Research Papers

Simulation of the Transient Thermal Response of a High Pressure Selective Catalytic Reduction Aftertreatment System for a Tier III Two-Stroke Marine Diesel Engine

[+] Author and Article Information
Michael I. Foteinos

Laboratory of Marine Engineering,
National Technical University of Athens,
P.O. Box 64501, Zografou Campus,
Athens 15704, Greece
e-mail: m.foteinos@lme.ntua.gr

Stavros K. Konstantinidis

Laboratory of Marine Engineering,
National Technical University of Athens,
P.O. Box 64501, Zografou Campus,
Athens 15704, Greece
e-mail: skonstantinidis@lme.ntua.gr

Nikolaos P. Kyrtatos

Laboratory of Marine Engineering,
National Technical University of Athens,
P.O. Box 64501, Zografou Campus,
Athens 15704, Greece
e-mail: nkyrt@lme.ntua.gr

Kræn Vodder Busk

MAN Energy Solutions,
Teglholmsgade 41,
Copenhagen 2450, Denmark
e-mail: kraenv.busk@man-es.com

1Corresponding author.

Manuscript received March 19, 2018; final manuscript received November 13, 2018; published online January 10, 2019. Assoc. Editor: David L.S. Hung.

J. Eng. Gas Turbines Power 141(7), 071001 (Jan 10, 2019) (10 pages) Paper No: GTP-18-1136; doi: 10.1115/1.4042131 History: Received March 19, 2018; Revised November 13, 2018

The IMO tier III legislation, applicable to vessels with a keel laying date from Jan. 1, 2016, has compelled engine builders to apply new technologies for NOx abatement. One of the most promising technologies for tier III compliance is the selective catalytic reduction (SCR) of nitrogen oxides (NOx). Despite that SCR technology has been applied in powerplants and heavy duty truck engines for years, there are challenges that stem from its applications in large two-stroke marine diesel engines. In this paper, an SCR model applicable to large two-stroke marine diesel engines is introduced. The goal of the model is to predict the thermal response of a marine SCR aftertreatment system when the engine undergoes transient loading. The model has been developed and validated using testbed measured data from a large two-stroke marine diesel engine. The output of the model is the SCR outlet temperature. It is shown that the model can accurately predict the transient inertial response of the SCR during engine acceleration, deceleration, and low load operation.

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Fig. 1

Selective catalytic reduction drawing. The exhaust gas is guided along the dotted line during SCR operation.

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Fig. 2

Bulk condensation temperatures of ABS at exhaust pressures 1 and 4.3 bar [17]

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Fig. 3

Thermal oscillations on a large two-stroke engine with a high-pressure SCR system (testbed measurements)

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Fig. 4

Sketch of the SCR model where the inputs, outputs, and different components are shown

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Fig. 5

Energy flow in a control volume of the vaporizer

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Fig. 6

Energy flow in a control volume of the reactor

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Fig. 7

Sketch of a marine SCR reactor with its catalyst blocks

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Fig. 8

Model predicted and measured SCR temperatures during low load oscillations

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Fig. 9

Model predicted and measured SCR temperatures during engine deceleration

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Fig. 10

Measured reactor inlet and reactor outlet temperature during deceleration

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Fig. 11

Model predicted and measured SCR temperatures during engine acceleration

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Fig. 12

Reactor inlet and outlet temperature during acceleration from 25% to 75% load

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Fig. 13

Model predicted reactor outlet temperature for different values of catalyst mass

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Fig. 14

Results of performance indexes for various values of the parameters

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Fig. 15

Correlation matrix from between the parameters and the performance indexes



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