LNG a Key to cleaner shipping
Global shipping can reduce its CO2 emissions by 30 % the next 20 years through measures that are profitable for the shipping companies. The single most effective move is to introduce LNG as fuel, said Executive Vice President Remi Eriksen of DNV at a shipping summit in Shanghai DNV has carried out a study of 59 ship segments representing the major shiptypes and sizes of international shipping, identifying 25 different measures that can contribute to reduced emissions. Each of these segments have been modelled separately with regard to operational assumptions, the reduction potential of each measure, the cost of each measure and the year when available measures are phased in.
For 17 of the 59 vessel types and sizes it is cost-effective to install gas-fuelled engines assuming a gas price equal to the price of marine diesel oil. The study, called Pathway to Low Carbon Shipping demonstrates that CO2 emissions by 2030 can be reduced by 30% below baseline through measures that save cost for the operators, and by almost 60% if all the identified measures are included.
Many believe that gas is tomorrows fuel. We at DNV think it is already here. LNG as a fuel offers obvious environmental benefits, said Remi Eriksen. These benefits include nearly 100% reduction in SOX and particle emissions, 85-90% reduction in NOX emissions and 15-20% reduction in CO2 emissions.
Abundance of LNG
For a switch to LNG to happen certain elements need to be in place, Remi Eriksen pointed out. The technology is there, as many manufactures are offering LNG fuelled engines already. A challenge is the loss of cargo space due to cylindrical LNG storage tank. For newbuildings it is fairly simple to find space for the larger fuel tanks, while this may be more difficult for retrofitting on existing ship.
There is an abundance of natural gas in the world. When we add unconventional resources like e.g. shale gas there is a 250-year supply at current usage. The spot price of LNG is already at one fourth to one third the price of diesel oil. LNG needs to be offered with a price linked to the spot market price rather than the prices of the marine diesel that it may replace.
The main challenge is the lack of LNG bunkering infrastructure. As an example, distribution of LNG as fuel for ships in Norway is done through dedicated terminals for ships in point-to-point traffic (ferries) or for ships always returning to the same port (supply vessels). Larger scale development should be based on making LNG available at existing bunkering stations. When it comes to sourcing of LNG this must be based on economic considerations Remi Eriksen said.
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Source:DNV
