• Journal of the Korean Society for Marine Environment & Energy
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• v.7 no.2
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• pp.57-63
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• 2004

In this paper, the NOx emission and the reduction technologies of NOx emission for domestic marine diesel engine were investigated. At first, the present production status of domestic marine diesel engines was investigated. In the next, the NOx emission of domestic marine diesel engines was investigated. Finally, the present status of a reduction technologies of NOx emission was investigated. From this investigation, It could be founded that the domestic marine diesel engines satisfied the IMO current NOx regulations, however the higher technologies must be studied to prepare the more severe IMO regulations of the near future.

• Journal of the Korean Society for Marine Environment & Energy
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• v.6 no.3
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• pp.16-25
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• 2003

In this paper, the reduction of green house effect gas CO₂ emission and NOx gas emission by using the RORO ship coastal transport of import-export container cargo was investigated. At first, the domestic CO₂ gas emission and the transportation of import-export container cargo were Investigated. Next, the characteristic of a RORO ship and CO₂ emission standard and NOx emission standard were investigated. And also, the reduction of CO₂ emission and NOx emission by the shift of coastal transport from land transport for the transportation of import-export container cargo between Kyongin area and Pusan Port were calculated. Finally, the change of CO2 and NOx gas emission due to the change of the share of coastal transportation and the load efficiency of RORO ship are investigated. The research results show that the shift of RORO ship coastal transport from land transport was very effective to reduce the CO₂ emission but it was no good to reduce the NOx emission.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.3
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• pp.267-275
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• 2023

The cement industry has been contributing to solve the wastes problem by using various combustible wastes as alternative fuel to replace natural coal. To use more alternative fuels such as waste plastics, in the cement manufacturing process, it is necessary to stably burn alternative fuels and reduce air emissions such as NOx. This study is a case study on the multi-stage combustion calciner process, which is a technology that decreases the amount of NOx while increasing the use of alternative fuels. This study is a case study on the multi-stage combustion process, a technology that reduces the amount of harmful air emissions such as NOx while increasing the use of alternative fuels. Along results of comparing before and after applying the technology to actual cement manufacturing facilities, the amount of coal consumption decreased by 38 %, waste plastics consumption increased by 122 %, and NOx emissions decreased by 17 %. Results show that increasing the use of alternative fuels and reducing NOx emissions by multi-stage combustion is effective.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.447-448
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• 2003

SOx 등과 함께 대기오염 발생에 가장 크게 관여하는 NOx를 제거 하고자 오래전부터 지금까지 많은 연구가 수행되어 왔다. NOx가 배출되는 유형에 따라 발전소, 보일러 및 산업체와 같은 고정원에서 배출되는 경우와 자동차나 선박과 같은 이동원에서 배출되는 두 가지의 경우가 있다. 고정원에서 NOx를 제거하는 가장 효율적인 방법은 암모니아에 의한 NOx의 선택적 제거법(Selective Catalytic Reduction)으로 알려져 있다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.8
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• pp.4729-4735
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• 2014

To protect the environment, the regulation of emissions from off-road engines which are relatively neglected, is being reinforced. This paper deals with the robust design of off-road diesel engines considering the emission characteristics. Measurements of the NOx and PM levels based on the DOE were carried out. The injector hole number, injection timing and EGR rate were selected as the control factors. The orthogonal arrays table $L_9(3^3)$ was made from 2 or 3 levels for each factor and measurements of emissions were accomplished based on the table. The small-the-better SN ratio according to the Taguchi method was evaluated. The ANOVA (analysis of variance) for the SN ratio was conducted. The injection timing on the NOx emissions and the EGR rate on the PM have the largest effect on the low-load operation condition. The confidence levels of the control factors were more than 90%.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.3
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• pp.251-257
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• 2012

This work presents an experimental investigation of NOx emissions according to inlet air temperature (550-660 K), stoichiometric air ratio (${\lambda}$, 1.4-2.1), and elevated pressure (2-5 bar) in a High Press Combustor (HPC) equipped with a double cone burner, which was designed by Pusan Clean Coal Center (PC3). The exhaust-gas temperature and NOx emissions were measured at the end of the combustion chamber. The NOx emissions generally decreased as a function of increasing ${\lambda}$. On the other hand, NOx emissions were influenced by ${\lambda}$, inlet air temperature and pressure of the combustion chamber. In particular, when the inlet air temperature increased, the flammability limit was extended to leaner conditions. As a result, a higher adiabatic temperature and lower NOx emissions could be achieved under these operation conditions. The NOx emissions that were governed by thermal NOx were greatly increased under elevated pressures, and slightly increased at sufficiently low fuel concentrations (${\lambda}$ >1.8).

• 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 Air Pollution Research Association Conference
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• 2001.11a
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• pp.421-422
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• 2001

화력발전소의 보일러를 포함한 모든 연소설비의 NOx배출 규제치가 대기오염 방지를 위해 전 세계적으로 강화되고 있는 추세이다. 정부에서도 배출허용기준을 강화하여 기체연료 사용 발전설비에 대하여 기존 설비의 경우 150ppm(4% $O_2$), 신규 설비의 경우 50ppm(4% $O_2$)이 법적규제치로 설정될 전망이며, 총량규제에 따른 배출량 최소화 정책으로 법적 규제치 뿐만 아니라 배출량의 최소화도 요구되고 있다. (중략)

• Journal of the korean Society of Automotive Engineers
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• v.8 no.4
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• pp.1-12
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• 1986

대기오염의 역사는 산업의 발전과 그 맥락을 같이 한다. 자동차가 대기오염의 한 Source로 주목 을 받기 시작한 것은 1940년대초 LA의 극심한 Smog발생의 원인을 찾으면서 부터이며, 1950년대 에 와서 Haagen Smit박사에 의해 Photo Smog의 Mechamism이 해석되면서 Smog를 유발하는 HC, NOx는 자동차 배출 Gas가 50% 이상을, 유해한 CO는 90%이상을 기여한다는 것이 파명되 어, 1965년 미국 California주에서 자동차에 대한 배출 Gas규제가 최초로 시작되었다. 자동차 배출 Gas로서 규제대상은 HC(타화수소), CO, NOx(질소산화물)이며, 엔진 Crankcase Emission(Blow-by Gas), Tail pipe로부터 배출되는 Exhaust Emission, 그리고 연료 Tank, 기 화기등의 연료계로부터 배출되는 Evaporative Emission에서의 HC, CO, NOx 각 상한치를 규제 하고 있다.

• Journal of Korea Port Economic Association
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• v.31 no.4
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• pp.133-150
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• 2015

This study estimates greenhouse and noxious gas emissions caused by cargo-handling equipment at the Port of Incheon in 2013 by applying the NONROAD Model (U.S. EPA). The port emitted 838.4 tons of NOx and 82,747 tons of CO2. The estimates are 2.4 times higher for NOx and 1.3 times higher for CO2 than those of the Port of Los Angeles. Emissions from general cargo-handling equipment are five times more than those from container cargo-handling equipment. Among the three ports comprising the Port of Incheon, the emissions at the North Port, which handles raw materials for industry are relatively higher than those at the other ports. Compared to the study conducted by Chang et al. (2013, 2014), this study finds that CO2 and NOx emissions per cargo-handling equipment are 10 times higher than the corresponding amounts per ship.