In the maritime realm, the utilization of liquefied natural gas (LNG) as a fuel source has been instrumental, yet it poses a challenge known as “methane slip” for engine manufacturers like Wärtsilä.
Methane slip arises when a portion of LNG fuel fails to combust in vessel engines, resulting in its release into the atmosphere. Grasping the implications, causes, and available solutions for this phenomenon is pivotal for the maritime industry’s environmental commitment, says an article published on wartsila website.
Understanding Methane Slip
LNG primarily consists of methane. Although a major part of the methane in the fuel is converted into energy during engine operation, a residue remains unburned, leading to methane slip.
Unaddressed emissions from LNG production and transportation undermine the environmental benefits of using LNG. Methane is a potent greenhouse gas, with a shorter atmospheric lifespan than carbon dioxide, necessitating its reduction to combat climate change effectively.
Regulatory Measures And Industry Responses
Current international maritime regulations lack explicit provisions concerning methane emissions, but forthcoming measures scheduled for 2025 will focus on addressing methane slip. Initiatives like the EU Emission Trading System and FuelEU Maritime aim to regulate greenhouse gas emissions, including methane.
The Marine Environment Protection Committee (MEPC80) emphasizes incorporating methane emissions into future IMO regulations, showcasing the industry’s commitment to reducing emissions.
Identifying Causes And Reducing Methane Slip
Methane slip in LNG engines stems from various sources, such as flame quenching in crevices and scavenging losses. To mitigate these emissions, two primary methods are suggested: engine upgrades and reduction in fuel consumption.
Manufacturers like Wärtsilä offer software upgrades for dual-fuel engines, facilitating significant reductions in methane slip without extensive engineering modifications.
Future-Proofing Vessels And Technological Advancements
Designing vessels to accommodate future changes is essential. Dual-fuel engines offer adaptability to varying circumstances and highlight the industry’s progress in mitigating methane slip. Manufacturers have made substantial advancements in reducing methane slip, exemplified by the latest Wärtsilä 31 DF engine, featuring significantly lowered methane slip and NOx emissions.
The ongoing efforts to curb methane slip in LNG-powered vessels underscore the maritime industry’s commitment to environmental sustainability. Embracing regulatory changes and technological advancements, the industry aims to effectively diminish greenhouse gas emissions while advancing toward a more sustainable future.
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Source: wartsila
