Frederike Engels, M.Sc., eCap Marine GmbH, Hamburg
In February 2024, a significant milestone was reached with the finalization of the commissioning of a 400kW fuel cell (FC) power system onboard the Offshore Supply Vessel (OSV) named “Coastal Liberty”. This vessel operates within the environmentally sensitive nature reserve zone known as the Wadden Sea in the North Sea, and its primary objective is to deliver emission-free power within this pristine area. The FC power system installed on the Coastal Liberty is contained within a 20-ft.-unit, which houses not only the fuel cells themselves but also batteries, inverters, power management components, and all necessary safety features. Additionally, a 10-ft.-unit serves as the hydrogen tank, while the hydrogen valve system itself is integrated into the FC power container. Notably, the FC power container has received class approval from DNV and is witnessed by the Dutch flag using an Alternative Design Approach. One of the most formidable challenges encountered during the implementation of this project was navigating the intricate web of rules and regulations. Interestingly, at the time of the project's inception, there were no specific regulations governing hydrogen-powered vessels. Nonetheless, the project adhered closely to established guidelines such as the IGF code and Interim Guidelines provided by both the International Maritime Organization (IMO) and DNV. This necessitated a delicate balance between technical feasibility and compliance with evolving regulatory frameworks, often presenting hurdles in the integration process. From the perspective of naval architects, assimilating the FC power system into the existing design of the vessel posed significant challenges. This included considerations such as ensuring compliance with ex-zone regulations and seamlessly integrating the container into the ship's structure. Structural modifications were necessary, such as replacing existing engine room air intakes and constructing foundations within the ship's framework to support the FC power container. The culmination of this project marks not only a technological achievement but also a pioneering step towards sustainable maritime practices. The Coastal Liberty stands as the very first German DNV approved hydrogen-powered vessel, setting a precedent for future innovations in maritime propulsion. In addition to overcoming technical challenges, the project yielded invaluable insights and lessons learned. These experiences serve to inform future endeavours in hydrogen-powered maritime transportation, providing a foundation for continued innovation and advancement in this promising field. Furthermore, this presentation aims to shed light on the operational aspects of the FC power system and the overarching safety philosophy guiding its implementation. By sharing our experiences, we hope to contribute to the broader dialogue surrounding sustainable marine technologies and inspire further collaboration and development in this critical area. In conclusion, the successful commissioning of the 400kW fuel cell power system onboard the Coastal Liberty represents a significant milestone in the quest for alternative fuels in the shipping industry. Despite the challenges encountered along the way, the project stands as a testament to the ingenuity and determination of all involved parties. Moving forward, we remain committed to pushing the boundaries of innovation and sustainability in the maritime industry and already have a bigger project in the pipeline, to show a short glance into the design of a newbuilt hydrogen powered container vessel.