Electrostatic separation for recycling silver, silicon and polyethylene terephthalate from waste photovoltaic cells

2017 ◽  
Vol 31 (11) ◽  
pp. 1750087 ◽  
Author(s):  
Zisheng Zhang ◽  
Bo Sun ◽  
Jie Yang ◽  
Yusheng Wei ◽  
Shoujie He
Keyword(s):  
Polyethylene Terephthalate ◽  
High Voltage ◽  
Separation Efficiency ◽  
Angular Position ◽  
Radial Position ◽  
Roll Speed ◽  
Electrostatic Separation ◽  
Voltage Level ◽  
Roll Type ◽  
Corona Electrode

Electrostatic separation technology has been proven to be an effective and environmentally friendly way of recycling electronic waste. In this study, this technology was applied to recycle waste solar panels. Mixed particles of silver and polyethylene terephthalate, silicon and polyethylene terephthalate, and silver and silicon were separated with a single-roll-type electrostatic separator. The influence of high voltage level, roll speed, radial position corona electrode and angular position of the corona electrode on the separation efficiency was studied. The experimental data showed that separation of silver/polyethylene terephthalate and silicon/polyethylene terephthalate needed a higher voltage level, while separation of silver and silicon needed a smaller angular position for the corona electrode and a higher roll speed. The change of the high voltage level, roll speed, radial position of the corona electrode, and angular position of the corona electrode has more influence on silicon separation efficiency than silver separation efficiency. An integrated process is proposed using a two-roll-type corona separator for multistage separation of a mixture of these three materials. The separation efficiency for silver and silicon were found to reach 96% and 98%, respectively.

The Roller Speed Control of High Voltage Electrostatic Separator Based on PLC

2014 ◽  
Vol 1037 ◽  
pp. 240-243
Author(s):  
Zi Sheng Zhang ◽  
Jin Cui ◽  
Qing Yang ◽  
Shi Ming Ren ◽  
Bo Sun
Keyword(s):  
High Voltage ◽  
Separation Efficiency ◽  
Motor Speed ◽  
Loop Control ◽  
Roller Speed ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Roll Type ◽  
Electrostatic Separator ◽  
To Receive

The main aim of this paper is improve the high voltage electrostatic separation efficiency of roll-type electrostatic separator. To this end, a method of controlling the roller to obtain the best rotate speed was introduced. Experiments of system design were performed on 315-2DP type Programmable Logic Controller (PLC) produced by Siemens, E6B2 - CWZ6C encoder provided by Omron and MM440 converter obtained from Siemens. According to the nature differences of the separation particles, presetting the roller rotation speed in the upper machine. Then it is downloaded to the PLC. Through the tail encoder of the motor to receive the signals, calculating the roller speed and feedback to the PLC to control the converter, then formed a closed-loop control system of the motor speed.

High-Voltage Electrode Position: A Key Factor of Electrostatic Separation Efficiency

2004 ◽  
Vol 40 (3) ◽  
pp. 905-910 ◽  
Author(s):  
F. Aman ◽  
R. Morar ◽  
R. Kohnlechner ◽  
A. Samuila ◽  
L. Dascalescu
Keyword(s):  
High Voltage ◽  
Separation Efficiency ◽  
Electrode Position ◽  
High Voltage Electrode ◽  
Electrostatic Separation ◽  
Key Factor

Developed of High Voltage Bushing with New Shielding Technology for High Voltage Switch Cabinet

2015 ◽  
Vol 737 ◽  
pp. 247-251
Author(s):  
Fu Yun Zhu ◽  
Zhi Hui Lu ◽  
Hong Jun Ni ◽  
Shuai Shuai Lv ◽  
Xing Xing Wang
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Metal Mesh ◽  
Voltage Level ◽  
Conductive Material ◽  
Average Value ◽  
Three Samples ◽  
Result Show ◽  
Aluminum Cylinder ◽  
The Way

TGZ10A-40.5 wall bushing of high voltage switch cabinet from one company was taken as applied research object. Reference the development process of high voltage cable shielding technology, three samples were designed and produced depending on different sets of the shield system. The result show that: surfaces processed by the way that the inner (aluminum cylinder) and the outer (metal mesh ring) shielding components were coated with a semi-conductive material, made little sense to improve the withstand voltage level and reduce the partial discharge; surface processed by the way that inner shield component (aluminum cylinder) was coated with semi-conductive material, the outer shield component (metal mesh ring) was not coated with semi-conductive material, was obviously influenced the improvement of the withstand voltage level and reduction of the partial discharge, compared with traditional technology, the average start voltage of corona increased 23.8%, the average value of partial discharge dropped 27.7%.

Influence of Radial Position of Medium Size High Voltage Asynchronous Motor Stator Ventilation Channel Peri-Axle Terminal on Fluid Flow Pattern

2011 ◽  
Vol 201-203 ◽  
pp. 818-823
Author(s):  
Jia Bin Wen ◽  
Hong Yu Yan
Keyword(s):  
Fluid Flow ◽  
High Voltage ◽  
Optimization Design ◽  
Asynchronous Motor ◽  
Ventilation System ◽  
Flow Characteristics ◽  
Radial Position ◽  
Medium Size ◽  
Fluid Flow Characteristics ◽  
Ventilation Duct

Fluid flow inside radial ventilation duct is one of important facts which to decide the effect of ventilation and cooling, there is important significance to investigate.In this paper,according to the theory of Computational Fluid Dynamic(CFD),a YKK400-6、690kW medium size high voltage asynchronous motor was taken as an example.Created its 3D stator and rotor radial duct physical and mathematical model,basic assumptions and boundary conditions are determined according to CFD theories.The fluid fields are calculated and analyzed,and fluid field distribution inside radial ventilation duct is shown.Base on the length of the stator ventilation channel as a constant,changing the radial position of the stator ventilation channel peri-axle terminal,and the fluid flow characteristics are shown when the radial position was changed.Analyzing the fluid flow characteristics on either side of the stator winding,and obtaining the influence of the radial position of the stator ventilation channel peri-axle terminal on fluid flow characteristics.The results provided theoretical basis for the optimization design of motor ventilation system,and those paved the way for solving temperature field based on coupled field.

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