MAN Energy Solutions’ Two-Stroke Business has received over 1,000 orders for its Tier III NOx-abatement technologies for its portfolio of MAN B&W two-stroke engines sinceJanuary 2021, the company has revealed. In all, the company has now booked more than 2,000 orders for its IMO MARPOL Annex VI Tier III-compliant solutions.
Some 64% (or 1,292) of the 2,016 orders were SCR solutions, while 36% (724) were EGR solutions. The company added that the EGR total included67 engines equipped with EcoEGR, a tuning method that lowers fuel consumption by recirculating a small amount of exhaust gas while operating in Tier II.
The company revealed that orders associated with 50- and 60-bore MAN B&W engines accounted for the largest proportion of NOx solutions (37%), from a bore-size perspective.
Bjarne Foldager – Senior Vice President and Head of Two-Stroke Business – MAN Energy Solutions, said: “This welcome milestone is built on the experience we have gathered over the past decade. Our fully-mature EGR and SCR systems deliver Tier III NOx-compliance and improve engine performance in terms of increased fuel efficiency and lower, general emissions. Our ability to treat a ship as a complete system gives us a clear market advantage that enables us to prioritise environmental considerations and system integration.”
In relation to EGR, Stig B. Jakobsen – Senior Manager, Two-Stroke Operation – MAN Energy Solutions, said: “More than ten years of service experience with our EGR design has enabled us to introduce refinements and optimisations. The latest design is a perfect example of such optimisation since we employ our fourth-generation EGR in our low-pressure, dual-fuel ME-GA engine. EGR has become an integral tuning tool for each of our low-speed engines and its maturity will allow us to further explore the potential for optimising engine performance well into the future.”
NOx solutions
Exhaust Gas Recirculation (EGR) prevents the formation of NOx by controlling the combustion process, while Selective Catalytic Reduction (SCR) uses a catalyst and an additive to remove the NOx generated by the combustion process as an after-treatment process.
Uniquely for the two-stroke sector, MAN Energy Solutions offers both EGR and SCR as proprietary NOx solutions. The company has long experience with EGR technology and reported its first order already in 2011, while its own in-house-developed SCR-HP (-High Pressure) won its first order in January 2019. This features a drastically reduced reactor-size, compared to rival systems, to which MAN Energy Solutions has been providing system approval since 2014.
Methanol-fuelled, MAN B&W LGIM engines have a special feature as explained by Kjeld Aabo – Director of New Technologies – MAN Energy Solutions: “Through the use of water emulsion in the methanol, we are able to reach Tier III levels in methanol fuel-mode, completely removing the need for a dedicated NOx-abatement technology. Our introduction of this on our G50-LGIM engine gains us highly valuable service experience – especially in the methanol-carrier segment – while we see a very clear demand for full Tier III-compliance across all fuel types outside this segment by means of EGR.”
