유동매체에 따른 최소 유동화 속도

趙炳烈 충주대 산업과학기술연구소 2000 産業科學論文集 Vol.8 No.-

The minimum fluidizing velocity in a gas - solid fluidized bed has been analysed by using statistical method to interpret fluidized bed behavior. The experiments were carried out in a fluidizied bed of 6.7 cm - ID, and the experimental variables were three groups(Group A, Group B, Group C) of the fluidizing solid particles distinguished themselves in the fluidization by the Geldart's classification etc. The minimum fluidizing velocity is one of the most important properties in fuidization. The minimum fluidizing velocity can be measured from the average which is time invariant property among the pressure fluctuation data. As a result, the hysteresis along the increase and decrease in the gas velocity has been observed in the uniform sized Group B, but neither in Gaussian and Rosin-Rammler distribution nor in the uniform sized Group A and Group C. And also, it has been found that the standard deviation, which is a square root of second moment of the pressure fluctuations can be effectively used to predict minimum fluidizing velocity and to show the distinguishable patterns of the fluidized phenomena.

나트륨 순도관리 기술평가

조병렬 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2

The purity control of high temperature liquid sodium is very important just like that of LWR. Sodium oxide and/or hydrogen gas are easily generated by the reaction of liquid sodium with trace amount of oxygen and/or moisture leaked from the exterior. It is required to understand and acquire the removal mechanism of sodium oxides and other impurities in the coolant system for avoiding long-term shutdown caused by excessive level of impurity. Therefore, it is very important to monitor oxides concentration and remove these oxides. Accordingly, the purpose of this study provides the basic date for design and operation method sodium purification system.

표면연소모델을 이용한 풀형 화재 현상 해석

趙炳烈 충주대 2001 한국교통대학교 논문집 Vol.36 No.2

The objective of this study is to study on the characteristics of sodium pool fires.The surface combustion model(SOFIRE Ⅱ) was used, because of its simplicity, for the analysis of sodium pool fire in a containment vessel.As a result, it was turned out that this model showed the overestimation results about the combustion rate, sodium temperature and gas pressure in comparison with experimental results.

나트륨 화재 유형별 연소현상 해석

조병렬 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2

Liquid metal reactor(LMR) of the most promising energy source in the 21st century, uses liquid sodium in stead of water as a coolant, which is one of saliant features comparing with conventional PWRs. Therefore the acquisition of liquid sodium handling technology should be preceded for the LMR development and the present study on the sodium coolant safety is an essential task in the LMR research and development. As for sodium handling and safety, the technologies for protection from sodium fire should be acquired. For that reason, the characteristics of liquid sodium fire occurring when the hot sodium make a contact with the air are understood. The objective of this study is to study on the analysis of phenomena of the combustion for the type of sodium fires. The variables of experiment were the temperature, pressure and aerosol size etc. A pool fire was experimented after filling the pan with undispersed liquid sodium inside a closed test vessel. The pressure and temperature inside test vessel were measured, and the characteristics of pool fire due to the intial concentration of oxygen was analysed. For a spray fire experiment, liquid sodium was injection into the upper part of the test vessel in a dispersed state through a spray nozzle. The pressure and temperature of gas inside the test vessel was measured, and the characteristics of the spray fire due to the temperature of injected sodium was analysed.

액체폐기물 저장조 lagoon의 자연증발에 관한 연구

朴相瓚,趙炳烈 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

The objective of this study is keeping up radiation safty control from uranium material contamination. Accordingly, the check and radiation monitoring of the lagoon has been perfomed periodically. The liquid waste in lagoon will be vaporized mostly into the atomosphere by spontaneity of natural pheonmeunm after about four years.The uranium concentration in the liquid waste of lagoon reduced considerably to about 40 ppm from 2 g/l quantities of this early year due to uranium precipitation.

분산모델을 이용한 진동 공급기내에서 고체 입자 혼합특성

朴相瓚,趙炳烈 충주대 2000 한국교통대학교 논문집 Vol.35 No.2

This work has been carried out to study the mixing characteristics of solid in vibrating feeder by dispersion model.The experimental variables were particle size, particle densities, vibration amplitude and vibration frequency etc.The system consisted of two particles such that fine particles were located on the top of the coarse particles before vibratory mixing had started.It was found from this study that dispersion model can effectively explain the mixing characteristics of solid in vibrating feeder.

분무형 나트륨 연소시 온도 및 압력 특성 연구

박상찬,조병렬 충주대학교 1998 한국교통대학교 논문집 Vol.33 No.2

The high temperature liquid sodium as a coolant of liquid metal reactor is subject to be accompanied with fire in contact with the air when there is a leakage from piping and components. It is necessary to understand the characteristics of sodium fire with the various types of leakage. In connection with understanding the characteristics of sodium fire, safety technologies such as emergency measure against sodium fire, protection from fire and fire propagation, and extinguish could be reflected in design of the liquid metal reactor. It is very important to make an establishment of safety measure for sodium fire. Results of experimental data are as follows: 1) Peak gas pressure decreases significantly when the droplet diameter increases. This effect appears sharphly at high oxygen concentration. 2) Peak gas pressure increases almost linearly with initial oxygen concentration. This relationship is about 0.4 psi/O₂%. 3) Peak gas pressure is a linear function of the sodium quantity. This relationship is about 0.07 psi/gram of Na. 4) The sodium temperature exhibits no significant effect for average gas temperature and pressure.

삼중 다공판형 용매추출탑에서 분산상 체류량에 대한 연구

조병렬(Byung Real Jo),황성태(Sung Tai Hwang) 大韓環境工學會 1995 대한환경공학회지 Vol.17 No.10

분무형 나트륨 화재시 에어로졸 크기 및 분포에 관한 연구

조병렬(Byung Real Jo),권상운(Sang Woon Kwon),최종현(Jong Hyeun Choi),정원명(Won Myung Choung),황성태(Sung Tai Hwang) 大韓環境工學會 1995 대한환경공학회지 Vol.17 No.3

격납용기내에서 풀형화재 연소현상 해석

조병렬 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-

Liquid metal reactor(LMR) uses liquid sodium instead of water as a coolant, which is one of salient features comparing with conventional PWRs. Therefore the acquisition of liquid sodium handling technology should be preceded for the LMR development and the present study on the sodium coolant safety is an essential task in the LMR research and development. For that reason, the characteristcs of liquid sodium fire occurring when the hot sodium make a contact with the air are understood. The objective of this study is to study on the characteristics of sodium pool fires. The surface combustion model(SOFIRE II) was used for the analysis of sodium pool fire in a containment vessel. It was turned out that this model showed the overestmation results about the combustion rate and sodium temperature in comparison with experimental results.