• Title/Summary/Keyword: Separation System

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A Study of Interpretation of Separation Behavior in Gas Expansion Separation(GES) Bolt (가스팽창분리형 볼트 분리거동 해석 연구)

  • Lee Young Jo
    • Journal of the Korean Society of Propulsion Engineers
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    • v.9 no.1
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    • pp.27-34
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    • 2005
  • The present work has been developed the study of interpretation of separation behavior in gas expansion separation(GES) bolt which has the separation characteristics without fragmentation and minimum pyre-shock during the operation of the explosive bolt. In order to obtain the performance of minimum pyre-shock, the present work used non-compressive material instead of separation explosives. The use of the interpretation processor could be extensively helped to design the shape and the amount of explosives in the explosive bolt having complex geometry, and to analyse the separation behavior during the operation. It is also proved that the GES bolt is the most suitable the separation system necessary to minimum pyre-shock and non fragmentation compare with others.

Triboelectrostatic Separation System for Separation of PVC and PS Materials Using Fluidized Bed Tribocharger

  • Lee, Jae-Keun;Shin, Jin-Hyouk;Hwang, Yoo-Jin
    • Journal of Mechanical Science and Technology
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    • v.16 no.10
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    • pp.1336-1345
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    • 2002
  • A triboelectrostatic separation system using a fluidized bed tribocharger for the removal of PVC material in the mixture of PVC/PS plastics is designed and evaluated as a function of electric field strength, air flow rate, and the mixing ratio of two-component mixed plastics. It consists of a fluidized-bed tribocharger, a separation chamber, a collection chamber and a controller. PVC and PS particles can be imparted negative and positive surface charges, respectively, due to the difference in the work function values of plastics suspended in the fluidized-bed tribocharger, and can be separated by passing them through an external electric field. Experimental results show that separation efficiency is strongly dependent on the electric Deld strength and particle mixing ratio. In the optimum conditions of 150 Ipm air flow rate and 2.6 kV/cm electric field strength a highly concentrated PVC (99.1%) can be recovered with a yield of more than 99.2% from the mixture of PVC and PS materials for a single stage of processing.

Development of Analysis Program for Geographical Separation of Radio Navigation Aids (항행안전무선시설의 지리적분리간격 분석 프로그램 개발)

  • Choi, Jae-Myeong
    • Journal of Advanced Navigation Technology
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    • v.21 no.1
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    • pp.30-35
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    • 2017
  • Radio navigation aids are very important elements to provide information necessary for safe navigation using radio waves. Recently, the number of radio equipment using radio waves is increasing, and the air frequency interference by adjacent channels is very high. In addition, the use of irregular jamming that threatening radio navigation aids and satellite navigation system frequency is rapidly increasing. Therefore, it is urgent to ensure the safety of air waves. In this paper, we investigated the characteristics and frequency of the domestic navigation system. And we were analyzed the geographical separation standard for implementation of analysis program. Also, we implemented a program for the geographical separation distance analysis that applying international standards and recommended practices.

Separation of Burnup Monitors in Spent Nuclear Fuel Samples by Liquid Chromatography

  • Joe, Kih-Soo;Jeon, Young-Shin;Kim, Jung-Suck;Han, Sun-Ho;Kim, Jong-Gu;Kim, Won-Ho
    • Bulletin of the Korean Chemical Society
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    • v.26 no.4
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    • pp.569-574
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    • 2005
  • A coupled column liquid chromatography system was applied for the separation of the burnup monitors in spent nuclear fuel sample solutions. A reversed phase column was studied for the adsorption behavior of uranyl ions using alpha-hydroxyisobutyric acid as an eluent and used for the separation of plutonium and uranium. A cation exchange column prepared by coating 1-eicosylsulfate onto the reversed phase column was used for the separation of the lanthanides. In addition, retention of Np was checked with the reversed phase column and cation exchange column, respectively, according to the oxidation states to observe the interference effect for the separation of burnup monitors. This chromatography system showed a great reduction in separation time compared to a conventional anion exchange method. A good agreement from the burnup data was obtained between for this method and a conventional anion exchange method to within 1% of a difference for the spent nuclear fuel samples of about 40 GWD/MTU.

Outline and Performance Evaluation of High Quality Recycled Fine Aggregate Manufacturing System Using Drying Gravity Separation Method (건식비중분리법에 의한 고품질순환잔골재생산시스템의 개요 및 성능평가)

  • Kim Moo-Han;Kim Gyu-Yong;Choi Kyongl-Yeul;Lee Do-Heun;Song Ha-Young;Roh Kyung-Min
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.05a
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    • pp.111-114
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    • 2006
  • Recently, it is increased on the concern for the reuse of waste concrete because of the shortage of natural aggregate and the increase of waste concrete. And recycled coarse aggregate is used variously, but the existing wet method producted recycled fine aggregate has problem like the high price facilities, the long time progress of the work and the poor of recycled fine aggregate. The aim of this study is to investigate outline and performance evaluation of the drying specific gravity separation method to product high duality recycled fine aggregate. Finally, this study is shown investigate process flowing of drying separation type with gravity manufacture, producte system and function of detail devices. The performance of the method of drying specific gravity separation is certificated as the qualities of recycled fine aggregate satisfied the KS

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Separation Performance of a Low-pressure Hydrocyclone for Suspended Solids in a Recirculating Aquaculture System

  • Lee, Jin-Hwan
    • Fisheries and Aquatic Sciences
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    • v.13 no.2
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    • pp.150-156
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    • 2010
  • The separation performance of a low-pressure hydrocyclone (LPH) was evaluated for suspended-solids removal in a recirculating aquaculture system (RAS). The dimensions of the LPH were 335 mm cylinder diameter, 575 mm cylinder height, 60 mm overflow diameter, 50 mm underflow diameter, and $68^{\circ}$ cone angle. The inflow rate varied (400, 600, 800, and 1,000 mL $s^{-1}$) with 25%, 25%, 20%, and 10% of bypass ($R_f$), respectively. The maximum total separation efficiency (Et) and reduced separation efficiency (E't) for suspended solids from the effluent of the second settlement tank (before biofiltration) were 58.9% and 45.2%, respectively, at an inflow rate of 600 mL $s^{-1}$ and 25% of $R_f$. The maximum Et and E't for suspended solids from the water supply channel (after biofiltration) were 24.4% and 16%, respectively, at an inflow rate of 1,000 mL $s^{-1}$ and 10% of $R_f$. The maximum grade efficiency (Ei) was 51.6% for a 300 ${\mu}m$ particle size at an inflow rate of 600 mL $s^{-1}$ with 23% of $R_f$. The maximum reduced grade efficiency (E'i) was 37.6% for a 300 ${\mu}m$ particle size at an inflow rate of 1,000 mL $s^{-1}$ with 11% of $R_f$. The results indicate that the separation performance of the LPH for suspended solids removal was size selective and that maximum removal occurred at particle sizes ranging from 300 to 500 ${\mu}m$.

An Experimental Study on Flow control around Foil with Coanda effect (콴다효과를 이용한 익 주위의 유동제어에 관한 실험적 연구)

  • Oh, Kyoung-Gun;Cho, Dae-Hwan;Lee, Gyoung-Woo;Ko, Jae-Yong
    • Proceedings of KOSOMES biannual meeting
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    • 2006.11a
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    • pp.65-69
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    • 2006
  • The flow around a foil with water jet was investigated using the two-frame PIV(CACTUS 3.1) system. After separation, unsteady recirculation & reattachment region was shown a result at reading edge. Separation area was decreased to 1/3 more by waterjet system with coanda effect. Angle of attack and water jet velocity was a variable in the experiment. Each parameters was controlled to $0^{\circ}\sim35^{\circ}$ and $0[m/s]\sim9.2[m/s]$. The separation of flow appearanced at first when the angle of attack is $17^{\circ}\sim18^{\circ}$, However, according to grew up of velocity, beginning of the separation was delayed. In this experiment, vortex and separation region was disappeared by blown when each parameters are low level, and separation controlled more certainly.

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Nitrogen-Oxygen Separation Characteristics by Polyimide Membrane System for Controlled Atmosphere Storage (CA저장을 위한 폴리이미드 막 시스템의 질소-산소 분리특성)

  • 이호원;현명택;고정삼
    • Food Science and Preservation
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    • v.5 no.3
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    • pp.239-246
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    • 1998
  • Polyimide membrane system was designed for manufacturing nitrogen-enriched gas, and basic technical data was suggested for appling this system to controlled atmosphere storage. The permeability characteristics of pure oxygen and nitrogen could be explained by dual-mode sorption model. There was substantial decrease in the permeation rates of oxygen, which is the more permeable gas, through the polyimide membrane due to the presence of nitrogen in comparison with pure oxygen. However, the permeation rates of nitrogen was increased by the presence of oxygen. The ideal separation factor was in the range of 5 to 6 in the range of temperature and pressure difference studied, and the separation factor of air was lower than the ideal separation factor. The increase of ideal separation factor with increasing temperature is due to the fact that the activation energy for oxygen is larger than that for nitrogen. Nitrogen concentration decreased rapidly with increasing product recovery, and it was found that this is a major operating factor to obtain nitrogen concentration required for controlled atmosphere storage. A relation equation, by which nitrogen concentration in storehouse can be predicted, was suggested under the establishment of a hypothetical model for controlled atmosphere storage process using polyimide membrane system.

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A Numerical Analysis of Direct Contact Membrane Distillation for Hollow Fiber Membrane (기체분리용 고분자 멤브레인의 최근 개발 동향)

  • Kim, Tae-Heon;Jeong, Jung-Chae;Park, Jong-Man;Woo, Chang-Hwa
    • Membrane Journal
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    • v.20 no.4
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    • pp.267-277
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    • 2010
  • Gas separation membranes have been developed for decades in various areas to replace the conventional processes. Membrane processes for gas separation have many advantages of energy saving, compact size, and easy scale-up. Nowadays, gas separation processes is widely spreaded in nitrogen generating system, hydrogen generating system, membrane dryer, on board inert gas generating system, natural gas purification, biogas purification and fuel cells. Carbon dioxide separation process using membrane would be a strong candidate of carbon dioxide capturing process. In order to broaden the scope of application of gas separation membranes, development of new materials which can overcome the borderline of Robeson's plot should be necessary, so that many researchers and companies are trying to develop the new materials like polymers containing cardo and spiro group and PIMs (polymers for intrinsic microporosity).

A Study of PIV Analysis around 2-Dimensional Foil with Blowing (물분사장치를 이용한 2차원 익 주위의 PIV 해석에 관한 연구)

  • Oh, Kyoung-Gun;Cho, Dae-Hwan;Lee, Gyoung-Woo;Ko, Jae-Yong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.1
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    • pp.45-49
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    • 2006
  • The flow around a foil with waterjet was investigated using the two-frame PIV(CACTUS 3.1) system. After separation, unsteady recirculation & reattachment region was shown as a result at reading edge. Separation area was decreased to 1/3 more by waterjet system with coanda effect. Angle of attack and waterjet velocity was a variable in the experiment. Each parameters was controlled to $0^{\circ}{\sim}35^{\circ}$ and 0[m/s]${\sim}$9.2[m/s]. The separation of flow appearanced at first when the angle of attack is $17^{\circ}{\sim}18^{\circ}$. However, according to grew up of velocity, beginning of the separation was delayed. In this experiment, vortex and separation region was disappeared by blown when each parameters are low level, and separation controlled more certainly.

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