Development of SCR thermal model and performance of transient simulations with an engine simulation code

Konstantinidis, Stavros; Κωνσταντινίδης, Σταύρος

dc.contributor.author	Konstantinidis, Stavros	en
dc.contributor.author	Κωνσταντινίδης, Σταύρος	el
dc.date.accessioned	2018-08-28T07:49:42Z
dc.date.issued	2018-08-28
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/47452
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.15681
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Selective catalytic reduction	en
dc.subject	SCR thermal model	en
dc.subject	Engine model	en
dc.subject	Marine diesel engine	en
dc.subject	High-pressure SCR	en
dc.subject	Επιλεκτική καταλυτική αναγωγή	el
dc.subject	Μοντέλο προσομοίωσης κινητήρων	el
dc.subject	Θερμικό μοντέλο επιλεκτικής καταλυτικής αναγωγής	el
dc.subject	Υψηλής πίεσης SCR	el
dc.subject	Προσομοιώσεις μεταβατικού φορτίου	el
dc.title	Development of SCR thermal model and performance of transient simulations with an engine simulation code	en
heal.type	bachelorThesis
heal.classification	Marine engineering	en
heal.dateAvailable	2019-08-27T21:00:00Z
heal.language	el
heal.language	en
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2018-06
heal.abstract	The present Thesis focuses on the development of an SCR thermal model that can accurately predict the temperature dynamics of an SCR system installed on a marine diesel engine. Steady and transient simulations for a two-stroke marine diesel engine equipped with an SCR system are performed in order to investigate the effect of the installed valves on the engine operation. Legislation concerning pollutants and in particular nitrogen oxides (NOx) abatement is briefly presented in Chapter 1, emphasizing on the latest IMO Tier III regulations and the changes they introduce. The objective and the outline of the Thesis are also presented. In order to reduce high NOx concentration in the exhaust gases and comply with the latest strict limits, there are two proven technologies. The first one is the EGR (Exhaust Gas Recirculation) technology and the other is the SCR (Selective Catalytic Reduction) technology. Despite the fact that both of them are already established technologies for power plants and truck engines, many challenges arise from their applications in large two-stroke marine diesel engines. In Chapter 2, a brief description of the basic principles of EGR is followed by a thorough description of SCR working principles. SCR can be placed downstream or upstream the turbine depending on the application, with each placement having its own advantages. Concerning marine diesel engines, SCR placement upstream the turbine is mandatory. In order to study the thermal response of a marine SCR aftertreatment system in transient loading of a two-stroke marine diesel engine, an SCR model is developed and validated using measurements from a full scale engine-SCR testbed. It is assumed that SCR consists of three parts: vaporizer, intermediate pipe and reactor. The equations that approach the aforementioned modeling are partial differential equations (pde), which are solved in time using two methods: an explicit and an implicit method. Each one has its own advantages and disadvantages. The output of the model is the SCR outlet temperature. The above mentioned models were validated using testbed measured data from a large two-stroke marine diesel engine. The validation process included tests both in steady and transient engine loads. Validation was followed by the connection of the SCR model to an existing engine simulation code (MOTHER) and the performance of steady and transient simulations. The effect of the onboard valves on the operation of the engine was investigated.	en
heal.advisorName	Κυρτάτος, Νικόλαος	el
heal.committeeMemberName	Καϊκτσής, Λάμπρος	el
heal.committeeMemberName	Παπαλάμπρου, Γεώργιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών. Τομέας Ναυτικής Μηχανολογίας. Εργαστήριο Ναυτικής Μηχανολογίας	el
heal.academicPublisherID	ntua
heal.numberOfPages	90 σ.	el
heal.fullTextAvailability	true