First LPSCR Scheme B certification for MAN B&W two-stroke engine

The world's first Scheme B certification for a two-stroke diesel engine was conducted for a tanker fitted with a MAN B&W S35MC in combination with HSD Engine’s low pressure SCR system ‘DelNOx’ (pictured). (Credit: HSD Engine) The world's first Scheme B certification for a two-stroke diesel engine was conducted for a tanker fitted with a MAN B&W S35MC in combination with HSD Engine’s low pressure SCR system ‘DelNOx’ (pictured). (Credit: HSD Engine)
Industry Database

A major milestone has been reached after the world's first IMO SCR Scheme B emission certification was undertaken on a MAN B&W two-stroke engine retrofitted with Low Pressure SCR (LPSCR).

The world’s first SCR Scheme B procedure for a two-stroke engine for main propulsion was undertaken by MAN Energy Solutions together with Korean SCR supplier HSD Engine and classification society DNV GL.

The Scheme B certification was conducted for a tanker fitted with a MAN B&W S35MC two-stroke diesel engine in combination with HSD Engine’s low pressure SCR system ‘DelNOx’.

The SCR Scheme B emission certification method is an equivalent method to the conventional certification procedure according to Scheme A, where the engine fitted with SCR is measured as a combined unit on a test bed. Under Scheme B, the emission test of SCR catalyst and engine is performed separately. This leads often to the fact that the two units will see each other first time on the vessel.

The Scheme B method requires therefore that the predicted NOx reduction rate from the model-test is confirmed on board by a so-called on board confirmation test.

DNV GL was involved in this project from the early stages, as the SCR scaling model was developed and preparations for the scaled SCR chamber test at the laboratory of HSD Engine were made. During the model test at the laboratory at HSD Engine, DNV GL performed a detailed survey of the setup and model testing.

First of kind retrofit project

The advantage in applying the Scheme B method is that the emission test of SCR catalyst can be performed on a scaled model in a laboratory, instead of a full-size installation on a test bed. This is particularly appropriate for retrofitting, when an SCR Tier III full system test on a test bed is impractical.

The Scheme B method requires that the predicted NOx reduction rate from the model-test is confirmed on board by a so-called on board confirmation test.

In this first of its kind retrofit project, the efficiency of the Scheme B method could be demonstrated to the full satisfaction of the class society. The predicted NOx reduction rate of the SCR catalyst was successfully confirmed by on-board measurements.

“New streams of opportunities”

“This development opens up new streams of opportunities for MAN and for ship owners looking to retrofit the latest Tier III technology to their existing vessel fleet,” said Michael Witt, head of Retrofit Development in MAN ES’ Research and Development department.

Philipp Simmank, Emission Certification Expert in Retrofit Development at MAN ES, noted the successful implementation of the SCR Scheme B certification method benefited from close cooperation with the experts at HSD Engine as well as at DNV GL.

The Scheme B method as described in the latest revision of the SCR guidelines, developed at the IMO Marine Environmental Protection Committee (MEPC), has proven its full practicability after this project, Simmank added.

Completing the full systems test onboard rather than on a test bed achieved time savings of 2-3 weeks of test bed time. But the overall savings of effort in undertaking emission tests of SCR catalyst and engine separately are much greater. “Allowing the two units to see each other for the first time on the vessel saves valuable project time,” concluded Witt.

Witt noted that further development efforts will be applied to apply that Scheme B certification method to a High-Pressure SCR (HPSCR). “We expect Scheme B certification for emission reduction technology retrofitting will be used as the best practice example for many more follow-up projects.”

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