Wärtsilä unveils a novel engine exhaust noise reduction system that could eventually make conventional single unit diesel engine silencers a thing of the past.
Designed for applications where little or no engine noise is an operational requirement, such as passenger ships and ferries, offshore and military vessels, Wärtsilä’s Compact Silencer System (CSS) is a patented method for designing the complete exhaust systems using multiple silencer elements distributed along the exhaust pipe.
The new system can also help ship owners reduce operating costs because it negates the need for adding more conventional silencers.
A conventional silencer is unable to reduce noise across the entire frequency spectrum because engine noise frequencies vary depending on the number of cylinders and so on. There are also external factors affecting the engine’s noise level, such as exhaust gas pipe design, amounts of bends, equipments like SCR, Boiler etc.
As a result additional silencers are usually added, but this could prove detrimental to the engine. The introduction of further conventional silencers can increase the exhaust gas pressure drop, increasing the thermal load on the engine. Not only can this actually damage the engine, fuel consumption increases too.
The CSS concept, however, covers the whole frequency spectra whilst maintaining a low pressure drop – an advantage since the introduction of exhaust gas cleaning equipment, such as SCRs and scrubbers, are likely to further increase the exhaust gas back pressure if conventional engine noise systems are used.
Where low weight, low centre of gravity and space is of concern, CSS components have been optimised to minimise the space requirement of the exhaust system. Pre-insulated silencer elements, for instance, are designed to have almost the same diameter as the insulated exhaust gas pipe.
Acoustic properties are optimised according to operational and regulatory noise level requirements, and although the final solution selection depends mainly on the demand for noise reduction demand, allowable piping length and ship compartments, the CSS offers a more slender, lighter cost-effective solution compared to single unit systems. It is easy-to-install, acoustically robust, reduces pressure drop and, importantly, noise.
We also welcome your visit to SMM exhibition in Hamburg, Germany, Wärtsilä stand – No. 223 in Hall A4!
Ms Marit Holmlund-Sund
Public Relations Manager
Direct tel: +358 10 709 1439
Direct fax: +358 10 709 1425
Wärtsilä Corporation in brief:
Wärtsilä enhances the business of its customers by providing them with complete lifecycle power solutions. When creating better and environmentally compatible technologies, Wärtsilä focuses on the marine and energy markets with products and solutions as well as services. Through innovative products and services, Wärtsilä sets out to be the most valued business partner of all its customers. This is achieved by the dedication of more than 17,000 professionals manning 160 Wärtsilä locations in 70 countries around the world. Wärtsilä is listed on The Nordic Exchange in Helsinki, Finland.