MAN Diesel & Turbo has presented its new high-pressure Selective Catalytic System (SCR), MAN SCR-HP, to the market.
It is available for two-stroke engines of all bore sizes. The intention is to reduce NOx exhaust emissions to IMO Tier III limits with the internal catalytic re[ds_preview]action. With specially developed honeycombs and honeycomb materials, as well as an integrated mixing unit, the overall size of the reactor has been drastically reduced compared to typical market designs and its medium-speed counterpart, MAN stated. The company expects to deliver the first system from the beginning of 2018.
The development of the SCR-HP system was based on MAN’s in-house competence with four-stroke engines, for which it can already reference more than 650,000 operating hours. The newly-developed system comes in six frame-sizes, covering up to 25 MW per reactor. A major milestone in the development was reached during the approval certification and engine shop test. The test was carried out in close collaboration with MAN licensee and partner, Mitsui Engineering & Shipbuilding, at its engine works in Tamano under the observation of ClassNK.
Six frame sizes for SCR-HP
The SCR-HP comes in six frame sizes, covering engines up to 25 MW with one reactor for the entire exhaust stream. Larger engines will require two reactors, which can be arranged in a multi-setup similar to turbochargers.
The SCR-HP system consists of the reactor – including mixing unit, urea injection lance, honeycombs and soot blowers – along with a module-based supply system, as well as the reactor’s control unit that communicates with the engine-control system.
The SCR-HP system is available for Scheme A and Scheme B classification approval. Scheme A approval includes a certification of the complete system on the engine test bed, SCR and original piping. Approval via Scheme B reduces complexity for all involved parties. Over 100 systems are already in the order book awaiting Scheme B certification.
