Non-catalytic NOx reduction for marine Diesel engine: an experimental approach

Recent legislation concerning air pollutant emissions from ships (Tier III) has considerably decreased NOx emission limits for recreational ships with less than 500 gross tonnages and greater than 24 m load line length (LLL), the so-called “large yachts”. For these yachts, which adopt multiple Diese...

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Autores principales:	Galletti Anna Maria Raspolli, Frigo Stefano, Antonelli Marco, Pasini Gianluca, Bertetti Paolo, Tocchi Federico
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/8e3bc84d38f9448fa1b9b2f66b13bcbc
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spelling	oai:doaj.org-article:8e3bc84d38f9448fa1b9b2f66b13bcbc2021-11-08T15:18:51ZNon-catalytic NOx reduction for marine Diesel engine: an experimental approach2267-124210.1051/e3sconf/202131207015https://doaj.org/article/8e3bc84d38f9448fa1b9b2f66b13bcbc2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_07015.pdfhttps://doaj.org/toc/2267-1242Recent legislation concerning air pollutant emissions from ships (Tier III) has considerably decreased NOx emission limits for recreational ships with less than 500 gross tonnages and greater than 24 m load line length (LLL), the so-called “large yachts”. For these yachts, which adopt multiple Diesel engines with maximum power ranging from 800 to 2000 kW, the new NOx limit is less than 2 g/kWh. To satisfy that limit, engine makers suggest the adoption of a classic SCR system with urea injection but this methodology, in addition to requiring a large space for installation, does not seem so appropriate for diesel engines of large yachts that normally operate at low power with exhaust temperatures often well below 300 °C, therefore not sufficient to allow the correct functioning of the SCR. The aforementioned circumstances have prompted Sanlorenzo Spa (La Spezia – Italy), one of the world’s leading companies in the production of pleasure boats, to collaborate with the University of Pisa in the study of alternative solutions to SCR systems. Recently there is a great interest in innovative NOx abatement systems, based on the possibility of absorbing NOx molecules into seawater through the utilization of appropriate aqueous solutions containing targeted saline oxidizing agents. The present study describes the first results of a research program aimed to identify, from one side, the best saline oxidizing agent for an aqueous NOx abatement and, from the other, the best washing methodology compatible with the propulsion layouts usually adopted on yachts. In the engine testing laboratories of the Department of Energy, Systems, Territory and Construction Engineering (DESTeC) of the University of Pisa, an experimental apparatus has been created to reproduce the real conditions of underwater engine exhausting. This device was combined with a small 1.2 L direct injection diesel engine. The first results showed a reduction of the NOx emissions of about 27% by using a gas washing with wet scrubber, followed by bubbling in water, using 0.2 molar NaClO saline solutions.Galletti Anna Maria RaspolliFrigo StefanoAntonelli MarcoPasini GianlucaBertetti PaoloTocchi FedericoEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 07015 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Galletti Anna Maria Raspolli Frigo Stefano Antonelli Marco Pasini Gianluca Bertetti Paolo Tocchi Federico Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
description	Recent legislation concerning air pollutant emissions from ships (Tier III) has considerably decreased NOx emission limits for recreational ships with less than 500 gross tonnages and greater than 24 m load line length (LLL), the so-called “large yachts”. For these yachts, which adopt multiple Diesel engines with maximum power ranging from 800 to 2000 kW, the new NOx limit is less than 2 g/kWh. To satisfy that limit, engine makers suggest the adoption of a classic SCR system with urea injection but this methodology, in addition to requiring a large space for installation, does not seem so appropriate for diesel engines of large yachts that normally operate at low power with exhaust temperatures often well below 300 °C, therefore not sufficient to allow the correct functioning of the SCR. The aforementioned circumstances have prompted Sanlorenzo Spa (La Spezia – Italy), one of the world’s leading companies in the production of pleasure boats, to collaborate with the University of Pisa in the study of alternative solutions to SCR systems. Recently there is a great interest in innovative NOx abatement systems, based on the possibility of absorbing NOx molecules into seawater through the utilization of appropriate aqueous solutions containing targeted saline oxidizing agents. The present study describes the first results of a research program aimed to identify, from one side, the best saline oxidizing agent for an aqueous NOx abatement and, from the other, the best washing methodology compatible with the propulsion layouts usually adopted on yachts. In the engine testing laboratories of the Department of Energy, Systems, Territory and Construction Engineering (DESTeC) of the University of Pisa, an experimental apparatus has been created to reproduce the real conditions of underwater engine exhausting. This device was combined with a small 1.2 L direct injection diesel engine. The first results showed a reduction of the NOx emissions of about 27% by using a gas washing with wet scrubber, followed by bubbling in water, using 0.2 molar NaClO saline solutions.
format	article
author	Galletti Anna Maria Raspolli Frigo Stefano Antonelli Marco Pasini Gianluca Bertetti Paolo Tocchi Federico
author_facet	Galletti Anna Maria Raspolli Frigo Stefano Antonelli Marco Pasini Gianluca Bertetti Paolo Tocchi Federico
author_sort	Galletti Anna Maria Raspolli
title	Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
title_short	Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
title_full	Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
title_fullStr	Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
title_full_unstemmed	Non-catalytic NOx reduction for marine Diesel engine: an experimental approach
title_sort	non-catalytic nox reduction for marine diesel engine: an experimental approach
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/8e3bc84d38f9448fa1b9b2f66b13bcbc
work_keys_str_mv	AT gallettiannamariaraspolli noncatalyticnoxreductionformarinedieselengineanexperimentalapproach AT frigostefano noncatalyticnoxreductionformarinedieselengineanexperimentalapproach AT antonellimarco noncatalyticnoxreductionformarinedieselengineanexperimentalapproach AT pasinigianluca noncatalyticnoxreductionformarinedieselengineanexperimentalapproach AT bertettipaolo noncatalyticnoxreductionformarinedieselengineanexperimentalapproach AT tocchifederico noncatalyticnoxreductionformarinedieselengineanexperimentalapproach
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Non-catalytic NOx reduction for marine Diesel engine: an experimental approach

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