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Goyang, South Korea

Choi S.M.,University of Seoul | Lee W.S.,T sec Structural Engineering | Lee S.W.,Korea East - West Power Co, Ltd. | Moon J.Y.,University of Seoul
Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 | Year: 2013

Braces controlling tension have been used to resist lateral force in most of medium and row-rise steel structures. Providing high stiffness and strength, these steel brace frames are effective to resist lateral force and control story drift. However, the steel braces are subject to compressive load, they experience the deterioration in load capacity due to bending buckling before yield stress and ideal energy dissipation is unfeasible, which causes unstable behavior of the structure. Therefore, this study has to do with a reinforcing method of the compression brace proposed as friction bolt connection. In order to verify the compressive behavior of the reinforced braces, structural performance test was conducted with variables of slenderness ratio and the amount of reinforcement. Source


Ryu J.-S.,Korea East - West Power Co, Ltd. | Kim K.-S.,Inha University | Park S.-J.,Inha University
Applied Chemistry for Engineering | Year: 2011

In this work, various wood biomasses were used to determine the combustion characteristics for the fuel of cogeneration plant. Combustion characteristics of four types, i.e., (i) forest products, (ii) recycled wood, (iii) empty fruit bunch, and (iv) palm kernel shell, were examined via thermal gravimetric analyzer (TGA) in air atmosphere and coal was used as a comparison group. From the TGA results, the combustion of the wood biomass was occurred in the range of 280 to 420 °C, which was lower than that of coal. Forest product showed the lowest activation energy (0.4 kJ/mol) compared to that of other wood biomasses (about 6 to 14 kJ/mol) and coal (64 kJ/mol). In addition, the reaction rate constant of the wood biomass was lower than that of coal. These results indicate the higher combustion initiation rate of wood biomass due to the high content of volatile matter, which had a low boiling point. Source


Ryu J.-S.,Korea East - West Power Co, Ltd. | Kim K.-S.,Inha University | Park S.-J.,Inha University
Journal of Industrial and Engineering Chemistry | Year: 2012

Polystyrene (PS)/wood chip (WC) composites (PS/WC) were prepared by solution mixing method and the effect of polystyrene on thermal characteristics of WC was investigated with different PS/WC ratios. The copyrolysis and heating value of the PS/WC were determined by thermogravimetric analyzer and calorimeter, respectively. From the results, the PS/WC revealed copyrolysis features in the range of 360-440. °C compared to WC and PS and exhibited high heating value over about 5000. kcal/kg at low PS content (PS/WC = 2/8). These results were attributed to the combination effect by interaction between polystyrene and wood chip. © 2012 The Korean Society of Industrial and Engineering Chemistry. Source


Lee J.H.,KEPCO E&C | Lee D.W.,KEPCO E&C | Gyu J.S.,KEPCO E&C | Kwak N.-S.,KEPCO E&C | And 4 more authors.
Korean Chemical Engineering Research | Year: 2015

Estimating potential of CO2 emission reduction of non-capture CO2 utilization (NCCU) technology was evaluated. NCCU is sodium bicarbonate production technology through the carbonation reaction of CO2 contained in the flue gas. For the estimating the CO2 emission reduction, process simulation using process simulator (PRO/II) based on a chemical plant which could handle CO2 of 100 tons per day was performed, Also for the estimation of the indirect CO2 reduction, the solvay process which is a conventional technology for the production of sodium carbonate/sodium bicarbonate, was studied. The results of the analysis showed that in case of the solvay process, overall CO2 emission was estimated as 48,862 ton per year based on the energy consumption for the production of NaHCO3 (7.4 GJ/tNaHCO3). While for the NCCU technology, the direct CO2 reduction through the CO2 carbonation was estimated as 36,500 ton per year and the indirect CO2 reduction through the lower energy consumption was 46,885 ton per year which lead to 83,385 ton per year in total. From these results, it could be concluded that sodium bicarbonate production technology through the carbonation reaction of CO2 contained in the flue was energy efficient and could be one of the promising technology for the low CO2 emission technology. Source


Lee J.H.,KEPCO E&C | Lee D.W.,KEPCO E&C | Gyu J.S.,KEPCO E&C | Kwak N.-S.,KEPCO E&C | And 4 more authors.
Korean Chemical Engineering Research | Year: 2014

Economic evaluation of the manufacturing technology of high-value chemicals through the carbonation reaction of carbon dioxide contained in the flue gas was performed, and analysis of the IRR (Internal Rate of Return) and whole profit along the production plan of the final product was conducted. Through a carbonation reaction with sodium hydroxide that is generated from electrolysis and by using carbon dioxide in the combustion gas that is generated in the power plant, it is possible to get a high value products such as sodium bicarbonate compound and also to reduce the carbon dioxide emission simultaneously. The IRR (Internal Rate of Return) and NPV (Net Present Value) methods were used for the economic evaluation of the process which could handle carbon dioxide of 100 tons per day in the period of the 20 years of plant operation. The results of economic evaluation showed that the IRR of baseline case of technology was 67.2% and the profit that obtained during the whole operation period (20 years) was 346,922 million won based on NPV value. When considering ETS due to the emissions trading enforcement that will be activated in 2015, the NPV was improved to a 6,000 million won. Based on this results, it could be concluded that this CO2 carbonation technology is an cost-effective technology option for the reduction of greenhouse gas. Source

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