• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.609-612
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• 2007

The co-combustion of coal and RPF(Refuse Plastic Fuel) mixture has been experimented in a commercially operating CFB coal boiler and the emissions such as SOx, NOx, TSP and dioxine were measured at the stack. The experimented RPF was supplied by domestic RPF company that is commercially producing RPF pellet from the wasted plastics. Up to 15% of total coal was substituted to RPF and no trouble was happened during normal boiler operation. SOx and NOx concentration was reduced about $15{\sim}20$% and TSP(Total Suspended Particle) was drastically reduced about 30% during co-combustion. Dioxine concentration at mixing ratio of 7.5% was $0.0487ng{\sim}TEQ/Sm^3$ ($O_2$, 12%) that satisfied governmental emission regulation.

• 환경위생공학
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• 제11권3호
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• pp.29-35
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• 1996

Numerical solutions were obtained to the model equations for various parameters characterizing the pore structure, effective internal diffusion and the chemical reaction constant. The conversion was decreased with the cause of pore closure at the surface of reacting particles, reduction of porosity, surface area of reaction and effective diffusion coefficient in the solid with the progress of reaction. Total conversion was strongly depend on the local conversion at surface. According to the decreasing of impregnated concentration of the copper oxide and the increase of the flue gases concentration, total conversion was increased. And the conversion were affected by gas flow rate and pore size distribution of the reacting solid.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1995년도 춘계학술발표회 초록집
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• pp.82-87
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• 1995

Carbon dioxide fixation by microalgae has several advantages such as no requirements for the pretreatment over phycal and/or chemical $CO_2$ fixation processes. Chlorella sp. HA-1, fresh algae. and Chlorococcum littorale. marine algae, were used to do $CO_2$ fixation work. The experimental parameters were light intensity and $CO_2$ concentration. Chlorella sp. HA-1 has the maximum growth rate at 8 Klux and 10% $CO_2$ concentration. Chlorococcum littorale showed the maximum growth at similar conditions. The results indicated the feasibility of the Chlorella HA-1 and Chlorococcum littorale for mass cultivation using flue gas.

• 분석과학
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• 제15권5호
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• pp.427-432
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• 2002

중유 및 물이 혼합된 에멀젼 연료의 연소 특성이 평가되어졌다. 에멀젼 연료의 연소가스 중 $SO_x$의 농도는 순수한 중유 연소가스의 57%로 감소되었으며, 에멀젼 연료의 연소 가스 중 $NO_x$의 농도는 순수한 중유 연소가스의 67%로 감소되었다. 에멀젼 연료 연소가스에서의 $SO_x$의 감소는 에멀젼 연료 중 포함되어있는 계면 활성제중의 salt와의 반응에 기인하는 것으로 사료된다. 또한, 에멀젼 연료의 연소 효율은 순수한 중유보다 약 6% 정도 더 높은 것으로 평가되었다.

• 한국연소학회:학술대회논문집
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• 대한연소학회 2003년도 제27회 KOSCO SYMPOSIUM 논문집
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• pp.89-94
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• 2003

For the development of high efficiency and low emission combustion systems, high temperature air combustion technology has been tested by utilizing preheated air over 1100 K and exhaust gas recirculation. In this system, combustion air is diluted with large amount of exhaust gases ($N_2$, $CO_2$), such that the oxygen concentration is relatively low in the reaction zone, leading to low flame temperature. Since, the temperature fluctuations and sound emissions form the flame are small and flame luminosity is low, the combustion mode is expected to be flameless or mild combustion. Experiment was performed to investigate the turbulent flame structure and $NO_X$ emission characteristics in the high temperature air combustion focused on coflowing jet diffusion flames which has a fundamental structure of many practical combustion systems. The effect of turbulence has also been evaluated by installing perforated plate in the oxidizer inlet nozzle. LPG was used as a fuel. Results showed that even though $NO_X$ emission is sensitive to the combustion air temperature, the present high temperature air combustion system produce low $NO_X$ emission because it is operated in low oxygen concentration condition in excess of dilution.

• 한국안전학회지
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• 제17권4호
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• pp.25-30
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• 2002

This paper demonstrates the effects of dust electrical resistivity on electrostatic precipitability. The effects of gas temperature, velocity and humidity on the collection efficency were considered by used of coal fly ashes from fluidized bed combustion boiler. The experiments for collection efficiency were carried out in the pilot plant. The ashes which have non-spherical geometry and high electrical resistivity were used. Electrical resistivity is an important property for the collection efficiency in the electrostatic precipitators. Fly ash resistivity as a function of temperature up $350{\circ}C$ and water concentration(up to 15%) has been experimentally investigated using the resistivity test equipment consisted of the movable electrode, dust cup, and furnace. As the resistivity of fly ash in the operating temperature($150{\circ}C$) of an electrostatic precipitator was measured higher than $1010{\Omega}{\cdot}$cm, flue gas conditioning in the electrostatic precipitator to reduce the resistivity of fly ash is required.

• 대한기계학회논문집B
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• 제27권5호
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• pp.561-568
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• 2003

An experiment using high preheated air in a turbulent non-premixed flame was performed to investigate the effects of high preheated air on the combustion characteristics. Combustion using high preheated and diluted air with flue gas is a new technology which enables NO emission to be reduced. In this study, Na was used as diluent and propane as fuel. Combustion characteristics, especially the distributions of the flame temperature, NO concentration and OH radical intensity were examined under the condition of 300 K, 600 K, 1000 K in terms of the combustion air temperature, and also under the condition of the dilution level from 21% to 13% in terms of oxygen concentration. As the preheated air temperature increased, it appeared that the flame length became shorter, maximum flame temperature increased, the reaction region moved to upstream, and NO concentration increased, but the flame temperature's fluctuation was reduced. In opposite, it was shown with decrement of oxygen concentration at the maximum temperature that both maximum value and the gradient of the flame temperature decreased, and NO emission also decreased considerably, but its fluctuation became larger, being inclined to be unstable.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.2050-2052
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• 2000

In this paper, the effect of $O_2$ concentration on NO removal and $NO_2$ generation by corona discharge from simulated flue gas was measured and estimated for the wire-plate reactor. $NO_2$ removal rate was 0$\sim$30[%] under about 3.4[%] of oxygen concentration, however, it was difficult to remove NOx over 3.4[%] of oxygen concentration. It may be due to generate $NO_2$ from $N_2$ and $O_2$ molecules and converse NO to $NO_2$ by 0 and $O_3$. Magnetic field applied to electric field in plasma was very effective for NOx removal under 2[%] of $O_2$ concentration.

• 멤브레인
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• 제15권4호
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• pp.310-319
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• 2005

본 연구는 LNG를 연료로 하는 화력발전소의 보일러를 대상으로 여기에서 배출되는 $8\~15\%$ 내외의 이산화탄소 배가스 1,000 $Nm^3$/일로부터 이산화탄소를 회수율 $90\%$, 농도 $99\%$로 회수하기 위한 다단 막분리 공정을 설계 및 제작하기 위한 선행연구결과이다. 본 연구실에서 이산화탄소에 대한 가소화안정성 및 이산화탄소/질소의 분리특성이 탁월한 폴리이서술폰(PES)소재를 대상으로 비대칭구조의 중공사형 분리막 및 모듈이 개발되었다[1].. 개발된 중공사막을 대상으로 모듈의 투과현상을 전산모사 하였으며 이를 이용하여 막분리 공정의 최종 회수조건에 적합하게 하기 위해 재순환공정이 가능한 4단 막분리 공정을 전산모사 하였다. 설계된 다단계 막분리 공정의 타당성을 입증하기 위해 개발된 중공사막모듈을 대상으로 설계된 운전 압력(공급측의 압력 및 투과측의 압력)과 공급 농도의 변화에 따른 막분리 공정의 투과량 및 농도를 조사하였다. 얻어진 결과를 공정모사를 통하여 계산된 결과를 비교한 결과 운전조건에 따른 유량, 순도, 막 면적 등에서 이론치와 실험치가 매우 잘 일치함을 확인할 수 있었다.

• 공업화학
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• 제21권4호
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• pp.391-395
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• 2010

본 연구는 Pt/$TiO_2$ 촉매를 이용한 $H_2$ SCR 반응에서 배가스 중 CO에 대한 영향을 조사하였다. 반응가스 중 공존하는 CO는 촉매표면의 활성점에서 환원제인 $H_2$와의 경쟁흡착을 유발하여 반응활성을 감소시키는 결과를 나타내었다. 또한 경쟁흡착은 반응활성의 감소와 함께 미반응 $H_2$ 및 CO의 생성을 야기하였으며 주입되는 CO의 농도가 증가할수록 이러한 현상들은 극심한 양상을 보였다. CO에 의한 inhibition을 최소화하기 위하여 $PdO_2$, $CeO_2$를 첨가하였으며 $CeO_2$를 첨가한 촉매가 100 ppm 이하의 공존 CO에 대한 내구성을 나타내었다.