• 한국해양공학회지
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• 제20권4호
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• pp.50-57
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• 2006

The effect of discharges from the Seomjin River on the dispersion of thermal effluent from the Hadong Power Plant, located along the south coast of Korea, was investigatedusing intensive field observation and three-dimensinal Princeton Ocean Model simulations. A POM and observed CTD data was used to predict the mixing behaviour of the Summer freshet, during the July 2005 intensive observing period. The dispersal of the river discharge anomaly, associated with the Seomjin River plume, was seen to be highly responsive to tidal currents and river flows during the spring tide.

• KEPCO Journal on Electric Power and Energy
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• 제1권1호
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• pp.115-120
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• 2015

$K_2CO_3$-based dry regenerable sorbents were prepared by spray-drying techniques to improve mass produced $K_2CO_3-Al_2O_3$ sorbents (KEP-CO2P, hereafter), and then tested for their $CO_2$ sorption capacity by a $2,000Nm^3/h$ (0.5 MWe) $CO_2$ capture pilot plant built for Unit 3 of the Hadong thermal power station in 2010. Each of the sample sorbents contained 35 wt.% $K_2CO_3$ as the active materials with various support materials such as $TiO_2$, MgO, Zeolite 13X, $Al_2O_3$, $SiO_2$ and hydrotalcite (HTC). Their physical properties and reactivity were tested to evaluate their applicability to a fluidized-bed or fast transport-bed $CO_2$ capture process. The $CO_2$ sorption capacity and percentage utilization of $K_2CO_3$-MgO based sorbent, Sorb-KM2, was $8.6g-CO_2/100g$-sorbents and 90%, respectively, along with good mechanical strength for fluidized-bed application. Sorbs-KM2 and KT were almost completely regenerated at $140^{\circ}C$. No degradation of Sorb-KM by $SO_2$ added as a pollutant in flue gas was observed during a cycle test.

• 한국수소및신에너지학회논문집
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• 제23권5호
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• pp.503-512
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• 2012

There is a new power generation system such as direct coal fuel cell (DCFC) with a solid oxide electrolyte operated at relatively high temperature. In the system, it is of great importance to feed coal continuously into anodic electrode surface for its better contact, otherwise it would reduce electrochemical conversion of coal. For that purpose, it is required to improve the electrochemical conversion efficiency by using either rigorous mixing condition such as fluidized bed condition or just by recirculating coal particle itself successively into the reaction zone of the system. In this preliminary study, we followed the second approach to investigate how significantly particle recycle would affect the coal conversion efficiency. As a first phase, coal conversion was analyzed and evaluated from the thermochemical reaction of carbon with air under particle recirculating condition. The coal conversion efficiency was obtained from raw data measured by two different techniques. Effects of temperature and fuel properties on the coal conversion are specifically examined from the thermochemical reaction.

• 대한기계학회논문집B
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• 제35권9호
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• pp.939-946
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• 2011

석탄은 고정탄소분, 휘발분, 수분, 회로 구성되며, 연소시 회성분과 소량의 고정탄소분이 남게 된다. 석탄 화력 발전소에서는 석탄연소 후 나오는 잔여물(고정탄소분, 회)를 통칭하여 석탄회 라고 부르고 있다. 현재 발전소에서는 정제회(LOI함량 6%미만)는 경량골재의 원료로 재활용해 수익을 창출하고 있으나, LOI함량이 높은 회는 재활용이 불가능해 땅에 매립하고 있다. 이에 따라 환경적인 부담금을 줄이고 정제회 판매의 수익을 올리기 위해 회성분의 LIO감량은 필수적이다. 본 연구에서는TGA(Thermo-gravime- tric analysis)와 DTF(Drop tube furnce) 실험을 통해 석탄과 석탄회 연소를 위한 실험적인 상수 값을 결정하였다. 500MW급 표준화력발전 보일러를 모델링하고, 전산해석을 위해 격자를 형성시키고 적절한 해석 모델을 선정하였으며, 석탄회 재연소 시뮬레이션을 수행하여 석탄회 투입시 보일러 내부의 온도 및 유동을 모사하였다. 보일러 내부 석탄 입자와 회입자의 이동 궤적을 통해 가능한 높은 버너 위치에서 석탄회를 투입하는 것이 적절함을 나타내었다. 또한 실제 설치 가능한 D버너에서 6ton/h로 공급시에 기존의 보일러에 큰 영향을 주지 않으며 재연소 가능함을 알 수 있다.