http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
순산소 순환유동층에서 로내 탈황 및 탈질법 적용에 따른 오염물질 거동특성
최경구(Gyung-Goo Choi),나건수(Geon-Soo Na),신지훈(Ji-Hoon Shin),길상인(Sang-In Keel),이정규(Jung-Kyu Lee),허필우(Pil-Woo Heo),윤진한(Jin-Han Yun) 한국청정기술학회 2018 청정기술 Vol.24 No.3
순산소 연소기술은 화력발전에 적용 가능한 유망한 온실가스 감축 기술로 평가되고 있다. 본 연구는 환경적 관점에서 순환유동층을 활용한 순산소 연소조건에 로 내 탈황 및 탈질법을 적용하여 NO 및 SO₂의 거동을 살펴보는 한편, SO₃, NH₃, 그리고 N2O의 발생 경향도 관측하였다. 이를 위해, 연소로 내 석회석 및 요소수를 투입하였다. 로 내 탈황법은 연소가스 내 SO₂ 농도를 ~403에서 ~41 ppm까지 저감하였다. 또한 SO₃ 형성의 주원료인 SO₂가 저감되면서 연소가스 내 SO₃ 농도도 ~3.9에서~1.4 ppm까지 감소되었다. 그러나 석회석 내 CaCO₃가 NO의 발생을 촉진하는 현상도 관측되었다. 연소가스 내 NO 농도는로 내 탈질법을 적용하여 ~26 - 34 ppm까지 저감되었다. 요소수 투입량 증가에 따라 연소가스 내 NH₃ 농도가 증가하여 최대~1.8 ppm으로 나타났으며, N₂O의 농도도 ~61에서 ~156 ppm까지 증가하였다. N₂O 발생량 증가 현상은 요소수의 열분해 과정에서 생성된 HNCO가 N₂O로 전환되어 나타난다. 본 연구의 결과를 통해 로 내 연소가스 세정법을 적용할 경우 NOx 및 SOx의 저감뿐만 아니라, 다른 오염물질의 발생에 대한 주의가 필요할 것으로 보인다. Oxy-fuel combustion is considered as a promising greenhouse gas reduction technology in power plant. In this study, the behaviors of NO and SO₂ were investigated under the condition that in-furnace deNOx and deSOx methods are applied in oxy-fuel circulating fluidized bed combustion condition. In addition, the generation trends of SO₃, NH₃ and N2O were observed. For the purpose, limestone and urea solution were directly injected into the circulating fluidized bed combustor. The in-furnace deSOx method using limestone could reduce the SO₂ concentration in exhaust gas from ~403 to ~41 ppm. At the same experimental condition, the SO₃ concentration in exhaust gas was also reduced from ~3.9 to ~1.4 ppm. This trend is mainly due to the reduction of SO₂. The SO₂ is the main source of the formation of SO₃. The negative effect of CaCO₃ in limestone, however, was also appeared that it promotes the NO generation. The NO concentration in exhaust gas reduced to ~26 - 34 ppm by appling selective non-catalytic reduction method using urea solution. The NH₃ concentration in exhaust gas was appeared up to ~1.8 ppm during injection of urea solution. At the same time, the N₂O generation also increased with increase of urea solution injection. It seems that the HNCO generated from pyrolysis of urea converted into N₂O in combustion atmosphere. From the results in this study, the generation of other pollutants should be checked as the in-furnace deNOx and deSOx methods are applied.
길상인(Sang-In Keel),박호영(Ho-Young Park),김영주(Young-Joo Kim),윤성환(Sung-Hwan Youn) 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Lots of Coal power plants (about 30) using bituminous coals are being run in Korea. The use of high volatile low grade sub-bituminous coal is increasingly extended because of imbalance between the worldwide coal supply and demand. Mill-fire has been an important issue since the use of such sub-bituminous coal. In existing coal plants of Korea, shutdown of coal and air supplies could be only a way, and an alternative has not been found in suppressing the mill fire. The inside fowfield in the mills has a highly fuel-rich, low temperature, and high velocity and non-reactive such that it could be a nonreactive system essentially. Nevertheless, occasional fire-occurrence could be attributed to the existence of an ignition source. However it has not been so far investigated in detail. The current work has a focus on suppressing the mile fire via some parametric experimental study such as effects of temperature, residence time, ignition source, and inert gas mixing. The results show that an small amount of CO2- or N2-mixing with air is very effective in suppressing fire formation even at high temperatures or flying sparks. The results suggest that exhaust gas recirculation into the mill should be an alternative to suppress mill fire.
김학준(Hak-Joon Kim),한방우(Bangwoo Han),정상현(Sang-Hyun Jeong),홍원석(Won-Suk Hong),신완호(Wan-Ho Shin),송동근(Dong-Keun Song),길상인(Sang-In Keel),김용진(Yong-Jin Kim),홍정희(Jeong-Hee Hong) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In a test duct with closed configuration, particle removal performance of an edge-plate type electrostatic precipitator (ESP) was evaluated at a high flow rate in CO₂ rich environments by changing gap distances between collection plates, concentrations of CO₂, particle sizes, types of electrodes, and types of power supplies. At the same experimental conditions, collection efficiency of particles with the mean particle size, 300 ㎚, decreased as the gap distance and CO₂ concentration increased because of low electrostatic force and low discharged current. In addition, as the particle size increased, the efficiency increased because of high charging rate of the large particles. With the electrode type which has higher surface area of a discharging plate and with the power supply which applied 25 ㎑-pulsed DC voltages, the removal efficiency was high even in rich CO₂ condition due to high electrostatic force at the same power consumption.
직류 전기장을 인가한 층류부착화염에서 물질-열 확산 및 부력에 의한 화염진동 비교에 관한 연구
한종규(Jong Kyu Han),윤성환(Sung Hwan Yoon),박정(Jeong Park),김정수,윤진한(Jin Han Yun),길상인(Sang In Keel),김영주(Young Ju Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, established from the horizontal and vertical injections. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3?7.4 ㎐ were observed at flame conditions with Lewis number more than unity. On the other hand, Lewis-number-induced self-excitation as well as buoyancy-driven self-excitation appeared in the vertical upward injection with DC electric fields. The buoyancy-induced self-excitation frequency was in range of 1.6 - 9.4 ㎐. The characteristics of the two self-excitations with similar frequency ranges is discussed.
H<sub>2</sub>-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO<sub>2</sub> 첨가 효과
길상인,박정,Keel, Sang In,Park, Jeong 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Numerical study was conducted to clarify effects of added $CO_2$ for the downstream interaction between $H_2$-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having $CO_2$ addition into $H_2$-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of $H_2$, in which $H_2$-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route $CO+O_2{\rightarrow}CO_2+O$ with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including $CO+OH{\rightarrow}CO_2+H$ with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added $CO_2$ suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added $CO_2$ was addressed to the present downstream interaction.
H₂-공기와 CO-공기 예혼합화염 사이의 후류상호작용에 있어서 CO₂ 첨가 효과
길상인(Sang In Keel),박정(Jeong Park) 한국연소학회 2013 한국연소학회지 Vol.18 No.4
Numerical study was conducted to clarify effects of added CO₂ for the downstream interaction between H₂-air and CO-air premixed flames in counterflow configuration. The reaction mechanism adopted was Davis model which had been known to be well in agreement with reliable experimental data. The results showed that both lean and rich flammable limits were reduced. The most discernible difference between the two with and without having CO₂ addition into H₂-air and CO-air premixtures was two flammable islands for the former and one island for the latter at high strain flame conditions. Even a small amount of H₂, in which H₂-air premixed flame cannot be sustained by itself, participates in CO oxidation, thereby altering the CO-oxidation reaction path from the main reaction route CO + O₂ → CO₂ + O with a very long chemical time in CO-air flame to the (H, O, OH)-related reaction routes including CO + OH → CO₂ + H with relatively short chemical times. This intrinsic nature alters flame stability maps appreciably. The results also showed that chemical effects of added CO₂ suppressed flame stabilization. Particularly this phenomenon was appreciable at flame conditions which lean and rich extinction boundary was merged. The detailed discussion of chemical effects of added CO₂ was addressed to the present downstream interaction.
수거된 해양패기물 자원화 기술 개발(I) - 해양패기물의 폐기물 연료화 -
길상인,윤진한,최연석,강창구,유정석,Keel Sang-In,Yun Jin-Han,Choi Yeon-Seok,Kang Chang-Gu,Yu Jeong-Seok 한국해양환경•에너지학회 2002 한국해양환경·에너지학회지 Vol.5 No.2
본 연구는 수거된 해양폐기물을 원료로 이용하여 폐기물연료(RDF : Refuse Derived Fuel)를 제조하는 공정 개발을 목적으로 하고 있으며, 산업용 연료로서의 활용 가능성을 확인하기 제조된 RDF의 물성분석을 분석하였다. 해양폐기물은 로우프에서의 납제거와 파쇄 그리고 해저 슬러지의 세척과 같은 전처리, 그리고 가연성분의 입자화 공정을 통하여 해양폐기물이 에너지로 변환하는 것이 가능하게 되었다. 이와 같은 해양폐기물 자원화 공정은 수거 폐기물의 환경적 처리는 물론 대체에너지 확보의 측면에서 매우 유익한 것으로 사료된다. The purpose of this study is the RDF process development for the disposal of marine debris, and physical properties of RDF was analyzed for the reliability as a industrial fuel. By the separation of lead from the waste rope and the pelletizing of burning material, marine debris changes to fuel resources. The resource recycling process is effective in the clean treatment of waste and the secure of substitute energy.
고온 반응로에서 로 내 탈황을 위한 CaCO₃ 흡착제 입자의 주위 기체와 체류시간에 따른 특성 변화
이강수(Kang Soo Lee),정재희(Jae Hee Jung),길상인(Sang In Keel),김상수(Sang Soo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In-furnace desulfurization technique is applied to the O₂/CO₂ combustion system for CCS process despite of its low desulfurization efficiency because this combustion system needs not additional chamber for the desulfurzation. The CaCO₃ sorbent, which has wide size range from a few nanometers to several tens of micrometers, is used for this process. In this study, the experimental system which can simulate the O₂/CO₂ combustion system was developed. CaCO₃ sorbent was exposed to the reactor at l200℃ with various residence times (0.33~1.46 sec) in air and CO₂ surroundings, respectively. Then, the sorbent particles were sampled at inlet and outlet of the reactor and analyzed quantitatively/qualitatively using SMPS, APS, XRD, and SEM. In a result, it was shown that the residence time and CO₂ surrounding condition in a reactor can affect the characteristics of CaCO₃ sorbents for In-furnace desulfurization technique.