Study of charged particles trajectories in free-fall electrostatic separators

Labair, Hakima; Touhami, Seddik; Tilmatine, Amar; Hadjeri, Samir; Medles, Karim; Dăscălescu, Lucian

doi:10.1016/j.elstat.2017.01.010

Cited by 34 publications

(8 citation statements)

References 13 publications

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“…This phenomenon also was observed in practical experiments. In the study of charged particles trajectories by simulating free‐fall electrostatic separators, Labair et al () showed that an increase of the potential difference ΔU is desired to obtain a good separation. However, an excessive increase of ΔU in the presence of particles characterized by a high Q/m ratio may cause collisions between particles and electrode that affect the quality of the product recovered at separator outlet.…”

Section: Resultsmentioning

confidence: 99%

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A roll‐type corona discharge–electrostatic separator for separating wheat grain and straw particles

Jafari

Chegini

Akmal

et al. 2019

J Food Process Engineering

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Different methods such as mechanical, pneumatic, and electrical techniques have been used in the separation process of impurities from agricultural products. In electrical systems, three methods, that is, triboelectrostatic, free fall, and roll type with high‐voltage corona discharge electrodes, are usually used. In the present study, separation trajectory of grain and wheat straw are firstly predicted using simulation of roll‐type corona system configuration in COMSOL Multiphysics and MATLAB. Experimental tests are conducted to determine the separation performance of a roll‐type corona apparatus with 10, 15, 20, 25, and 30 kV voltages at 50, 70, and 90 rpm drum rotational speeds. The simulation results showed that the trajectory of the grain particles deviated from that of straw when the voltage increased from 10 to 30 kV as well as increasing the rotational speed from 50 to 90 rpm. Although the rotational speed of 70 rpm resulted in a good separation of grains from straw particles, increasing the speed to 90 rpm not only did not improve the separation performance but also caused a dispersal of the particles and reduced the separation quality. The simulation results were in good accordance with the experimental results obtained from the developed prototype. Practical applications The results of this study can be used in configuration optimization design of “Corona Type Cylindrical Electrostatic Separation” for separating seed and straw in agriculture production, especially where they cannot be separated by conventional methods.

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Section: Resultsmentioning

confidence: 99%

“…In the study of charged particles trajectories by simulating free-fall electrostatic separators, Labair et al (2017) showed that an increase of the potential difference ΔU is desired to obtain a good separation.…”

Section: Simulation Resultsmentioning

confidence: 99%

A roll‐type corona discharge–electrostatic separator for separating wheat grain and straw particles

Jafari

Chegini

Akmal

et al. 2019

J Food Process Engineering

View full text Add to dashboard Cite

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“…정전선별과 관련 된 종래의 연구들은 주로 장치 개발, 공정 연구 및 선 별조건 실험연구 등이 주를 이루어 왔다. 최근에 Dascalescu 그룹은 입자 거동에 관한 전극 형상, 선별기 종류, 전기장세기 및 입자 크기의 영향 연 구를 수학적 모델링에 기반으로 하여 수행하고 있으며, 롤타입 코로나방전 정전선별기를 이용한 전도성 입자의 궤적모사가 실제궤적과 유사한 결과를 얻은 바 있다 [13][14][15][16][17][18][19][20][21] . Vlad 등은 경사판 정전선별기에서 유도전극 표면의 전 기장세기를 조절하여 인위적 시료인 폴리아미드(PA) 볼 과 쇠구슬의 입자거동을 예측할 수 있는 수학적 모델링 연구를 수행하였다 [14][15][16][17] .…”

Section: 서 론unclassified

Trajectory Simulation of ASR Particles in Induction Electrostatic Separation

Kim¹,

Park²

2019

J. of Korean Inst. of Resources Recycling

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Automobile shredder residue (ASR) is the final waste produced when end-of-life vehicles (ELVs) are shredded. ASR can be separated using mineral-processing operations such as comminution, air classification, magnetic separation, and/or electrostatic separation. In this work, trajectory analyses of conductors (copper) and non-conductors (glass) in the ASR have been carried out using induction electrostatic separator for predicting or improving the ASR-separation efficiency. From results of trajectory analysis for conductors, the trajectories of copper wire by observation versus simulation for coarse particles of 0.5 and 0.25 mm showed consistent congruity. The observed 0.06 mm fine-particles trajectory was deflected toward the () attractive electrode owing to the charge-density effects due to the particle characteristics and relative humidity. In the case of non-conductors, the actual trajectory of dielectric glass deflected toward the () electrode, showing characteristics similar to those of conductive particles. The analyses of stereoscopic microscope and SEM & EDS found heterologous materials (fine ferrous particles and conductive organics) on the glass surface. This demonstrates the glass decreasing separation efficiency for non-ferrous metals during electrostatic separation for the recycling of ASR. Future work will require a pretreatment process for eliminating impurities from the glass and advanced trajectory-simulation processes.

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“…via collisions of particles with the walls or with other pre-charged particles. In some applications, such as powder coating (Yang et al 2016), electrostatic precipitation (Horender, Schaub & Sommerfeld 2014), triboelectric separation (Labair et al 2017) and spray painting (Böttner & Sommerfeld 2002), particle charging takes place deliberately to control the particles' trajectories. However, in some other powder-handling facilities, such as fluidized beds, it occurs incidentally and leads to operational problems (Fotovat, Bi & Grace 2017.…”

Section: Introductionmentioning

confidence: 99%