The IMO (International Maritime Organisation) has decided that the allowable NOx emissions limits for new engines which will be in the new annex of MARPOL and these limits will be enforced for new ship designs in 1998. There have been many discussions about reducing the NOx emitted from marine engines and several methods for NOx reduction have been proposed dy diesel engine designers based on the emission level of existing engines. Delayed fuel oil injection timing (timing retard) is considered to be effective for the first step of IMO regulation and for more stringent requirements, stratified fuel-water injection systems and/or selective catalytic reduction methods are proposed. For environmental protection, it is essential to use NOx reduction techniques. However, complications are expected with new ship machinery construction and arrangement when installing de-NOx equipment. Ship's machinery designers must minimize disadvantages of operability, economy and safety as far as possible. This paper gives a brief outline of the de-NOx techniques and discusses the problems when it is installed in ships.
Study of machinery design for ship's low NOx plant
Studie des rechnergestützten Entwurfs eines Schiffsantriebs mit geringer NOx-Emission
1995
6 Seiten, 10 Bilder, 1 Quelle
Conference paper
English
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