August 16th, 2018 by Paul
Nominated to the Innovation Award: Liegruppen and Salt Ship Design AS
Liegruppen Fiskeri AS at Straume and Salt Ship Design AS at Stord have been nominated for this year’s Innovation Award for the development of a new high-tech, cost-effective and environmentally friendly fishing vessel.
The ship will replace the Lie group’s vessel “Libas”, which was sold to Iceland late in 2016, and the new ship also takes over the name of its predecessor. The new “Libas” will be delivered in the first quarter of 2020.
The company says that the vessel will be the first fishing vessel with a main engine operating 95% on cooled natural gas.
– The experience from this project may be of major importance for the development of more environmentally friendly fishing vessels nationally and internationally in the future, the initiators said.
When natural gas is cooled to -162 degrees, it passes from a gas phase to a liquid phase, also known as Liquified Natural Gas (LNG). The cooling means that the volume of the gas is reduced to about 1/600 of the volume it has in the gas phase. This means that the gas is both energy efficient and easy to transport. Liquid gas is not toxic and cannot burn.
– The main engine of the new “Libas” is dimensioned for the power requirements for propulsion and for electrical power requirements during normal operation. The one auxiliary engine can also switch between LNG and diesel, and this complements the main engine during some work tasks and in bad weather.
Salt Ship Design explains that the effect of the innovative systems on board is intended to reduce total fuel consumption by about fifteen percent. In addition, NOx emissions will be reduced by around 80% and CO2 emissions by 24%.
The cooperation between Liegruppen and Salt Ship Design has resulted in a ship that will have both diesel and fuel systems for natural gas. According to Liegruppen, this will enable “Libas” to make longer trips in areas where there is no possibility of LNG bunkering. The gas storage tank is dimensioned so that a total of 95% of the consumption, based on today’s operating pattern, will be covered by natural gas.
The main engine, which is diesel powered, is replaced by a dual-fuel main engine with equivalent engine power in new “Libas”. According to the developers, this is designed to cover both the need for propulsion and electric power during normal operation of the ship.
As the media have often pointed out lately, land-based electricity supply is not always an option. Here, diesel engines will be replaced by a dual-fuel engine, which can use natural gas as the primary fuel also when the fishing vessel is in port.
Hybrid battery system
Developers say that a hybrid battery system will also be installed with battery packs on board.
The energy content of the battery pack will be 500 kWh. The battery is designed for the ship’s typical operating profile, and is equipped with infrastructure that provides short response time and adequate leveling of short-term load variations, called “peak shaving”.
– These factors specifically reduce fuel consumption through more stable and optimal operation of the main engine.
The innovators behind the new ship explain that an essential feature of the combination of natural gas and hybrid battery is that a dual-fuel engine has a longer response time than a diesel engine. This can be a challenge during fishing and maneuvering, when fast load control is needed.
Response time is a disadvantage that has previously been visualized in studies of natural gas operation of fishing vessels. The hybrid battery solution enables “boosting” via an electric motor (PTI), which will get power out of the battery and thus eliminates the problem.
The battery pack in combination with the LNG boiler also provides the ability to remain at the dock for up to ten hours – without the engines running or using land-based electricity.
When the ship is in port on land-based electricity, one can avoid engine operation, since the battery pack will support any energy requirements such as crane operation or the like.
“Libas” will be equipped with electric winches and fish pumps to reduce energy consumption. The surplus energy from the winches will be used as energy consumption on board or to charge the batteries.
«Wave power plant»
Turbines in the tanks that counteract the ship’s movements will generate energy stored in batteries.
– In the stabilization tank / roll-reduction tank, two turbines are installed, which generate current from the waves created in the tank. This power is recorded in the ship’s system and can be used directly or to recharge the battery bank, Liegruppen writes in a statement about the new vessel.
– In theory, this, in combination with the LNG boiler, can be sufficient when the ship is “drifting idly” on the fishing ground.
Gas-powered boiler and heat recovery system
A gas-powered boiler will be used while the ship is docked. The fact that the boiler is powered by natural gas results in lower fuel consumption and lower NOx emissions.
The Innovation Award- nominated companies declare that this measure reduces the amount of energy used to heat the systems on board the boat.
– The heat recovery system in itself is no longer groundbreaking. What is new is that it is combined with LNG boiler. The control system that optimizes energy consumption, uses the energy where it is needed and extracts energy from where it is available, which in turn contributes to reducing the total amount of energy and emissions.
The actual design for “Libas” is unconventional, where the superstructure has been moved forward with a covered deck and screen boxes.
– This is not only done to make the ship appear properly design-wise, but also for optimal weight distribution and to reduce sea movements.
You can find Salt Ship design on stand D-334 under Nor-Fishing 2018.