De-NOx 저감장치가 온실가스 배출량에 미치는 영향 연구 = A Study on the Effect of De-NOx Device on GHG Emissions

다국어 초록 (Multilingual Abstract)

As increase the number of vehicles, the issue of greenhouse gas that was emitted by them became important. As a result, greenhouse gas (GHG) regulations are being strengthened and efforts are being actively made to reduce greenhouse gas emissions in the automotive industry. In the other hand, regulations for harmful emission of vehicles have been reinforced by step.
Especially, the lastly applied step, so called Euro 6, not only decreased NOx limit down to half of Euro 5 but also introduced real driving emission limit for NOx and PN. It is a challenge for manufacturers to meet the recent GHG regulation as well as the latest emission regulation. To overcome these regulations a De-NOx after-treatment system is being applied to diesel vehicles that are known emitting the lowest GHG among conventional internal combustion engines. At the time of the introduction of Euro 6 emission standard in Korea, in the domestic fuel economy certification test, some diesel vehicles emitted more CH4 than Euro 5 vehicles. As a result, it was confirmed that LNT-equipped vehicles emitted a high level CH4 and the level exceeded the US emission standard. In order to determine the reason, various prior literature was investigated. However, it was difficult to find a detailed study on the methane increase with LNT. In this paper, to determine whether the characteristics of vehicles equipped with LNT the affects the above issue and other greenhouse gases, 6 passenger cars were tested on several emission test modes and ambient temperatures with a environment chamber chassis dynamometer. 2 cars of these were equipped with LNT only, other 2 cars had SCR only, and LNT + SCR were applied to remaining 2 cars. The test result shown that the vehicles equipped with LNT emitted more CH4 than the vehicles with SCR only. Also, CH4 tended to increase as the higher acceleration of the test mode. However, as the test temperature decreases, CH4 tended to decreased.
CO2 was not affected by kinds of De-NOx device but characteristic of the test modes.

참고문헌 (Reference)

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