. The aerosol was filtered by means of a magnetic filter which consisted of one, two or three iron grates staggered to each other. The experimental installation contained also an isokinetic sampling system and a Microtrac SRA 150 Particle Analyser. A theoretical expression for filtration efficiency was deduced from a previous model taking into account the different forces acting on the iron oxide particles. Experimental filtration efficiency matches quite well calculated theoretical efficiency. It was found that an increase in particle size, in thee number of grates or in the applied magnetic field produced higher filtration efficiencies up to 100% in some cases. In all filtration experiments pressure drop through the magnetic filter was very small.

关键词： Iron oxide aerosol magnetic filtration Iron grates

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Study on Optimizing High-Gradient magnetic Separation—Part 2: Experimental Evaluation of the Performance of a New Designed magnetic Filter

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World Journal of Condensed Matter Physics 2016年第2期6卷 137-151页

作者： Yonas S. Shaikh Christian Seibert Percy Kampeis Trier University of Applied Sciences Environmental Campus Birkenfeld Institute for Biotechnical Process Design Birkenfeld Germany

The introduction of functionalized magnetizable particles and high-gradient magnetic separation represents a time and money saving alternative to conventional purification and separation unit operations in the biotechnical sector. This technique has some advantages especially for the recycling of immobilized enzymes. A new magnetic filter with sight glasses was constructed and produced to study the performance of high-gradient magnetic separation at varied parameters. By optical analysis the buildup of a clogging was identified as the major parameter which affected the separation performance. For the cleaning procedure, a two-phase flow of water with highly dispersed air bubbles was tested which led to a nearly complete cleaning of the filter chamber.

关键词： magnetic Particles magnetic filtration High-Gradient magnetic Separation Enzyme Biocatalysis

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Study on Optimizing High-Gradient magnetic Separation—Part 1: Improvement of magnetic Particle Retention Based on CFD Simulations

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World Journal of Condensed Matter Physics 2016年第2期6卷 123-136页

作者： Yonas S. Shaikh Christian Seibert Percy Kampeis Trier University of Applied Sciences Environmental Campus Birkenfeld Institute for Biotechnical Process Design Birkenfeld Germany

The introduction of functionalized magnetizable particles for the purification of enzymes or for the multi-use of pre-immobilized biocatalysts offers a great potential for time and cost savings in biotechnological process design. The selective separation of the magnetizable particles is performed for example by a high-gradient magnetic separator. In this study FEM and CFD simulations of the magnetic field and the fluid flow field within a filter chamber of a magnetic separator were carried out, to find an optimal separator design. The motion of virtual magnetizable particles was calculated with a one-way coupled Lagrangian approach in order to test many geometric and parametric variations in reduced time. It was found that a flow homogenisator smoothed the fluid flow, so that the linear velocity became nearly equal over the cross section in the direction of flow. Furthermore the retention of magnetizable particles increases with a high total edge length within the filter matrix.

关键词： Computational Fluid Dynamics Finite Element Method magnetic Particles High-Gradient magnetic Separator magnetic filtration Biocatalysis Enzyme Purification

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Discussion on design for alkaline cleaning system of continual annealing line

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Baosteel Technical Research 2010年第S1期4卷 117-页

作者： HE Daohong,YI Fan and LU Zhiyi Baosteel Engineering & Technology Group Co.,Ltd.,Shanghai 201900

Conventional process flow and main work mechanism of alkaline cleaning process of Continual Annealing Line are generally reviewed in the paper,and the work flow of design is analysed including the lye,rinse water circuit,conductivity detection circuit,utility media supply circuit and other main working ***,the heat demand of the alkaline cleaning system,rinse water system and dryer device are also *** parameter method in the heat-transfer theory is adopted to calculate the heating time of unsteady heat transfer for strips in the on-line *** the reasons why brush roller is of inverse brush and rinsing nozzles are equipped at the inlet side are *** and working principles of iron removal and degreasing devices for alkaline cleaning system,which adopt new magnetic filtration and ultra filtration processes,are ***,the bypass filtering method is used to calculate the processing capacity of magnetic filtration and ultra filtration ***,the related features of 3-Dimension software "PlantSpace" for designing a CAL in Baosteel are totally introduced,such as specification for piping,co-designing,pipe code and 3-Dimension design process.

关键词： alkaline cleaning heating time magnetic filtration ultra filtration 3-Dimension design

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