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송평섭,강용,우광재,정의영 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
Hydrodynamic characteristics of gas-solid flow has been analyzed by adopting the static pressure drop method in circulating fluidized beds. Pressure drop has been measured in the test section of the riser(0.1m IDx3.5m Height). The dried and filtered air was injected into the column through the perforated type distributor. Polyetylene powder whose density is 920 kg/㎥ and mean diameter is 454 ㎛ was used as a solid phase. The pressure drop slightly increased in the turbulent fluidized regime and rapidly decreased because of decreasing of solid hold-up in the fast fluidization regime with increasing superficial gas velocity. The slip velocity that is relative velocity between gas and solid velocity increased in the turbulent fluidized regime and decreased in the fast fluidized regime with increasing the superficial gas velocity.
Characteristics of the Decontamination by the Melting of Aluminum Waste
Pyung-Seob Song,Wang-Kyu Choi,Byung-Youn Min,Hak-I Kim,Chong-Hun Jung,Won-Zin Oh 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.2
TRIGA 연구로의 해체 시 발생하는 금속성 폐기물의 용융기술을 확립하기 위한 기초연구로 전기로 내에서 방사성 핵종(Co, Cs, Sr)을 포함한 알루미늄의 용융 시 용융온도, 용융시간 및 플럭스(flux)의 종류가 핵종의 분배 거동에 미치는 영향을 조사하였다. 플럭스의 종류에 따라 다소 차이는 있으나, 플럭스의 첨가로 알루미늄 용융체의 유동성이 증가됨을 확인할 수 있었다 용융 후주괴(ingot) 및 슬래그(slag) 시료의 XRD분석을 통해 핵종이 주괴에서 슬래그 상으로 이동하고 슬래그를 구성하고 있는 산화알루미늄과 결합하여 안정한 화합물을 형성함을 알 수 있었다. 슬래그의 발생량은 용융온도와 용융시간이 증가할수록 증가하는 경향을 보였으며, 증가속도는 플럭스의 종류에 따라 차이를 보였다. 핵종 중 Co는 용융온도가 증가함에 따라 주괴 내 에서는 감소하였으나 슬래그 상에서는 증가하는 경향을 보였으며, 실험조건에 따라 최대 90까지 주괴에서 슬래그로 이동하였다. 휘발성이 강한 Cs과 Sr은 대부분이 슬래그와 분진으로 이동하여 매우 높은 제염계수를 얻을 수 있었다. Effects of the aluminum melting temperature, melting time and a kind of flux agents on the distribution of surrogate nuclide were investigated in the electric furnace at the aluminum melting including surrogate radionuclides(Co, Cs, Sr) in order to establish the fundamental research of the melting technology for the metallic wastes from the decommissioning of the TRIGA research reactor. It was verified that the fluidity of aluminum melt was increased by adding flux agent but it was slightly varied according to the sort of flux agents. The results of the XRD analysis showed that the surrogate nuclides move into the slag phase and then they were combined with aluminum oxide to form more stable compound. The weight of the slag generated from aluminum melting test increased with increasing melting temperature and melting time and the increase rate of the slag depended on the kind of flux agents added in the aluminum waste. The concentration of the cobalt in the ingot phase decreased with increasing reaction temperature but it increased in the slag phase up to 90according to the experimental conditions. The volatile nuclides such as Cs and Sr considerably transferred from the ingot phase to the slag and dust phase.
분리기술 , 열역학 : 호기성 삼상 역 유동층의 물질전달 특성
송평섭(Pyung Seob Song),강용(Yong Kang),김상돈(Sang Done Kim),김상우(Sang Woo Kim),김현태(Hyun Tae Kim) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.4
Gas holdup, axial dispersion coefficient of liquid phase and gas-liquid mass transfer characteristics have been investigated in a aerobic three-phase inverse fluidized bed whose diameter and height are 0.152m and 2.5m, respectively. Effects of gas and liquid velocities and particle density(particle kind) on the gas holdup, axial dispersion coefficient of liquid phase and volumetric gas-liquid mass transfer coefficient have been determined. Tap water, filtered compressed air and low density polypropylene particle(p_s=877.3㎏/㎥, d_p=0.004m) or polyethylene particle(p_s=966.6㎏/㎥, d_p=0.004m) have been used as a liquid, gas and fluidized solid phase, respectively. The gas holdup has been obtained from the pressure drop profiles by means of static pressure drop method, and the axial dispersion coefficient of liquid phase and volumetric gas-liquid mass transfer coefficient have been determined by means of axial dispersion model from the knowledge of axial profile of dissolved oxygen concentration. It has been found that the gas holdup, axial dispersion coefficient and volumetric gas-liquid mass transfer coefficient have increased with increasing gas and liquid velocities, but the effects of gas velocity have been dominant in aerobic three phase inverse fluidized beds. In the beds of polyethylene particle(relatively heavier particle) the values of ε_G, Dz and k_L a have exhibited higher than those in the beds of polypropylene particles(relatively lighter particle). The values of gas holdup, axial dispersion coefficient and gas-liquid mass transfer coefficient have been well correlated in terms of gas and liquid velocities and particle density.
Melting Characteristics for Radioactive Aluminum Wastes in Electric Arc Furnace
Byung-Youn Min,Pyung-Seob Song,Jun-Hyung Ahn,Wang-Kyu Choi,Chong-Hun Jung,Won-Zin Oh,Yong Kang 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.1
한국원자력연구소 내의 연구용 원자로(TRIGA II, III) 해체 시 발생한 방사성 알루미늄 해체 폐기물의 감용 및 제염 특성을 평가하기 위해 아크로에서 알루미늄의 용융 특성 및 방사성 핵종의 분배 특성에 대한 연구를 수행하였다. 알루미늄 폐기물은 흑연전극(graphite electrode)을 이용한 전기아크로에서 4가지 종류의 플럭스를 함께 첨가하여 용융시켰다. 또한 알루미늄의 용융 시 방사성 핵종의 분배 특성을 고찰하기 위해 알루미늄 시편에 방사성 모의 핵종인 코발트, 세슘, 스트론튬의 화합물을 오염시킨 후 혹연도가니에 넣어 알루미늄 용융실험을 수행하였다. 전기아크로에서 알루미늄의 용융실험을 수행한 결과 플럭스의 종류에 따라 다소 차이는 있으나 플럭스의 첨가에 의해 알루미늄 용융체의 유동성이 증가됨을 확인할 수 있었다. 아크 용융에 의해 생성된 슬래그의 발생량은 플럭스 A와 B를 첨가한 알루미늄 용융실험에 비해 플럭스 C와 D를 첨가한 실험에서 상대적으로 많은 양이 생성됨을 알 수 있었으며, 첨가된 플럭스의 양이 증가할수록 이에 비례하여 슬래그의 발생량이 증가함을 알 수 있었다. 슬래그(slag)의 XRD 분석을 통해 방사성 핵종이 주괴에서 슬래그 상으로 이동한 후 슬래그를 구성하고 있는 산화알루미늄과 결합하여 안정한 화합물로 슬래그 상에 포집됨을 알 수 있었다. 알루미늄 폐기물의 용융시 Co의 분배율은 플럭스를 첨가한 경우에 보다 높은 제염계수를 나타냈으며, 모든 플럭스에서 40% 이상의 제염 효과를 나타내었다. 반면에 휘발성 핵종인 Cs과 Sr은 주괴로부터 98% 이상이 제거되어 대부분이 슬래그상과 분진으로 이동되는 특성을 확인할 수 있었다. The characteristics of the aluminum waste melting and the distribution of the radioactive nuclides have been investigated for the estimation on the volume reduction and the decontamination of the aluminum wastes from the decommissioning of the TRIGA MARK it and III research reactors at the Korea Atomic Energy Research Institute(KAERI). The aluminum wastes were melted with the use of the fluxes such as flux , and flux in the DC graphite arc furnace. For the assessment of the distribution of the radioactive nuclides during the melting of the aluminum, the aluminum materials were contaminated by the surrogate nuclides such as cobalt(Co), cesium(Cs) and strontium(Sr). The fluidity of aluminum melt was increased with the addition of the fluxes, which has slight difference according to the type of fluxes. The formation of the slag during the aluminum melting added the flux type C and D was larger than that with the flux A and B. The rate of the slag formation linearly increased with increasing the flux concentration. The results of the XRD analysis showed that the surrogate nuclide was transferred to the slag, which can be easily separated from the melt and then they combined with aluminum oxide to form a more stable compound. The distribution ratio of cobalt in ingot to that in slag was more than 40% at all types of fluxes. Since vapor pressures of cesium and strontium were higher than those that of the host metals at the melting temperature, their removal efficiency from the ingot phase to the slag and the dust phase was by up to 98%.