Solutions for reducing greenhouse gas emissions

Wärtsilä's solutions to reduce greenhouse gas emissions
 Sustainability Solutions

Engine efficiency improvement
High efficiency is important in the control of climate change, and with low emissions our products meet the various environmental regulations. The efficiency of Wärtsilä diesel and gas engines ranges between 42-50%, depending on the engine type.

Gas and multifuel engines
The Wärtsilä dual-fuel (DF) engine is another innovation that has a significant effect on controlling climate change. Thanks to the technology developed by Wärtsilä, our customers can flexibly employ the same engine using various fuels. This also makes it possible to reduce the impact on the environment.

DF engines are used in power plants and for powering a wide range of different kind of vessels. This single solution means that the total CO2 emissions from all our current customers' LNG-carrier applications will be reduced by several millions of tons, when compared to traditional gas transportation. At the same time, the availability of gas will be improved and the environmental impacts of gas transportation will be reduced. For other applications an efficient way to reduce CO2 emissions are the use of biofuels. Wärtsilä engines adapted for biofuel are today in operation both in land based power plants and as main engines in marine applications.

Modernisations and conversion services
Wärtsilä applies new technologies also to its existing products, which makes it possible to further reduce their environmental impact. With the help of our service products, we can improve the efficiency of older engines and reduce their emissions to the same level as those of our newer products. Slow steaming packages for vessels are available to meet the new power demand originating from reduced service speeds. We also convert oil-fuelled engines for gas or biofuel use.

Waste heat recovery for ships
In addition to waste heat recovery systems Wärtsilä has also introduced a Boosting Energy Efficiency catalogue, which contains more than 50 different efficiency improvement actions for saving energy in ships.

Environmentally advanced vessel solutions
The Wärtsilä Gas Platform Supply Vessel (PSV) design represents a state-of-the-art vessel featuring outstanding energy efficiency, a unique hull form, fuel flexibility and outstanding vessel performance in areas such as fuel economy and cargo capacity. This is a unique configuration of the gas electric propulsion system based on a combination of the Low Loss Concept for Electric Propulsion and the wide range of DF engines. Wärtsilä's ability to offer total concept solutions that include the design of the vessel, the propulsion plant, electric & automation and a host of fuel saving and environmentally sustainable options has given the company a notable competitive edge - particularly in the area of speciality vessels such as Gas PSVs.

Innovative design solutions for emission gas utilisation from very large crude carriers
Wärtsilä delivers innovative systems for the marine and oil and gas industry enabling emissions from the very large crude carriers (VLCC) to be completely put out saving the environment from emissions of greenhouse gases.

Wärtsilä has developed an integrated solution for emission utilisation which allows:

  • the recovery of gas emitted during crude oil loading and during voyage of the VLCC
  • The use of the recovered gas as fuel in gas engines and other consumers for power generation.

The Wärtsilä Voyage Emissions Reduction (VER) solutions reduce the loss of cargo of VLCC up to 5,400 tons per year and 80% of the recovered emissions can be turned into valuable fuel for the vessel. Furthermore the recovered emissions translates to approximately 20,000 tons CO2- equivalents. Local pollution is reduced by 80%.

Innovative design solutions to enable reductions of atmospheric emissions of volatile organic compounds from shuttle tankers
Wärtsilä delivers systems that eliminate the release of hydrocarbon vapours to the atmosphere by capturing the emissions during offshore oil loading to the shuttle tankers and floating storage unit (FSU) and utilizes it as a valuable light fuel for power generation.

This is accomplished by sending vent gas into the VOC recovery system, removing the heavier hydrocarbon fractions (mainly C3+) of the gas by a two stage condensation process before the non-condensable hydrocarbons (mainly methane & ethane) is fed immediately to power generating module; the liquefied VOC is instead stored in a tank and used later on as a light hydrocarbon fuel which can be applied as clean fuel in power generating modules and inert gas generator units. This means 100% VOC Recovery and zero VOC emission.

The Wärtsilä VOC recovery system has been successfully utilized on board of several shuttle tankers and floating storage units (FSU) in the North Sea.

Combined cycle 
Wärtsilä FlexicycleTM power plants integrate an engine power plant, heat recovery system and steam turbine to improve power plant efficiency and reduce emissions. Many Flexicycle power plants have been delivered during the recent years.

Combined heat and power
Combined heat and power plants (CHP) cover various types of recovery and utilisation of heat energy, in addition to electricity generation. The energy can be utilised as heat, such as hot water or steam, or as cooling by means of chillers. The most recent step is an exhaust gas driven chiller, which is believed to offer a cost-competitive CHP solution for various market areas.

Solution Power (MW) Fuel Annual CO2 reductions (t) Reference technology and fuel
Single cycle engine power plant 50 HFO 58 871 Boiler plant/Coal
Single cycle engine power plant 50 HFO 43 687 Gas turbine /LFO
Single cycle engine power plant 50 Gas 26 342 Single cycle gas turbine/Gas
CHP engine plant (total eff. 90%) 30 + 30 (Heat) Gas 83 552 Boiler plant/Coal (EI.) + Boiler plant/LFO (Heat)
DF engines in LNG carriers 40 Gas 41 000 Steam boiler
LNG cruise ship 68 Gas 43 000 Cruise ship/HFO
Gas engine conversion 50 Gas 57 200 Diesel engine/HFO

As the industry forerunner, Wärtsilä has a responsibility to develop and supply advanced solutions that enable the environmental impact of its customers to be reduced. This is Wärtsilä’s main role in the combat against climate change.

© 2018 Wärtsilä