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Abstract
Nitrogen oxide (NOx) emissions from marine diesel engines pose a hazard to human health
and the environment. From 2021, demanding emissions limits are expected to be applied
to sea areas that the Royal Navy (RN) accesses. We analyze how these future constraints
affect the choice of NOx abatement systems for RN ships, which are subject to more
design constraints than civilian ships. A weighted matrix approach is used to facilitate
a quantitative assessment. For most warships to be built soon after 2021 Lean Nitrogen
Traps (LNT) in conjunction with Exhaust Gas Recirculation (EGR) represents a relatively
achievable option with fewer drawbacks than other system types. Urea-selective catalytic
reduction is likely to be most appropriate for ships that are built to civilian standards.
The future technologies that are at an early stage of development are discussed.