http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
산업폐기물의 가속 탄산화법을 이용한 CO2 고용화 및 중금속 안정화 특성 연구
정성명 ( Seong Myung Jung ),남성영 ( Seong Young Nam ),엄남일 ( Nam Il Um ),서주범 ( Joo Beom Seo ),유광석 ( Kwang Suk Yoo ),엄태인 ( Tae In Ohm ),안지환 ( Ji Whan Ahn ) 한국광물학회 2013 광물과산업 Vol.26 No.-
In this study, an accelerated carbonation process was applied to stabilize hazardous heavy metals of industrial solid waste incineration (ISWI) bottom ash and fly ash, and to reduce CO2 emissions. The most commonly used method to stabilize heavy metals is accelerated carbonation using a high water-to-solid ratio including oxidation and carbonation reactions as well as neutralization of the pH, dissolution, and precipitation and sorption. This process has been recognized as having a significant effect on the leaching of heavy metals in alkaline materials such as ISWI ash. The accelerated carbonation process with CO2 absorption was investigated to confirm the leaching behavior of heavy metals contained in ISWI ash including fly and bottom ash. Only the temperature of the chamber at atmospheric pressure was varied and the CO2 concentration was kept constant at 99% while the water-to-solid ratio (L/S) was set at 0.3 and 3.0 dm3/kg. In the result, the concentration of leached heavy metals and pH value decreased with increasing carbonation reaction time whereas the bottom ash showed no effect. The mechanism of heavy metal-stabilization is supported by two findings during the carbonation reaction. First, the carbonation reaction is sufficient to decrease the pH and to form an insoluble heavy metal-material that contributes to a reduction of the leaching. Second, the adsorbent compound in the bottom ash controls the leaching of heavy metals; the calcite formed by the carbonation reaction has high affinity of heavy metals. In addition, approximately 5 kg/ton and 27 kg/ton CO2 were sequestrated in ISWI bottom ash and fly ash after the carbonation reaction, respectively.
엄태인(Tae-In Ohm),이금배(Kum-Bea Lee),장동순(Dong-Soon Jang) 한국전산유체공학회 1996 한국전산유체공학회 학술대회논문집 Vol.1996 No.-
A numerical study is performed using the PIIOENICS CODE and compared against experimental results to analyze the flow field of the model to a scale of 1:10 prototype municipal waste incinerator for 300 ton/day. The key computational parameters considered are injection angle of secondary airs above grate and ratio of the primary and the secondary air of the stoker incinerator. A control-volume based finite-diffcrence method is used together with the power-law scheme for the interpolation of control volume interface. The pressure-velocity coupling in momentum equations is resolved by the SIMPLEC algorithm. Further, the standard two-equation k- ε turbulence model is employed for the Reynolds stress together with the proper turbulent Prandtl/Schmidt number assumption for the heat and mass transfer.<br/> The calculated results agree well qualitatively with the experimental data especially in the major flow patterns, say the velocity vector field and the characteristics of the recirculation zone for prototype incinerator.<br/> Based on the parametric numerical calculation, the following useful results can be drawn : The position and size of the recirculation zone can be varied according to the change of injection angle for the secondary air nozzles. Further, the recirculation zone in the secondary combustion chamber is disappeared when the air ratio of the primary and the secondary is increased 63%:35% to 80%:20%.<br/> Finally, the effect of the secondary air on the flow field of the regioo of the afterburner is confirmed through the variation of the velocity air temperature of two secondary nozzle B & C.
신미수(Mi Soo Shin),김혜숙(Hey Suk Kim),김병갑(Byeong Gap Kim),황민정(Min Jeong Hwang),장동순(Dong Soon Jang),엄태인(Tae In Ohm) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.4
유중 건조 공정의 기본 원리는 수분과 비열차이가 있는 오일을 가열할 때 온도 차이에 따라 형성되는 슬러지 내부의 급격한 압력 변화를 이용한다. 즉 슬러지 내부에 발생하는 급격한 압력 상승이 이루어질 때 슬러지 공극을 통하여 수분이 빠르게 배출하도록 하는 것이다. 본 연구의 목적은 유중 건조공정 중 다양한 운전 변수가 건조효율에 미치는 영향을 구체적으로 규명하기 위한 것이다. 변수 연구를 위하여 일련의 건조 실험과 수치해석을 시도하였으며 그 결과 건조온도, 건조시간, 폐오일종류, 슬러지 종류 등 중요 실험변수에 따른 건조곡선이 얻어졌다. 건조 온도 변화에 따른 연구 결과는 폐오일의 종류에 관계없이 140℃ 이상으로 운전하는 것이 건조효율에 유리한 것으로 나타났으며 이 결과는 수치 해석적 결과로도 확인되었다. 그리고 슬러지 직경의 경우 직경이 감소할수록 효율적으로 건조되는 경향으로 보였으며 이는 비표면적의 증가에 기인하는 것으로 판단되었다. 오일 종류나 물성의 변화에 대한 연구에서는 오일의 점도가 가시적인 영향을 주는 것으로 나타났다. 특히 점도가 높은 오일의 경우 건조 초반에 수분 증발이 현저히 지체되는 현상이 나타났다. 그러나 건조온도 140℃ 이상에서는 이러한 지체 현상이 감소하는 결과를 나타내었다. 슬러지 종류에 따른 연구에서는 전체적으로 큰 차이를 나타내지는 않았으나 하수슬러지가 다른 종류의 슬러지에 비하여 좀 더 가시적으로 양호한 수분제거 양상을 나타내었다. 수치 해석적 연구는 실험적 연구에 대한 상호보완적인 연구로서 가능성을 보였으나 복잡한 세부모델에 대한 경험적인 모델개발의 필요성이 제기되었다. The basic principle of fry drying process of sludge lies in the rapid pressure change of sludge material caused by the change of temperature between oil and moisture due to the difference of specific heat. Therefore, the rapid increase of pressure in drying sludge induces the efficient moisture escape through sludge pores toward heating oil media. The object of this study is to carry out a systematic investigation of the influence of various parameters associated with the sludge fry drying processes on the drying efficiency. To this end, a series of parametric experimental investigation has been made together with the numerical calculation in order to obtain typical drying curves as function of important parameters such as drying temperature, sludge diameter, oil type and sludge type. In the aspect of frying temperature, especially it is found that the operation higher than 140℃ was favorable in drying efficiency regardless of type of waste oil employed in this study. The same result was also noted consistently in the investigation of numerical calculation, that is, in that the sludge particle drying was efficiently made over 140℃ irrespective of the change of particle diameter. As expected, in general, the decrease of diameter in sludge was found efficient both experiment and numerical calculation in drying due to the increased surface area per unit volume. In the investigation of oil type and property, the effect of the viscosity of waste oil was found to be more influential in drying performance. In particular, when the oil with high viscosity, a visible time delay was noticed in moisture evaporation especially in the early stage of drying. However, the effect of high viscosity decreased significantly over the temperature of 140℃. There was no visible difference observed in the study of sludge type but the sewage sludge with a slightly better efficiency. The numerical study is considered to be a quite useful tool to assist in experiment with more detailed empirical modeling as further work.
엄태인(Tae-In Ohm),채종성(Jong-Seong Chae),김정규(Jung-Ku Kim),최수아(Soo-A Choi),오세천(Sea-Cheon Oh) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
In this study, we carried out torrefaction experiment using PKS(Palm Kernel Shell), and Bagasse as a raw material of oversee of herbaceous biomass and using waste wood and logging residue as a raw material of domestic of woody biomass. And then, by analyzing the physical & chemical properties, we investigated the characteristics as a fuel. By using the result of thermo gravimetric analysis, the biomass residue was torrefied for 30 minutes at a temperature range of 250-350℃ in anaerobic condition. As a result, torrefied materials of moisture content are lower than raw , but of fixed carbon, calorific value and ash are higher than raw.
흑색 황산3가크롬을 이용한 태양열 흡열판 선택흡수막 도금기술
엄태인(Ohm Tae-In),여운택(Yeo Woon-Tack),김동찬(Kim Dong-Chan) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.3
One of the most important factors that have a large influence on performance of the solar water heater system is performance of the solar collector, more detailedly, coating technology on the surface of the solar collector, which can provide high solar absorptance and low emittance. The core of the coating technology is to coat solar selective surfaces. In this study, various performance experiments are carried out using Cr₂(SO₄)₃・15H₂O coating technology. Here, IGBT(Insulated Gate Bipolar Transistor) of 5000A-15V was used as the surface processing rectifier which can stably output power and also can control voltage and current. The plating solution mainly contains black chrome<SUP>+3</SUP> concentration, H-y Conductivity, N-u Complex, NF Additive and NC-2 Wetter. Before applying the black chrome coating on the copper plate, optimal conditions are provided by using various preprocessing methods such as removal of fat, activation, electrolytic polishing, nickel strike, copper sulfate plating and bright neckel plating, and then the automatic continuous coating experiment are performed according to plating time and cathode current density. In the experiment, after the removal of fat, chemical polishing, nickel strike and activation processes as the preprocessing methods, the black chrome coating was performed in a plate solution temperature of 28℃ and a cathode current density of 18A/㎠ for 90seconds. The thickness of chrome and nickel on the coated plate is 0.389㎛, 159㎛ respectively. As a result of the coating experiment, it showed the most excellent performance having a high solar absorptance of 98% and a low emittance of 5±1% when the black chrome surface had a thickness of 0.398㎛.