Yanmar unveils its latest weapon against emissions

Yanmar Marine International has officially launched its Selective Catalytic Reduction (SCR) system. It’s designed to significantly cut NOx emissions from commercial vessels with engines exceeding 130kW in Emission Control Areas (ECAs).

“What we have created with this SCR system is an easier and simpler way to significantly reduce NOx emissions,” says Bas Eerden, global sales manager.

“The system’s uses go beyond adhering to regulations and utilises the latest technology to make a very significant reduction in emissions, which is the aim of all our solutions. This is in line with the Yanmar Green Challenge initiative to reduce emissions globally.”

Yanmar’s SCR meets the International Maritime Organisation’s (IMO) Tier III emission standards. These apply to marine diesel engines operating in ECAs. Yanmar says the system provided a 60-90 per cent reduction of NOx, depending on loading conditions and temperature.

SCR can also be fitted to leisure vessels (larger than 24 metres). A J Class sailing yacht was recently fitted with SCR although the system is not intended for use in the USA. (In the US there is an additional layer of testing which the system currently does not comply with.)

Recently Eerden told MIN that SCR will not receive a global market rollout, but rather will be focused on regions where the system is applicable and where compliance is compulsory. 

“However, we anticipate that more areas and countries will adopt similar emission requirements in the future. The SCR system (pictured left) is primarily targeted at commercial vessels and leisure boats over 24 metres, in accordance with International Maritime Organization’s (IMO) Tier III emission standards in Emission Control Areas,” reiterates Eerden.

Technical details from Yanmar about its SCR

The emissions control system, paired with the common rail technology used in Yanmar’s combustion engines, uses a number of sensors to measure temperature and NOx before it enters the catalyst.

An ECU calculates the correct volume of Diesel Exhaust Fluid (DEF), also known as AdBlue, which needs to be injected. That then binds with the NOx, reducing emissions down to near-zero levels. The system pairs with Yanmar’s 6LY series of engines, between 400-440HP.

A key design feature of Yanmar’s SCR is its size and weight. It’s smaller than other systems on the market and weighs only 86KG. This makes it significantly easier to retrofit.

For colder regions with the Emission Control Areas, such as the Nordics and Baltics, Yanmar offers an optional heater kit for the DEF to remain at a certain temperature to prevent crystallisation (occurring at -13oC).

More details can be accessed on Yanmar’s website.

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