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Evaluation of Emission Factors on the Estimation of NOx Formation from a Manoeuvring Ship

Lookup NU author(s): Dr David Trodden, Dr Alan J Murphy, Dr Kayvan Pazouki


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Oxides of Nitrogen (NOX) are particularly harmful to human health, as such their emissions are closely monitored and controls are becoming increasingly stringent, especially in Emission Control Areas. Currently NOX control is achieved through the survey and certification requirements, as well as demonstration of in-service compliance. A mechanism to estimate in-service compliance allows designers to play out scenarios and study the impact of ship operations on the environment, including at the design stage. One potential route to achieve this is the use of Emission Factors, however several types exist and can generate quite different results. The reason for this discrepancy is due to NOX formation being dependent upon engine operating conditions, and different Emission Factors treat this aspect in different ways. As NOX is dependent upon engine running conditions, and therefore ship operation, it is worthwhile evaluating the different Emission Factors on NOX formation, especially as ships tend to spend more time in manoeuvring conditions around population dense areas such as inland waterways, ports and harbours. The emission factors examined range from constant across the whole range of engine loads, constant across different modes of operation, to variable as a function of power and speed. It is suggested that Emission Factors which account for engine running conditions better represent reality compared to constant factors. This paper describes the use of a ship manoeuvring simulator in conjunction with different Emission Factors to investigate the magnitude in deviation of NOX emissions from standard ship manoeuvres.

Publication metadata

Author(s): Trodden DG, Murphy A, Pazouki K

Editor(s): Osman Turan, Charlotte Banks, Ben Howett

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Shipping in Changing Climates 2015

Year of Conference: 2015

Print publication date: 24/11/2015

Online publication date: 24/11/2015

Acceptance date: 26/10/2015