As the marine industry is embracing decarbonisation as a fact of life it is now possible to look at the challenge in a new and positive way, profitable decarbonisation. For many years solutions have been available to reduce emissions but it is only recently that the business case to drive this paradygm shift has become clear – one that delivers reduced emissions for retrofits and new build projects and adds real competitive advantage. A strategic approach to this challenge is necessary and will include three components depending on a vessel’s operating profile :
Electrical solutions and their role on vessels has clearly been part of a vessel design for many years, such as Diesel-Electric-propulsion or shaft generators, etc. However, the share of green energy from renewable sources such as wind, water, solar in the land based electrical grid has in recent years increased significantly and will continue to do so. Therefore, by combining this shift in shore based green energy with vessels capable of utilising shore connection will enable vessels to reduce emissions dramatically.
Flexibility was once not a consideration in vessel design and as seen when slow steaming was the favoured solution to reducing emissions for many vessels, this lack of flexibility meant some vessel will never be fully optimised. The use of electrical systems onboard will enable smarter propulsion systems that are more resilient and flexible enough to adapt to future changing needs more easily.
Below are some examples of actual systems for a variety of vessel types.
The hybrid solution of shaft generators, converters, and transformers, includes a 5000 kWh energy storage system, enables zero emissions operation while in port to meet RINA Green Plus class notation and deliver fuel savings.
Shuttle tankers benefit from this flexible solution due to their dynamic positioning (DP) requirement. The power required by DP varies, but the diesel electric solution allows the engine loads to be adjusted depending on environmental factors. By using a diesel electric solution, the engines are used for steaming and DP, which means the total installed power can be reduced. The flexible hybrid solution allows the vessel to operate the engines at their optimal load in DP and steaming by providing peak shaving which removes variable loads and also acts as spinning reserve. This reduces fuel consumption, associated emissions and increases engine maintenance intervals.
With the variable load need for tug operations is ideally suited to a hybrid configuration – offering peak shaving and load balancing so the engines can operate at their optimal level. The hybrid system also allows the tug to run fully electrical in low load conditions in and out of harbour and when waiting and power boost when additional power is needed. Hybrid can also allow smokeless start.
For a fishing vessel with variable loads the hybrid system allows the main engine to run at optimal load and the total installed power can be reduced, this allows the main engine installation to be smaller to match the power needed. The battery and aux engines supply additional power for propulsion boost in harsh weather conditions and offer peak shaving.
The shaft generator system uses a variable frequency converter to provide stable auxiliary power. When the main engine is running on gas, the Shaft Generator allows you to generate the whole electrical power needed onboard with a very good SFOC and close to zero maintenance costs for the SG System.
The technology group Wärtsilä will supply the propulsion machinery for four new fishing vessels being built at Karstensens Shipyard in Denmark. These orders emphasise Wärtsilä’s leading position in delivering propulsion solutions for the fishing sector, and strengthen even further the company’s close relationship with the Karstensens yard. The orders were placed in March 2022.
The 75 metre-long purser/trawler vessels are being built for different owners. Two are for Icelandic fishing and processing companies, namely Skinney-Thinganes and Gjögur, while the other two are for Norwegian owners, Veibust Fiskeriselskap and Ronald Ervik.
Each of these vessels will operate with the highly efficient Wärtsilä 31 main engine. Wärtsilä will also supply the gearbox fitted with ‘take-me-home’ functionality, the controllable pitch propeller (CPP), the propulsion shaft lines including seals and bearings, the shaft generator, and Wärtsilä’s ProTouch propulsion control system.
The Wärtsilä 31 has been recognised by Guinness World Records as being the world’s most efficient 4-stroke diesel engine. Its output power has been increased to 5200 kW, thus enhancing its performance even further.
“We are very familiar with Wärtsilä’s propulsion offering and have opted for their products on many of our newbuild projects. In particular, the Wärtsilä 31’s efficiency and reliability is ideally suited for fishing vessels operating in these challenging North Atlantic waters,” says Kent Damgaard, Director, Karstensens Shipyard.
“Wärtsilä has a long-standing relationship with Karstensens Shipyard and we are proud and pleased to be again selected as the propulsion provider for this series of modern purser/trawlers. Repeat orders are always a good indicator of customer satisfaction, and are a validation of our focus on efficiency, reliability, and environmental sustainability,” adds Jens Karlsson, GM Sales, Large Projects, Wärtsilä Marine Power.
The Wärtsilä equipment is scheduled for delivery to the yard during 2023, and the vessels are expected to be ready for delivery in 2024.
Media contact for more information on this release:
Wärtsilä Marine Power
Tel: +39 342 072 5119
Image caption 1: Vessel #478 HERØYHAV, is being built by Karstensens Shipyard and will be powered by the highly efficient Wärtsilä 31 engine as well as host of Wärtsilä propulsion solutions. © Karstensens Shipyard
Image caption 2: Vessel #480 GJÖGUR, is being built by Karstensens Shipyard and the order emphasises Wärtsilä’s leading position in delivering propulsion solutions as well as strengthen even further the company’s close relationship with the Karstensens yard. © Karstensens Shipyard
Wärtsilä Marine Power in brief
Wärtsilä Marine Power leads the industry in its journey towards a decarbonised and sustainable future. Our broad portfolio of engines, propulsion systems, hybrid technology, and integrated powertrain systems delivers the efficiency, reliability, safety, and environmental performance needed to support our customers. Our offering includes performance-based agreements, lifecycle solutions, and an unrivalled global network of maritime expertise.
Wärtsilä in brief
Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. We emphasise innovation in sustainable technology and services to help our customers continuously improve their environmental and economic performance. Our dedicated and passionate team of 17,000 professionals in more than 200 locations in 68 countries shape the decarbonisation transformation of our industries across the globe. In 2021, Wärtsilä’s net sales totalled EUR 4.8 billion. Wärtsilä is listed on Nasdaq Helsinki.