MAN Diesel & Turbo and its licensee, Mitsui Engineering & Shipbuilding, announced that introduced its new high-pressure Selective Catalytic Reduction system – MAN SCR-HP. MAN Diesel & Turbo expects to deliver the first system from the beginning of 2018.
According to the company, the MAN SCR-HP is available for two-stroke engines of all bore sizes and reduces NOx exhaust emissions to IMO Tier III limits, through internal catalytic reaction. The system was developed based on MAN’s competence with four-stroke engines and it comes in six frame-sizes, covering up to 25 MW per reactor. Larger engines will require two reactors, which can be arranged in a multi-setup similar to turbochargers.
The SCR-HP 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.
Dr. Gunnar Stiesch, Vice President MAN Diesel & Turbo and Head of Engineering Engines, said: “The reactor design has been driven by the desire to reduce the SCR system’s overall size, while still maintaining the effectivity of a much larger design. Reaching this target was only possible by focussing on key cornerstones of the design – the honeycombs as well as the reactor concept.”
The MAN SCR-HP received an 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.
The system consists one of the company’s two suggesting methods to meet IMO Tier III NOx requirements for its two-stroke engines. The selective catalytic reduction (SCR), is an after-treatment method that uses a catalyst and an additive to reduce the NOx generated by the combustion process.
