http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
분체공학 유동층 재료 ( 무기 , 유기 , 고분자 ) / 기류 수송계에서 자성 및 비자성 미분체의 연속적 자성분리
여평모(Pyong Mo Yeo),김용하(Yong Ha Kim),김행구(Hang Goo Kim) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.5
Based on the differences in the magnetic susceptibility of materials, a down-flowing electromagnetic bed were investigated for the separation between magnetic and non-magnetic fine powders in a pneumatic conveying system. A new feeder which utilizes local fluidization and vibration was developed for conveying powders to the electromagnetic bed. The performance of the feeder has been evaluated using pulverized coal of which average diameter is 52 ㎛ and sieved coals which were classified by size. Local fluidization and vibration were found to be effective to minimize interparticle adhesion forces. As the .gas velocity for local fluidization increased, the discharging rate increased only slightly when the gas velocity is below a critical value with respect to particle size, but increased sharply when it is above the critical value. The discharging rate increased with the increases in particle size, vibrating acceleration and gas velocity for local fluidization. In the test for electromagnetic separation, grinding dust(G/D) and shot dust were used as magnetic fine powders and pulverized coal and sand as non-magnetic ones. Down-flowing annulus separator was found to be effective for continuous removal and recovery of magnetic and non-magnetic fine powders in a pneumatic conveying system. In the continuous operation, the formation of magnetic chains in the core could be minimized by shortening on/off intervals of electromagnetic sets. As the magnetic field intensity, the opening ratio in the core and the magnetic susceptibility increased, the removal efficiency of magnetic fine powders increased while the recovery efficiency of non-magnetic fine powders decreased due to interparticle adhesion forces.
자성 유체분리에 의한 양어장 순환수내 부유 고형물의 제거
김용하,여평모,서근학,김행구,정우창,김순호,KIM Yong-Ha,YEO Ryoung-Mo,SUH Kuen-Hack,KIM Hang-Goo,CHUNG Uoo-Chang,KIM Soon-Ho 한국수산과학회 1999 한국수산과학회지 Vol.32 No.5
자성 미분체와 부유 고형물사이에 작용하는 응집력에 의해 부유 고형물의 표면에 다수의 자성 미분체가 부착된 형태의 자성 플럭을 형성하고 이들을 자력 분리하는 방식의 자성 유체분리 기술이 양어장 순환수내 부유 고형물의 제거에 적용 가능함을 확인하였다. 자성 유체분리에 의한 순환수내 부유 고형물의 제거에 있어서 조업변수인 자석의 세기, 공탑 액체유속, 마그네타이트/부유 고형물의 질량비, 그리고 부유 고형물의 농도의 영향 평가에서는, 1. 자성 유체분리에 의한 부유 고형물의 제거에서는 사용하는 자석의 세기가 부유 고형물의 제거효율은 물론 설비의 처리 용량을 결정하는데 지배적임을 확인하였으며, 2. 공탑 액체유속의 증가, 즉 유체력의 상승에 따른 제거효율의 저하는 마그네타이트/부유 고형물의 질량비가 증가, 즉 자성 플럭자체의 자화력이 보다 강하게 작용하면서 감소하였다. 본 실험조건에서는 공탑 액체유속과 자성 미분체의 투입량, 그리고 처리수내 부유 고형물의 농도 등을 고려시 마그네타이트/부유 고형물의 적정 질량비는 약 1.0 임을 알 수 있었다. A magnetic fluid separation technology was confirmed to be very effective to remove the suspended solids (SS) from aquacultural recirculating water, In this study, the effects of operating variables on the characteristics of SS removal were investigated through the test runs using magnetite of 2 $\mu$m mean diameter as magnetic powder. Magnetic flocculation here formed by adsorbing fine magnetites on the surface of suspended solid was observed. The strength of magnet was of significance in determining the SS removal efficiency as well as the capacity of the equipment. In addition, the SS removal efficiency decreased with an increase in the superficial liquid velocity, but the effect became negligible when the mass ratio of magnetite to the suspended solids was higher than 1.0.
생물화공 에너지 / 환경 / 자성 유체분리에 의한 오수의 고도처리
김용하(Yong Ha Kim),여평모(Pyong Mo Yeo),신수희(Su Hee Shin),서근학(Keun Hack Suh),김행구(Hang Goo Kim),오창섭(Chang Sup Oh) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.5
A magnetic fluid separation is applied to the advanced treatment of sewage for removing the suspended solids which discharged as being entrained in the effluent from the final settling pond. In this study, the correlation with the concentration of suspended solids in the sewage and COD, with the solid concentration and turbidity, and the effects of operating parameters on the removal of the pollutant materials from the sewage were investigated. It is expected that COD and turbidity in sewage can be reduced by the removal of suspended solids in the sewage. And in result, turbidity was most strongly affected by the removal, and followed by ICOD and TCOD. In the present study, the concentration of suspended solids, TCOD and turbidity could be kept below 20 g/㎥, 60 g/㎥ and 16 NTU, respectively. The feasibility, therefore, of the magnetic fluid separation as an attractive technology for the advanced treatment of sewage was verified. However a special treatment for the extra reduction of TCOD in the clarified sewage is necessary.