• Proceedings of the KSME Conference
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• 2005.11a
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• pp.35.2-35.2
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• 2005

• Journal of the korean Society of Automotive Engineers
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• v.11 no.2
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• pp.8-12
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• 1989

본 강좌에서는 연소과정중에서의 NOx 생성기구 및 기존의 NOx 저감방법과 최근에 발표된 바 있는 연소방법의 변화에 의한 NOx의 생성억제 가능성에 대한 결과를 소개한다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.322-323
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• 2003

LNG보일러는 국내에서 환경개선을 목적으로 사용이 점차적으로 증가하고 있다. LNG는 타연료 연소에 비해 아황산가스나 기타 대기오염물질을 거의 발생시키지 않지만 NOx의 경우 연소 특성상 발생될 수밖에 없다. 따라서 본 연구의 목적은 LNG보일러 중에서 국내 배출계수 연구가 미비한 가정용 가스보일러와 산업용 요ㆍ로에서의 NOx 배출계수를 국내 실정에 맞게 개발하고 배출되는 NOx 특성을 파악하여 정확한 대기오염 배출량 산출에 관한 기초를 마련하고자 하였다. (중략)

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.05a
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• pp.73-78
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• 1998

상용 IGCC발전소의 특징적 공정흐름에 대한 분석기술의 확보를 위해 PDU급 IGCC발전계통에 대한 성능평가와 NOx 배출에 대한 모델링을 수행하였다. 향후 IGCC발전소 건설시 선정가능성이 있는 4가지 가스화 공정에서 생산되는 석탄가스를 연료로 하고, 그 발전계통의 대상 가스터빈은 산업현장에서 사용되고 있는 GE사의 LM1600PA를 선정하였다. 석탄가스는 천연가스에 비해 가스터빈의 효율과 출력 상승을 가져오나, 이와 동시에 압축기 탈설계점 작동문제를 야기 시킬 수 있다. 또한 NOx 발생량은 석탄가스 연소시 급격히 증가하며, NOx 제어를 위해 질소분사가 이루어져야 함을 알 수 있었다.

• Journal of Mechanical Science and Technology
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• v.18 no.9
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• pp.1640-1647
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• 2004

This study was to investigate the effects of water induction through the air intake system on the characteristics of combustion and exhaust emissions in an IDI diesel engine. The fuel injection timing was also controlled to investigate a method for the simultaneous reduction of smoke and NOx when water was injected into the combustion chamber. The formation of NOx was significantly suppressed by decreasing the gas peak temperature during the initial combustion process because the water played a role as a heat sink during evaporating in the combustion chamber, while the smoke was slightly increased with increased water amount. Also, NOx emission was significantly decreased with increase in water amount. A simultaneous reduction in smoke and NOx emissions was obtained when water was injected into the combustion chamber by retarding more 2$^{\circ}C$A of the fuel injection timing than without water injection.

• Journal of the Korean Society of Combustion
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• v.4 no.1
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• pp.131-139
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• 1999

A Numerical Analysis of NOx production in Hydrogen-Air flame is performed using the quasi-laminar reaction modelling. As results, in low global strain rate region, $U_F/D_F\;{\leq}\;50,000$, the quasi-laminar reaction modelling reproduces the experimentally observed EINOx half power scaling that the ratio of EINOx and flame residence time, $L_f^3(D_F^2U_F)$, is proportional to the square root of global strain rate. Thus, it suggests that turbulence-chemistry interaction has a minor impact on the trend of NOx production in low global strain rate region. However, the quasi-laminar reaction modelling predicts the higher temperature and NOx than experimentally observed. This overprediction may be due to the lack of radiation and quasi-laminar reaction modelling.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.05a
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• pp.588-591
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• 2004

Generally, $TiO_2$ powders absorb ultraviolet rays and make oxidation/reduction reactions on its surface. Hydroxide radical(OH), a product of photocatalyst reactions, has so strong oxidation/reduction electric potential that it can oxidize noxious gas like VOCs(Volatile Organic Compounds) and NOx. In this study, $TiO_2$ was substituted for exposed concrete to investigate the purifying degree of VOCs(Benzene, Toluene) and NOx. Anatase types of $TiO_2$ were used as photocatalyst. The sun rays and the ultraviolet were used as a light source. Anatase type $TiO_2$ was better than rutile type in purifying performance. The sunray showed the best purifying performance among the light sources. $3\%$ substitution of $TiO_2$ with the sunray was enough to purify VOCs(Benzene, Toluene) and NOx efficiently.

• Journal of Korean Society for Atmospheric Environment
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• v.1 no.1
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• pp.83-92
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• 1985

In odrder to survey the emission level of air pollutants from diesel vehicles, was measured CO, HC, NOx and smoke of 4 types of domestic-use diesel engines under various conditions. The emission of CO, HC and NOx tested by 6-Mode test method and smoke emission by full load test met the permissible vehicle emission standard. Pollutant emission rates of diesel engines were different according to engine operating conditions, that is, engine load and engine speed. Generally, CO and HC was emitted more at low load and NOx at high load but the trend was quite different by the type of engines. In exhaust gas, $NO_2$ portion of NOx emission was high, specially at low speed and low load. The correlation equation between CLD(NOx) and NDIR(NO) method of nitrogen of nitrogen oxides analysis was y = 1.10x - 3.48 (y: CLD method) as a result of 6-mode test.

• Journal of Korean Society for Atmospheric Environment
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• v.14 no.5
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• pp.455-464
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• 1998

Removal teals of Soxmox were performed using low density ceramic filters doped with various catalysts. Disc type (50 mmO.Dx10 mmt) low density ceramic filters were doped with three different catalysts such as Cu to remove SOx and NOx, and Mn and Co to remove NOx. The air permeabilities and specific surface areas were 40~50cc/min.cm2.cmH2O and 4.1~8.88 m2/g, respectively. Also, the peak pore sizes of catalyst support were 3~5nm. Tests were focused to search optimum operating temperatures for different catalysts. It was found that as the CuO content increases, SOx removal efficiency was increased. NOx removal efficiencies for Mn, Cu and Co, were 85% at 30$0^{\circ}C$, 90% at 40$0^{\circ}C$ and 90% at 45$0^{\circ}C$, respectively.

• Journal of the Korean Society of Marine Environment & Safety
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• v.2 no.S1
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• pp.77-85
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• 1996

As conservation of global environment has becoming a major outstanding issue of the world, the International Maritime Organization(IMO) has been legislation a convention for prevention of air pollution from ships. By the new convention, use of air pollutants such SOx, NOx, Freon and Halin Gas shall be restricted. In this regards, analysing these requirements of the convention is required as the cinvention will also be applied in restriction of descharging exhaust gases from ships by estsblishing a requirement of Sox and NOx discharged. The purpose of this study is as follows; 1) Introdcuing of the backgrounds of legislating the convention for prevention of air pollution from ships and major contents of the convention and a countermeasuures in the convention by Korea 2) Reviewing by analyzing the influence in domestic industries concernd by restriction of SOx, NOx in exhaust gases and sulpher content of fuel oil 3) Preparing a countermeasure in the convention properly.