http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
기포부상 분리법을 이용한 Cr(Vl) 제거에 있어서의 단위조작적 해석과 동특성 연구
변동환,이승무,이수구 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.1
This investigation was carried out to study the removal of Cr(VI) from the wastewater by using cethyl ethyl dimethyl ammonium bromide (CEDA-Br) as a foaming agent in the ionic flotation process. To study the dynamic characteristics in this system, the bubble diameter and gas holdup were measured by the photographic and conventional methods and the surface excess concentrations of CEDA-Br and Cr(VI) were determined. Also the removal ratio was studied with changing the operating parameters. The adsorption rate equation of Cr(VI) was derived by using the ratio of surface excess concentrations of CEDA-Br and Cr(VI). And the dynamic equation on the liquid pool of bubble column was derived with mathematical assumptions from model building. The removal ration of Cr(VI) was proportional to the concentration of CEDA-Br in the feed solution and logarithmically to the air flow rate. In the double column system, the removal ratio of Cr(VI) could be increased to 92%.
변영복,구태근,김은수,조기연,김동희,변동환 한국조명전기설비학회 2001 조명·전기설비학회논문지 Vol.15 No.5
Most of the battery charger for electric powered forklift truck are controlled by the method of 3-phased constant current and constant voltage controls. However, these chargers have several disadvantages like a large charger capacity, and a short battery life time. To eliminate the weak points, a digital type battery charger based on multi-mode control adding a constant power control and several assistant controls in the conventional control is presented. The whole control system is performed by a low cost 8 bit one-chip micro-controller and completely digitize. So, we can get a high precision control and a good reliability. 현재 대부분의 전동지게차 충전기는 3상의 일정전류제어와 일정전압제어 방식으로 운전되고 있으며, 이러한 충전방식은 충전기의 이용률을 저하시킬 뿐 아니라 축전지의 수명을 단축시키는 등의 단점을 가지고 있다. 이러한 문제점을 보완하기 위해서, 본 논문에서는 기존의 방식에서 일정전력제어 및 부가적인 제어모드를 첨가한 다중제어 충전방식을 제시하였다. 전체 제어시스템은 저가의 micro-controller를 적용하여 디지털화 시킴으로써 제어정도 및 신뢰성을 향상시켰으며, 제어장치의 소형화와 함께 저 가격화를 실현하였다.
변영복(Y.B.Byun),구태근(T.G.Koo),김은수(E.S.Kim),조기연(K.Y.Joe),김동희(D.H.Kim),변동환(D.H.Byun) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
Most of the battery charger for electric powered forklift truck are controlled by the method of 3-phased constant current and constant voltage. However, these chargers have several disadvantages like a large charger capacity, and a short battery life time.<br/> This paper presents a digital type battery charger based on multi-mode control adding a constant power control and several assistant controls in the conventional control. The whole control system is performed by a low cost one-chip micro-controller and completely digitize. So we can get a high precision control and a good reliability.<br/>