• Title/Summary/Keyword: 하전율

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Characteristics of Charging and Collection of 10-nm-Class Ultrafine Nanoparticles in an Electrostatic Precipitator (전기집진기의 10 nm 급 초미세 나노입자의 하전 및 집진 특성)

  • Han, Bang-Woo;Kim, Hak-Joon;Kim, Yong-Jin;Song, Dong-Keun;Hong, Won-Seok;Shin, Wan-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.10
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    • pp.1013-1018
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    • 2011
  • The charging of 10-nm-class nanoparticles in an electrostatic precipitator (ESP) according to particle charging ratio has been investigated and compared to the diffusion effect of the nanoparticles. The competition between the charging probability and the diffusion loss effect determines the collection efficiency of nanoparticles in the ESP. The collection efficiency of nanoparticles decreased continuously with decreasing particle diameter. This indicates that the partial charging effect of 10-nm-class nanoparticles is more dominant than their diffusion loss effect in the ESP for nanoparticles in the particle size range of less than 10 nm. The charging ratios based on unipolar diffusion charging calculations were in good agreement with the experimental collection efficiencies for nanoparticles less than 10 nm in diameter.

Recovery of PET from Final Plastic Wastes using HDPE Cyclone Charger (HDPE 싸이클론 하전장치(荷電裝置)를 이용한 종말품(終末品) 폐(廢)플라스틱으로부터 PET의 회수(回收))

  • Jeon, Ho-Seok;Park, Chul-Hyun;Baek, Sang-Ho;Kim, Byoung-Gon
    • Resources Recycling
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    • v.16 no.5
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    • pp.51-56
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    • 2007
  • Plastics are widely used in everyday life as very useful material. In Korea, about 4 million tons of plastic wastes are generated annually. However, recycling ratio is below 30%, and most of plastic wastes are disposed by landfill and incineration. Hence, the development of material separation technique that can recycle plastic wastes is a necessary situation. In this study, Triboelectrostatic separation for recovery of PET from final plastic wastes obtained from the sink product after wet-type gravity separation has been carried out. In the charging properties, the charge polarity and charge density of PET and PVC were very effective with the tirbo-charger made of PP and HDPE with the decrease in relative humidity. In material separation using HDPE cyclone charger, a PET grade of 96.80% and a recovery of 85.0% were achieved at 30 kV and the splitter position -2cm from the center. In order to obtain PET grade of 98.5%, PET recovery should be sacrificed by 24% with moving the splitter from the center to -6cm position.

폐전선 피복플라스틱 재활용을 위한 PVC, Rubber의 하전특성 연구

  • Jeon, Ho-Seok;Park, Cheol-Hyeon;Kim, Byeong-Gon;Park, Jae-Gu
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2005.05a
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    • pp.375-376
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    • 2005
  • 본 연구에서는 폐전선 피복플라스틱의 재활용을 위해 마찰하전형 정전선별법을 이용하여 PVC와 rubber의 재질분리 실험을 수행하였다. 하전물질의 종류에 따른 실험결과 PVC와 Rubber의 중간 일함수 값을 갖고 있는 PP 재질이 가장 효과적이었으며, 단일 시료보다PVC와 Rubber의 혼합조건에서 더 높은 하전 값을 나타내었다. 하전특성 실험결과 공기량은 10.28wt/s 이상 그리고 상대습도는 40% 이하의 조건에서 입자의 높은 하전량을 얻을 수 있음을 확인하였다. 분리특성 실험결과 전압세기가 25kv 이상 그리고 분리대의 위치는 전기장의 중앙(0)으로부터 Negative 전극으로 -lcm 이동한 지점으로, 이때 PVC의 품위와 회수율을 각각 99.5%와 95%인 결과를 얻었다.

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A Study on Material Separation of Waste Plastics Beer Bottle by Triboelectrostatic Separation (마찰하전형(摩擦荷電型) 정전선별(靜電選別)에 의한 폐플라스틱 맥주병 재질분리(材質分離)에 관한 연구(硏究))

  • Jeon, Ho-Seok;Delgermaa, Delgermaa;Baek, Sang-Ho;Park, Chul-Hyun;Choi, Woo-Zin
    • Resources Recycling
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    • v.17 no.1
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    • pp.43-50
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    • 2008
  • In this study, we carried out the research on triboelectrostatic separation for materials separation of PET & Nylon recovered to waste plastic beer bottle. From the research on charging characteristic for choice of charging materials, it was found that PMMA was optimum charging material to make high charging amount with opposite polarity for PET & Nylon in waste plastic beer bottle. Therefore, we manufactured a charger of pipe line and cyclone type using PMMA material for separation of PET and Nylon. At optimum test conditions that used PMMA pipe line and cyclone charger developed in this study, we developed a triboelectrostatic separation technique that can separate PET plastic up to grade of 99.6% and recovery of 88.2%. We established new separation technology that can recycle the PET and Nylon recovered from waste plastic beer bottle.

Triboelectrostatic Separation of Mixed Three Kinds of Plastics by a Two-stage Separation Process (2단계(段階) 분리공정(分離工程)에 의한 3종(種) 혼합(混合)플라스틱의 마찰하전(摩擦荷電) 정전선별(靜電選別))

  • Park, Chul-Hyun;Jeon, Ho-Seok;Baek, Sang-Ho;Park, Jai-Koo
    • Resources Recycling
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    • v.16 no.5
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    • pp.57-64
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    • 2007
  • Triboelectrostatic separation of mixed three kinds of plastics, PVC, PET and PMMA, in the range of similar gravity has been performed through a two-stage separation process. Polypropylene (PP) and high-impact polystyrene (HIPS) were found to be the most effective materials for a tribo-charger in the separation of PVC, PET and PMMA. In the 1st stage using the PP cyclone charger, PVC grade and recovery depended considerably on the air velocity (10 m/s), the relative humidity (<30%), the electric field (>200 kV/m) and the splitter position (+2 cm from the center) in the triboelelctrostatic separator unit. At an optimum condition a PVC grade of 99.6% and a recovery of 97.5% was achieved. In the 2nd stage using the HIPS cyclone charger, a PMMA grade of 98.3% and a recovery of 97.0% was obtained under the conditions of 10m/s air velocity, over 250 kV/m electric field, central splitter position and less than 40% relative humidity.

Development of Recycling Technique of Mill Reject Produce using Ttiboelectrostatic Separation (마찰하전형정전선별법을 이용한 Mill Reject 산물 재활용 기술개발)

  • 전호석;한오형;신선명;윤로한
    • Resources Recycling
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    • v.11 no.2
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    • pp.20-27
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    • 2002
  • This study was to develop the triboelectrostatic separation technique to recycle the coal from about 20% of mill reject products remained by grinding process in the coal thermoelectric power plant. In this study, we get a test results that can product the cleaned coal of 15% ash content and 66.23% recovery from mill reject of 47% ash content. And then, from the result of the releases analysis, we proved the excellence of treatment method, after showing the treament processing which is able to get 80% of recovery of coal from 20% of ash content demanded in the power plant.

A Study on Material Separation of Heavy Group Plastics by Triboelectrostatic Separation (마찰하전형(摩擦荷電型) 정전선별(靜電選別)에 의한 고비중(高比重) 플라스틱 혼합물(混合物)의 재질분리(材質分離)에 관한 연구(硏究))

  • Jeon, Ho-Seok;Baek, Sang-Ho;Park, Chul-Hyun;Kim, Byoung-Gon
    • Resources Recycling
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    • v.16 no.2 s.76
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    • pp.56-62
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    • 2007
  • In this study, we carried out the research on triboelectrostatic separation for heavy group plastics (PET, PVC) recovered from wet gravity separation. From the research on charging characteristic for the choice of charging materials, it was found that PP was optimum charging material to make high charging amount with opposite polarity for PET and PVC of heavy group. Therefore, we manufactured a charger of cyclone type using PP material for separation of PET and PVC. At optimum test conditions that used PP cyclone charger developed in this study, we developed a triboelectrostatic separation technique that can separate PET plastic up to grade of 98.5% and recovery of 86.2%. We established new separation technology that could recycle the PET and PVC heavy group plastics recovered from wet gravity separation.

The Development of Material Separation Technique for Recycling of Waste Car Tail Lamp (폐자동차(廢自動車) Tail Lamp의 재활용(再活用)을 위한 재질분리(材質分離) 기술개발(技術開發))

  • Jeon, Ho-Seok;Park, Chul-Hyun;Baek, Sang-Ho;Park, Jai-Koo
    • Resources Recycling
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    • v.15 no.6 s.74
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    • pp.25-32
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    • 2006
  • In this study, waste car tau lamps that usually gets incinerated or buried has been recovered during the dispose process in order to increase the recycling rate of waste cars and the material separation research was performed by applying triboelectrostatic separation method. After a series of charging characteristic test, PMMA materials was confirmed of being an effective charging material for waste car tail lamp material separation, a cyclone charger using PMMA material for continuous process was developed. In optimum test conditions using triboelectrostatic separator developed in this study, high quality PMMA material with recovery rate of 99.0% and 90.2% was achieved from the waste car tail lamp. Therefore, a material separation technology that can recycle tail lamps of waste cars has been established.

Development of Triboelectrostatic Separation Technique for Material Separation of EVA & PET Mixture Plastic Wastes (EVA와 PET 혼합(混合) 폐플라스틱의 재질분리(材質分離)를 위한 마찰하전형(摩擦荷電形) 정전선별(靜電選別) 기술개발(技術開發))

  • Jeon, Ho-Seok;Park, Chul-Hyun;Baek, Sang-Ho;Kim, Byoung-Gon;Kim, Hyung-Seok
    • Resources Recycling
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    • v.18 no.1
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    • pp.13-21
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    • 2009
  • A research on material separation of EVA and PET mixture plastic waste using a triboelectrostatic separator has been carried out. It was found that PP was the best charging material to give the highest charge on the surface of EVA and PET mixture plastics with an opposite polarity. Therefore, a charger of pipe line type using PP material was manufactured for separation of EVA and PET mixture plastic waste. At optimum test conditions that used PP cyclone charger developed in this study, we could separate out PET with a glade of 98.7% and a recovery of 89.7%.

Development of Triboelectrostatic Separation Technique for Material Separation of ABS and PS Mixed Plastic Waste (ABS와 PS 혼합(混合) 폐플라스틱 재질분리(材質分利)를 위한 마찰하전형정전선별(摩擦荷電型靜電選別) 기술개발(技術開發))

  • Lee, Eun-Seon;Baek, Sang-Ho;Kim, Su-Kang;Choi, Woo-Zin;Chin, Ho-Ill;Jeon, Ho-Seok
    • Resources Recycling
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    • v.22 no.6
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    • pp.33-40
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    • 2013
  • Due to the environmental problem caused by plastics largely used in various fields, the importance of recycling is being emphasized. A research on material separation of ABS and PS mixed plastic waste, using a triboelectrostatic separator, was carried out for recovery the ABS. As a results of research on charging characteristic for choosing charging material, it was confirmed that ABS was optimum charging material for a tribo-charger in the material separation of ABS and PS. In the material separation using ABS charger, ABS grade of 99.5% and recovery of 92.5% were achieved at 20 kV, splitter position +2 cm from the center and 30% relative humidity. Therefore, material separation technique for recycling ABS and PS mixed plastic waste was established.