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Sogang University, Cottrell and Korea Southern Power Co. | Date: 2014-08-01

The embodiments described herein pertain generally to an amalgam electrode, and a producing method of the amalgam electrode, and an electrochemical reduction method of carbon dioxide using the amalgam electrode.

PubMed | Korea Southern Power Co., University of California at San Francisco and Pusan National University
Type: Journal Article | Journal: Asian nursing research | Year: 2014

This study aimed to identify factors affecting the use of the hearing protection devices (HPDs) among workers exposed to noise using the Pender Health Promotion Model.The 222 subjects came from thermal power plants with similar noise levels, which are between 80 dB and 90 dB in South Korea. Data were collected with self-administered questionnaires designed to measure concepts from the Health Promotion Model.Mean percent times of using the HPDs at their most recent job site were 50.9%, and 20.3% had never the HPDs. The predictors of HPD use were social modeling (OR = 1.380), perceived benefits (OR = 1.150), and working at noisy worksites (OR = 4.925) when the outcome was based on the non-use versus used at least once. However, the predictors of HPD use were social modeling (OR = 1.795) and perceived benefits (OR = 1.139) based on the less than half-of-the-time-use versus more than half-of-the-time-use.Social modeling and perceived benefits of using the HPDs are important for workers to keep minimal or certain level of using the HPDs.

Jung J.-H.,Pohang University of Science and Technology | Lee U.,Korea Southern Power Corporation | Kim S.-H.,Agency for Defense Development | Park S.-H.,Pukyong National University
Progress in Electromagnetics Research | Year: 2013

To cope with the energy shortage and the rising cost of the fossil fuel, many wind farms are being constructed under the supervision of Korean government along the coasts of Korean peninsula to generate clean and renewable energy. However, construction of these wind farms may cause negative e®ect on various L-band radars in operation. This paper presents the result of the micro-Doppler (MD) analysis of the in°uence of the wind turbine on the L-band radar using the point scatterer model and the radar cross section of the real turbine predicted by the method of physical optics. The simulation results obtained at three observation angles show that the range of MD occupies a considerable portion of the helicopter MD range, and thus, the operations using helicopters need to be avoided in the wind farm region, and additional radars are required for the recognition of helicopter-like objects.

Park Y.C.,Korea Institute of Energy Research | Jo S.-H.,Korea Institute of Energy Research | Kyung D.-H.,Korea Institute of Energy Research | Kim J.-Y.,Korea Institute of Energy Research | And 3 more authors.
Energy Procedia | Year: 2014

The ground-breaking ceremony of the10 MWe-scale dry-sorbent CO2 capture process was held in August 2012 and the construction was finished in October 2013. It was integrated with a 500 MW power plant and used a slip-stream of that, located at the Hadong coal-fired power plant (Unit #8), Korea Southern Power Company. From October 2013, Korea Institute of Energy Research (KIER), Korea Southern Power Company, and KC Cottrell have executed the test operations in order to find out the optimal operational conditions and several modification parts to achieve the target project goals of the 10 MWe-scale dry-sorbent CO2 capture technology. The dry-sorbents have been developed by KEPCO Research Institute and massively produced and supplied by TODA-ISU, which consists of 35 wt.% of active components for the CO2 sorption and 65 wt.% of supporters for the mechanical strength. The some portions of the dry-sorbents have been tested at the 0.5 MWe-scale dry-sorbent CO2 capture process in order to analyze the sorbent performance through the two-week operation campaign in June 2013. During the test operations, the 10 MWe-scale dry-sorbent CO2 capture process has been divided into four parts such as a sorbent handling part, a flue gas pre-treatment part, a main reactor part, a utility (steam, cooling water, and instrument air) part. In the sorbent handling part, the sorbent feeding system has been tested so that the sorbent has automatically fed to the reactor system and conversely fed to the sorbent silo. In the flue gas pre-treatment part, main blower, the secondary flue gas desulfurization, and the moisture control of the flue gas have been tested. In the main reactor part, the solid hold-up in the carbonation reactor, the solid circulation rate, control concept, and the reaction performance of the sorbent have been tested. In the utility part, steam supply, cooling tower operation, and instrument air compressor operation have been tested. The test operations will be done on January 2014 and the long-term continuous operations will be performed from early March 2014. We plan to continuously operate the 10 MWe-scale dry-sorbent CO2 capture process from the second quarter of this year, to analyze the economics of the dry-sorbent CO2 capture technology based on the operational results, and to finish FEED of the 300 MWe-scale dry-sorbent CO2 capture technology until the end of the third quarter of this year. © 2014 The Authors Published by Elsevier Ltd.

Kim W.,Korea Southern Power Co. | Lee D.-J.,Korea Southern Power Co. | Park S.-W.,Korea Southern Power Co.
Evolutionary Ecology | Year: 2011

Recently, the use of NOx control retrofits is significantly increasing due to further tightening of regulations caused by worldwide environmental concerns. In order to reduce NOx emissions, most of the generators are equipped with SCR (Selective Catalytic Reduction) or OFA (Over-Fire Air) systems, while some generators being equipped with both systems. Here we present experimental evidence of higher boiler efficiency with efficient NOx control with consideration for influences on unburned carbon, under the condition that it should meet local and federal emissions requirements. The higher boiler efficiency has been achieved for a newly installed SCR system by optimizing OFA and reducing excess air quantity. The test was conducted over 6 months with a 500 MW coal-fired boiler. Stepwise closing of OFA dampers was carried out with and without simultaneous excess air optimization at a 500 MW nominal rating. We confirmed that our new operation leads to the following benefits: a) Reduction of UBC due to higher temperature in the furnace's main combustion zone, b) Improved fly-ash recycling ratio, c) Reduction of spray water into re-heater due to lower temperatures in the second (upper) combustion zone, and d) Reduction of exhaust gas loss. As a result, the boiler efficiency has increased by up to 0.4% and UBC (unburned carbon) has decreased by 0.8%. In conclusion, we confirmed that our new operation mode yields better boiler efficiency for newly installed SCR systems and mixed coal firing operating conditions. © 2011 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Najjar Y.S.H.,Jordan University of Science and Technology | Al-Zoghool Y.M.A.,Korea Southern Power Co.
Journal of Engineering Thermophysics | Year: 2015

This paper studies the different greening techniques of inlet air cooling and compares their effects on performance, especially power, efficiency, fuel consumption, and condensable water. A comparison between four air cooling techniques, namely, mechanical chillers, absorption chillers, evaporative cooling and fogging systems was performed on a gas turbine. The performance characteristics were examined for a set of design and operational variables including ambient temperature, relative humidity, compressor pressure ratio, and turbine inlet temperature. The absorption chiller is a single-stage vapor absorption refrigeration system using water-lithium bromide (H2O/LiBr) as the working fluid, where the generator and the absorber have fixed temperatures with variation in the heat load (evaporative cooling load) that produces the gas turbine inlet air temperature value of 5°C. The analysis showed that the evaporative cooling enhanced the power by up to 8.7% and efficiency by up to 3.3%. On the other hand, the fogging system enhanced the power by up to 9.5% and the efficiency by up to 3.5%. The mechanical chiller reduced the temperature by 20 to 45°C; enhancing the net power by 7 to 24.3% and improving the efficiency by 2.4 to 18.8%, whereas the absorption chillers enhanced the net power by up to 12.1 to 37.3% and improved the efficiency by up to 31.5%. © 2015, Pleiades Publishing, Ltd.

Yoo K.,Korea Southern Power Corporation | Jeong K.-S.,Korea Southern Power Corporation
Transactions of the Korean Society of Mechanical Engineers, B | Year: 2012

Fly ash erosion is a leading cause of boiler tube failure in PC boilers. Therefore, shields or baffle plates are installed in specific areas to mitigate fly ash erosion and prevent boiler tube failure. However, the tube failure problems caused by fly ash erosion cannot be eliminated with this solution alone, because each PC boiler has a different flue-gas flow pattern and erosion can become severe in unexpected zones. This problem is caused by an asymmetric internal flow velocity and local growth of the flue gas velocity. For these reasons, clearly defining the flow pattern in PC boilers is important for solving the problem of tube failure caused by fly ash erosion. For this purpose, the cold air velocity technique (CAVT) can be applied to the fly ash erosion problem. In this study, CAVT was carried out on the Hadong #2 PC boiler and the feasibility of application of CAVT to conventional PC boilers was validated. © 2012 The Korean Society of Mechanical Engineers.

Park Y.-C.,Korea Southern Power Co. | Lee E.-S.,Korea Southern Power Co. | Son H.-S.,Inha University | Lee S.-H.,Inha University
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

In order to recover the power system during the wide power outage or power failure in the power plant, black start system should be properly operated without any problem. Especially power for black start in the geographically isolated areas of electric island is supplied from small emergency start-up generator, and loads are aux systems of gas turbines such as SFC(Static frequency converter). This paper introduces the international practices to overcome the voltage drop problem with harmonics of the system having the DC output such as SFC during black start in weak feed system and analyzes the relationship between house load inputs and harmonics. By varying the house load and input of power supply, this paper identified boundaries between weak feed and strong feed power. In order to verify the theory of stable condition in weak feed power system with DC output, house load is simulated using ETAP. Additionally MATLAB was used for harmonic analysis between the load inertia moment and non load inertia moment. Copyright © The Korean Institute of Electrical Engineers.

Jang S.-H.,Konkuk University | Roh J.H.,Konkuk University | Kim W.,Korea Southern Power Co. | Sherpa T.,Konkuk University | And 2 more authors.
Journal of Electrical Engineering and Technology | Year: 2011

This paper proposes a novel binary ant colony optimization (NBACO) method. The proposed NBACO is based on the concept and principles of ant colony optimization (ACO), and developed to solve the binary and combinatorial optimization problems. The concept of conventional ACO is similar to Heuristic Dynamic Programming. Thereby ACO has the merit that it can consider all possible solution sets, but also has the demerit that it may need a big memory space and a long execution time to solve a large problem. To reduce this demerit, the NBACO adopts the state probability matrix and the pheromone intensity matrix. And the NBACO presents new updating rule for local and global search. The proposed NBACO is applied to test power systems of up to 100-unit along with 24-hour load demands.

Korea Electric Power Corporation and Korea Southern Power Co. | Date: 2016-06-24

A heat exchange apparatus for circulating fluidized bed boilers is disclosed. The heat exchange apparatus for circulating fluidized bed boilers includes a particle separator configured to separate an exhaust gas and a flow medium discharged from a combustion furnace, an external heat exchanger into which the flow medium collected in the particle separator flows and which is configured to heat a heat transfer medium by heat exchange with the flow medium, and a flow control unit installed at the external heat exchanger and configured to supply air to a flow path of the flow medium and to regulate an internal temperature of the external heat exchanger under the control of a flow direction and a flow quantity of the flow medium.

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