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A diesel engine is utilized widely for industry and shipping because of its efficiency. However, diesel engine emits relatively high concentrated air pollution matters, which will become a competitive factor in the shipping as well as industry. In fact, the regulation has been already implemented from the year 2000. Nitrogen oxides (NOx) in particular is the main part of the regulation. IMO NOx levels are generally possible to meet by means of primary on-engine measures so called IMO tuning. But further significant follow-on reductions are likely to require a secondary after-treatment technique.
SCR technology is used almost exclusively for NOx removal in stationary combustion systems. SCR system is currently the only available technology proven at full scale to meet the 90% NOx reduction levels. Accordingly, the use of an SCR system on board ship maybe provides the solution to minimize this primary pollutant without increasing fuel consumption.
In order to develop a practical SCR system for marine application on board ship, a primary SCR system using urea was made. The SCR system was set up on the ship, HANNARA as a test vessel, employed a two-stroke cycle diesel engine as main propulsion, which is a training ship in KMU (Korea Maritime Univ.). The purpose of this paper is to report the results about the basic effects of the above system parameters which is investigated from practical application through its trial use. The preliminary results are presented that the degree of NOx removal depends on some parameters. such as the amount of urea solution added, space velocity, reaction gas temperature and activity of catalyst.

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Abstract

1.머리말

2.SCR 시스템의 NOx 정화과정

3.실험장치의 구성

4.실험결과 및 고찰

5.결론

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UCI(KEPA) : I410-ECN-0101-2009-559-014135867