Transient Response of a Large Two-Stroke Marine Diesel Engine Coupled to a Selective Catalytic Reduction Exhaust Aftertreatment System

Φωτεινός, Μιχαήλ Ι.; Foteinos, Michael I.

dc.contributor.author	Φωτεινός, Μιχαήλ Ι.	el
dc.contributor.author	Foteinos, Michael I.	en
dc.date.accessioned	2020-03-09T12:15:27Z
dc.date.issued	2020-03-09
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/49890
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.17588
dc.rights	Αναφορά Δημιουργού-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nd/3.0/gr/	*
dc.subject	Μοντελοποίηση κινητήρα	el
dc.subject	Επιλεκτική καταλυτική αναγωγή	el
dc.subject	Πρόωση πλοίου	el
dc.subject	Engine modelling	en
dc.subject	Selective Catalytic Reduction	en
dc.subject	Marine Propulsion	en
dc.subject	Θερμική αδράνεια καταλύτη	el
dc.subject	Catalyst thermal inertia	en
dc.title	Transient Response of a Large Two-Stroke Marine Diesel Engine Coupled to a Selective Catalytic Reduction Exhaust Aftertreatment System	en
dc.title	Μεταβατική Απόκριση Μεγάλου 2-Χ Ναυτικού Κινητήρα Diesel Εφοδιασμένου με Σύστημα Απορρύπανσης Καυσαερίων Επιλεκτικής Καταλυτικής Αναγωγής	el
dc.contributor.department	Εργαστήριο Ναυτικής Μηχανολογίας	el
heal.type	doctoralThesis
heal.secondaryTitle	Transient Response of a Large Two-Stroke Marine Diesel Engine Coupled to a Selective Catalytic Reduction Exhaust Aftertreatment System	el
heal.classification	Ναυτική Μηχανολογία	el
heal.classification	Marine Engineering	en
heal.dateAvailable	2021-03-08T22:00:00Z	en
heal.language	en
heal.access	embargo
heal.recordProvider	ntua	el
heal.publicationDate	2019-12-09
heal.abstract	Large two-stroke marine diesel engines are used as the prime mover in the majority of ocean going commercial vessels. With a view of reducing the environmental footprint of the marine sector, the International Maritime Organization has enacted regulations which set strict limits on the emitted NOx emissions from marine engines, also known as IMO Tier III. Selective Catalytic Reduction (SCR) is an exhaust aftertreatment technology which allows compliance with the new emission standards. Due to the need of high exhaust gas temperatures for proper SCR operation, in marine two-stroke applications the SCR system is placed upstream of the turbine, i.e. between the engine and the turbocharger. This disrupts the coupling between the engine and the turbocharger introducing challenges on the transient operation of the engine. Due to the large thermal inertia of the SCR system, the turbocharger responds to an engine load change with a significant time delay, which in low load engine operation might lead to thermal instability of the system. Researchers underlined the system’s susceptibility to thermal instability and proposed complicated solutions to ensure the system’s robust operation, such as Variable Turbine Geometry. This thesis investigates the transient response of a large two-stroke marine diesel engine, without turbocharging variability, coupled to a SCR exhaust aftertreatment system. The objective of the thesis is to investigate the effect of the high pressure SCR system on the transient response of the engine with focus on low load operation. Due to the high cost involved in large engine testing the investigation was carried out via modelling and simulation. Zero dimensional models were developed for the propulsion engine and the SCR system. The engine was modelled in the NTUA in-house engine process simulation code and validated against available steadystate measurements from the engine’s shop trials. Moreover, a SCR model was developed to take into account the temperature dynamics of the SCR system and was integrated with the engine model. The SCR model was validated against available measured data from a full scale engine-SCR testbed. In transient loading conditions, the load that the engine has to overcome, i.e. the propeller load, is not known a priori, but is dependent on the complex interactions between the engine, propeller and the ship’s hull. In order to obtain an accurate prediction of the engine load during load transients, models for the propeller and the ship’s hull were also developed and integrated with the engine and SCR models. The coupled model of the propulsion system was validated under transient loading conditions using available on-board measured data from a commercial vessel. Simulations of the propulsion system under transient loading were carried out under both calm and heavy weather conditions. Results showed that the transient response of the engine is indeed affected by the presence of the SCR system and the effect is more pronounced at the lower engine load region. However, thermal instability of the system can be averted and the system is able to operate even during very low load operation.	en
heal.sponsor	Horizon 2020 , European Union’s Hercules-2 research and innovation project	en
heal.advisorName	Κυρτάτος, Νικόλαος
heal.advisorName	Kyrtatos, Nikolaos
heal.committeeMemberName	Κυρτάτος, Νικόλαος	el
heal.committeeMemberName	Παπαλάμπρου, Γεώργιος	el
heal.committeeMemberName	Σπύρου, Ιωάννης	el
heal.committeeMemberName	Μπελιμπασσάκης, Κωνσταντίνος	el
heal.committeeMemberName	Σαμαράς, Ζήσης	el
heal.committeeMemberName	Καϊκτσής, Λάμπρος	el
heal.committeeMemberName	Σταματέλος, Αναστάσιος	el
heal.academicPublisher	Σχολή Ναυπηγών Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.fullTextAvailability	false