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MAN DEVELOPS EGR FOR LOW-PRESSURE DUAL-FUEL TWO-STROKE

MAN DEVELOPS EGR FOR LOW-PRESSURE DUAL-FUEL TWO-STROKE

Tuesday, November 24, 2020 

MAN Energy Solutions has announced that it is to offer its proprietary EGR (Exhaust Gas Recirculation) system as an emissions solution for its low-speed ME-GA engine, the Otto-cycle variant of the ME-GI dual-fuel engine.

EGR ensures IMO Tier III-compliance in both diesel and gas mode. The company has long experience with this technology and reported the first order for an EGR system in 2011 when it was fully integrated within the MAN B&W 6S80ME-C9 main engine of a 4,500 TEU containership newbuilding.

Thomas S Hansen, Head of Promotion and Customer Support, MAN Energy Solutions, said: “Nine years have passed since our very first EGR system passed its Factory Acceptance Test, and the knowledge we have subsequently gained in the field has led to today’s fully-mature solution. Our EGR system not only achieves NOx-compliance, but also delivers a performance upgrade for both conventional and now ME-GA engines.”

MAN Energy Solutions reports that EGR will enable the ME-GA to reduce specific gas consumption by about 3%, and fuel-oil consumption by 5%. It will also significantly reduce methane slip by 30% to 50% and solve the issue related to pre-ignition on Otto-cycle engines.

Hansen continued: “With our hard-earned experience – added to the rigorous testing that all our EGR systems undergo – we are the de-facto market leader and play a vital role in decarbonising the maritime industry. Our robust EGR solutions fully integrate with other ship systems and are easily integrated with the ME-GA engine.”

MAN Energy Solutions expects to be able to offer the ME-GA EGR solution by end 2021. The ME-GA EGR is a high-pressure system, which can be integrated into existing engine-room designs, and the EGR unit itself does not change the engine footprint. Its design-similarity to that of ME-C engines’ EGR systems will lower its price point, since the supply chain and components are already matured. The EGR system works through drawing around 30% to 50% of the engine’s exhaust gas into the EGR receiver, where it passes through a pre spray to lower its temperature, before passing through a cooler spray. After passing through a water-mist catcher, the gas then goes through a blower to increase pressure back up to scavenging air pressure, before being fed back into the compressor and the engine. The volume requirements of the ME-GA EGR system are significantly lower with, for example, less pipework required than for low-pressure EGR solutions.

Introducing an EGR solution also improves the stability of the combustion process. MAN Energy Solutions is currently researching how far it can lower methane slip while maintaining a good equilibrium with recirculation. MAN Energy Solutions expects the ME-GA to deliver a low CAPEX solution aimed at certain vessel types and applications – such as LNG carriers – that are able to use ‘boil-off’ gas as a source of fuel, or smaller ships where low capital outlay is a priority.

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