Transient Simulation of a Large Two-Stroke Marine Diesel Powerplant Operation with a High Pressure SCR Aftertreatment System

Authors

Michael Ι. Foteinos, Prof. Nikolaos P. Kyrtatos,
National Technical University of Athens, Athens

Summary

The IMO Tier III legislation concerning nitrogen oxide (NOX) emissions from marine engines has compelled engine designers to apply new technologies for NOX abatement. Selective Catalytic Reduction (SCR) is a promising aftertreatment technology that enables compliance with the new rules. However, due to the large size of these engines the size of the SCR reactor is quite considerable (comparable to the size of the engine). As a result, the large thermal inertia of the SCR system has a detrimental effect on the transient and low load operation of the engine. Since the current number of SCR vessels is low and engine testing is expensive, having a fast and reliable model would be useful in order to study the SCR transient behaviour. In this paper, the transient response of a two-stroke marine diesel engine equipped with a High Pressure SCR system is studied. Each part of the propulsion system is modelled, namely, the main engine, the SCR unit, the propeller and the hull of the ship. The prediction capability of the entire model is validated by comparing model predicted results against on-board measured data available from a sailing vessel. The complete propulsion system model makes it possible to study the performance of the SCR system under various transient loading conditions.

Members Login