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전영남,채종성 조선대학교 환경연구소 1995 環境公害硏究 Vol.12 No.-
Numerical simulation was performed for the 3-dimensional flow filed of gas and particle phase for cyclone dust collector. FVM(Finite Volume Method) was employed for gas phase. The flow was solved using the k-ε turbulence model. The particle exit at the bottom of the cone was treated as a solid wall in this model because the gas flow through the effective dust exit is usually insignificant. The major parameters considered in this study was vortex finder diameter, effective dust exit diameter, vortex finder length, inlet type for dimension performance. Particle trajectory calculations were made for three different particle sizes of 1, 25 and 50 ㎛. The results obtained from this study give some physical insight of dust particle collection mechanism together with the indication of the collection efficiency. The simulation results were in generally good agreement with empirical knowledge. The application of this kind of computer program looks promising as a potential tool for the design of cyclone and determination of optimum operating Condition.
전영남,Dae Won Ji,Kunio Yoshikawa 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
A study on pyrolysis, steam gasification, and carbonization-activation was conducted to produce energy and resource from waste sewage sludge. Carbonization-activation is a sequential process of pyrolysis and steam gasification. The experiment was conducted with a batch-type fixed bed reactor. A comparative analysis on the formation characteristics of products, such as gas, tar, and char, was conducted to evaluate the three cases. For sludge char, carbonization-activation showed the largest amount of porosity in the char, and its specific surface area was 80.28 m2/g with an average pore diameter of 6.229 nm. The best adsorption ability of benzene, a light tar, was 175 mg/g. For the producer gas, steam gasification obtained the largest amount of 20.1 L. Similarly, carbonization-activation showed a large value of 16.6 L. Hydrogen and carbon monoxide concentrations were higher in the producer gas due to steam reforming compared with carbonization-activation. Energy yields were 209 kJ and 226 kJ for steam gasification and carbonization-activation, respectively. The amount of tar formation did not show a significant difference, but the largest one was found in steam gasification. The gravimetric tar amount for steam gasification was 23.5 g/Nm3. However, the selected light tar displayed the lowest concentration for the carbonization- activation. Such concentrations were 2.79 g/Nm3, 0.75 g/Nm3, 0.14 g/Nm3, and 0.14 g/Nm3 for benzene, naphthalene, anthracene, and pyrene, respectively. Therefore, carbonization-activation was found to be the most effective process for producing high quality sludge char and producer gas for utilizing waste sludge into renewable energy and resources.
전영남,임문섭,조대영 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.3
Refuse plastic fuel (RPF) as materials for the recycling processes (Materiel Recycling) present difficulties with the mixing, the demolishing, the molding and the drying steps. While using RDF as a fuel by pyrolysis, accompanying tar and soot causes many problems like clogging, the corrosion and the erosion of the chloride channel. Using the intermittent pyrolysis equipment during the decomposition of the RPF gases H2, CH4, CO and among the by-products of Cl2 and HCl, Tar is produced in a large quantity. With understanding the by-products decomposition system of the Cl2, H2, Tar and the gases H2, CH4, CO we can understand the nature of the generation of the products. The experimental conditions were chosen according to the temperature of the decomposition (300 ~ 900o℃), While varying RPF 2 g, pyrolysis temperature 700℃ during a holding time of 32 min : the H2 gas 1.71%, CH4 2.54%, CO 4.63%, Cl2 12.86 ppm, HCl 30.2 ppm were composed. Also light tar benzene 18.45 g/㎥, naphthalene 0.86 g/㎥, anthracene 0.09 g/㎥, pyrene 0.04 g/ ㎥, gravimetric tar 31.8 g/㎥, and char 0.45 g was formed.
덤프 소각기에서 CCI_4/C_3H_8 분해 특성에 관한 연구
전영남,채종성,송형운,김미환 조선대학교 환경연구소 2001 環境硏究 Vol.17 No.1
A major source of the hazardous waste generated is from chemical industries producing plastics, herbicides, pesticides and chlorinated solvents. All of these process produce a class of hazardous waste termed the chlorinated hydrocarbons(CHCs), either directly or from undesirable side reactions. Generally, hazardous waste is physical characteristics of difficult destruction at high temperature. We investigated the destruction characteristics of hazardous waste through incineration. A nonequilibrium combustion model was used to describe the effect of the chemical kinetics due to the flame inhibition characteristics of CCl_4 which was used as the surrogate of hazardous waste. In this study, the numerical simulation data for 3-dimensional dump combustor shows a quantitative good agreement with experimental data. Also dump incinerator shows high destruction efficience of CCl_4. And parametric screening studies was carried out through numerical simulation with changed CCl_4/C_3H_8 ratio, waste injection velocity and waste equilibrium ratio.