The recently launched GREEN RAY project will develop three solutions to reduce methane slip from LNG in new and existing ships.
GREEN RAY technologies will reduce the methane slip from LNG vessels contributing directly to reduction of the total greenhouse gas emissions.
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To ensure the sustainability of the gains in human and environmental health from the shift to LNG, the GREEN RAY consortium aims to tackle methane slip at all engine loads, thus reducing shipping-based GHG emissions and increasing fuel-efficiency.
The project is focused on the LNG engine technology based on a low-pressure dual-fuel concept. To prevent methane slip the GREEN RAY consortium will develop two on-engine technologies and one after-treatment technology for existing vessels and new ships:
- Four-stroke engine: this engine will aim to enable methane slip reduction at all engine loads and to be applicable to the largest engines in the market involving cruise, ferry and gas carriers.
- Two-stroke engine: around a patented LNG injection system, this engine will aim to significantly reduce methane slip.
- Sulphur resistant catalyst system: this system will significantly reduce methane slip emissions – up to 95% – and reduce the methane slip to less than 1g/kWh.
The developed technologies will be demonstrated onboard two new ships and one retrofit to existing vessels, all of them targeting the Technology Readiness Level (TRL) 7: System prototype demonstration in operational environment.
The consortium will also contribute to climate data collection via the study methane levels to, which will allow for a more global assessment of GHG emissions from LNG marine fuel. The data collected will be combined with onboard experiments and modelling to provide a more comprehensive outlook of the climate impacts of marine transport.
