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박병흥 한국방사성폐기물학회 2014 방사성폐기물학회지 Vol.12 No.3
파이로 공정은 사용후핵연료 관리 이슈 해결과 유용자원 재활용 제고의 목적으로 개발되고 있다. 파이로 공정 중 전해환원공정은 LiCl을 전해질로 사용하여 산화물을 금속으로 전환시키는 공정으로 금속 전환체에 잔류염이 포함되므로 후속 공정이요구된다. 진공 증류 공정은 다양한 용융염계에서 적용되어 왔으며 금속 전환체에서도 활용될 수 있다. 전해환원 금속 전환체 잔류염은 LiCl과 알카리 및 알카리토 금속 염화물을 포함한다. 본 연구에서는 이들 염화물들의 증기압을 추산하여 진공 증류 공정에서 잔류 액체의 조성변화를 계산하였다. 증류된 기체가 일정하게 제거되는 조건에서 물질수지와 기-액 평형식을 결합한 모델을 개발하였으며 증기압을 이용하여 무차원 시간에 대한 액체 조성 변화를 계산하였다. 공정 조건 변화 모사를 위해 온도와 용융염 조성을 변화시켜 거동을 비교하였다. 잔류염의 증류는 주성분인 LiCl에 의해 지배되었으며 LiCl 보다 증기압이 높은 CsCl은 쉽게 제거될 것이 예상되었다. 증기압이 유사한 RbCl은 LiCl과 일정한 조성이 유지되었다. 반면 증기압이낮은 SrCl2와 BaCl2는 시간에 따라 농축되며 초기 조성이 높은 경우 증류 과정에서 석출될 가능성이 있는 것으로 예상되었다. Pyroprocessing has been developed for the purpose of resolving the current spent nuclear fuel management issue and enhancingthe recycle of valuable resources. An electrolytic reduction of the pyroprocessing is a process to reduce oxides intometals using LiCl as an electrolyte and requires a post-treatment process due to the inclusion of residual salt in porous metalproducts. A vacuum distillation has been adopted for various molten salt systems and could be applied to the post-treatmentprocess of the electrolytic reduction. The residual salt in the metal products includes LiCl, alkali chlorides, and alkalineearth chlorides. In this paper, vapor pressures of chlorides have been estimated and the composition changes on the residualliquid during the vacuum distillation process have been calculated. A model combining a material balance and vapor-liquidequilibrium relations has been proposed under a constant vapor discharging flow rate and liquid composition changes havebeen calculated using the vapor pressures with respect to a dimensionless time. The behaviors have been compared withtemperature and molten salt composition changes to simulate the process condition variation. The distillation of the residualsalt has been dominated by LiCl which is the main component of the salt and CsCl of which vapor pressure is higher thanthat of LiCl would be readily removed. RbCl exhibits similar vapor pressure with LiCl and maintains its composition. However,SrCl2 and BaCl2 of which vapor pressures are much lower than that of LiCl are concentrated with time and expectedto be possibly precipitated during the distillation when the initial compositions are increased.
박병흥,김기섭,Park, Byung Heung,Kim, Ki-Sub 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1
Spent fuels are discharged from nuclear reactors as a result of power generations. The spent fuels would be considered as a useful resources because the main constituent is uranium and some other actinides are included in them. In order to utilize the resources chemical processes should be developed to treat the spent fuels and obtain uranium and other actinides to be fueled in a fast reactor. The technologies are categorized into wet and dry processes. In this study, the current status of such technologies is summarized to give a insight and a deep understanding on nuclear fuel cycles.
구형 연마재에 의한 표면 연마에 관한 분자동역학 시뮬레이션 연구
박병흥,강정원 한국반도체디스플레이기술학회 2011 반도체디스플레이기술학회지 Vol.10 No.4
We investigated the substrate surface polishing by the spherical rigid abrasive under the compression using classical molecular dynamics modeling. We performed three-dimensional molecular dynamic simulations using the Morse potential functions for the various slide-to-roll ratios, from 0 to 1, and then, the compressive forces acting on the spherical rigid abrasive were calculated as functions of the time and the slide-to-roll ratio. The friction coefficients obtained from the classical molecular dynamics simulations were compared to those obtained from the experiments; and found that the molecular dynamic simulation results with the slide-to-roll ratio of 0 value were in good agreement with the experimental results.
상태방정식을 이용한 고압수소 저장을 위한 수소 열역학 물성 계산 및 비교
박병흥 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.2
One of the technical methods to increase the volumetric energy density of hydrogen is to pressurize the gaseous hydrogen and then contain it in a rigid vessel. Especially for automotive systems, the compressed hydrogen storage can be found in cars as well as at refueling stations. During the charging the pressurized hydrogen into a vessel, the temperature increases with the amount of stored hydrogen in the vessel. The temperature of the vessel should be controlled to be less than a limitation for ensure stability of material. Therefore, the accurate estimation of temperature is of significance for safely storing the hydrogen. In this work, three well-known cubic equations of state (EOSs) were adopted to examine the accuracy in regenerating thermodynamic properties of hydrogen within the temperature and pressure ranges for the compressed hydrogen storage. The formulations representing molar volume, internal energy, enthalpy, and entropy were derived for Redlich-Kwong (RK), Soave-Redlioch-Kwong (SRK), and Peng-Robinson (PR) EOSs. The calculated results using the EOSs were compared with literature data given by NIST. It was revealed that the accuracies of RK and SRK EOSs were satisfactorily compatible and better than the results by PR EOS.