Nitrogen oxides (NO(x)) are mainly generated by combustion of fossil fuels used for marine vessels. Nowadays, a consensus has been reached internationally to limit emission of air-polluting compounds. And the NO(x) emission level requirements of marine diesel engine are getting more stringent these days. Especially to meet the Tier III requirement of IMO MPEC 58, external flue gas treatment system may be necessary as the requirements can not be met by NO(x) reduction system in diesel engine boundary. One of the possible solutions of the NO(x) reduction could be the Selective Catalytic Reduction (SCR) type De-NO(x) system. However, it is well known that the SCR performance is greatly affected by the flue gas temperature and the existence of sulfur contents and that the temperature of exhaust gas from the marine diesel engine is relatively low and sulfur components are detrimental to the catalyst. In marine diesel oil, some amount of sulfur is contained in most of the cases. The typical contents of the sulfur in marine fuel oil could be 1.0 -4.5% range. It is believed that the allowable sulfur level contained in fuel oil will be gradually reduced. Nevertheless, the complete removal of the sulfur in fuel oil is impractical due to high desulfurization cost in the process of fuel oil production. With the reason, the De-NO(x) system which can be operated in the existence of some range of sulfur, typically 1% in fuel oil, might be practically implemented in the marine diesel engine in the near future. Daewoo Shipbuilding and Marine Engineering Co., Ltd. (DSME) and BW Group are developing 'Sulfurtolerant SCR type De-NO(x) system for Marine Applications'. We have evaluated the durability and optimum conditions for NO(x) reduction performance using selected commercial catalysts and have developed SCR catalyst suitable for low temperature and existence of SO(x) contents with a manufacturer specialized in the SCR catalyst. The influences of the SO(x) contents and dust for the developed SCR have been compared by extensive experiments. For the verification of the developed SCR, bench scale test facility has been utilized. With the facility, various performance comparisons of SO(x) and dust have been achieved. The test has been carried with the collaboration of Institute of Advanced Engineering (IAE). In addition to the bench scale test, we have been selected optimum combination of catalyst and SCR operational variables with the aid of computational fluid dynamics (CFD). Through the studies, we expect sulfur-tolerant SCR element and practical De- NO(x) system for marine applications would be developed. Based on the results obtained from the test and CFD analysis, detail engineering design and actual onboard tests will be carried out for targeted vessel. We expect the developed De-NO(x) system would contribute to the emission reduction in the marine industry.
Development of sulfur-tolerant SCR type De-NO(x) system for marine applications
2010
8 Seiten, 18 Bilder, 2 Tabellen, 1 Quelle
Conference paper
Storage medium
English
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