DTU Advances Maritime Hydrogen Safety with Novel Assessment Method and Simulation-Based LH2 Tank Design

DTU Research Database Denmark

Overview

The Technical University of Denmark (DTU) has developed a novel methodology for the comparative safety assessment of hydrogen in maritime applications, aiming to accelerate its safe and widespread adoption in the shipping industry. To address hydrogen’s inherent flammability and explosive potential, the research also proposes a simulation-based design approach for liquid hydrogen fuel tanks, ensuring robust structural integrity and operational safety in dynamic maritime environments.

In Depth

Background

The International Maritime Organization (IMO) has set ambitious goals to significantly reduce greenhouse gas emissions by 2050, compelling the shipping industry to aggressively pursue alternative fuels for decarbonization. As a strong candidate for a zero-emission fuel, hydrogen’s safe utilization in the unique and demanding maritime environment necessitates stringent standards and the development of innovative safety technologies. DTU’s research offers a crucial contribution to addressing this global challenge, providing essential tools for the industry’s transition.

Key Findings & Technical Details

Research conducted at the Technical University of Denmark (DTU) has yielded a novel methodology for comprehensively comparing and evaluating the safety of hydrogen utilization in maritime applications. This innovative approach is poised to pave the way for the broader and safer adoption of hydrogen in the shipping industry, specifically addressing its inherent hazards while also proposing a simulation-based approach for the design and specification of liquid hydrogen fuel tanks.

• New Hydrogen Safety Assessment Method: This advanced assessment methodology transcends traditional safety analysis techniques, enabling a more detailed and quantitative evaluation of potential risks associated with hydrogen fuel systems. It is designed to encompass accident scenario analysis, integrate risk-based design principles, and evaluate the effectiveness of proposed safety enhancement measures, providing a robust framework for maritime safety.
• Hydrogen Hazard Characteristics:
  • Non-toxic: Hydrogen is non-toxic, offering a significant advantage over many conventional fossil fuels in terms of health and environmental impact from potential exposure.
  • High Flammability and Explosivity: Despite being non-toxic, hydrogen is highly flammable. Its broad flammability range in air, specifically between 18.3% and 59% volume concentration, presents a significant explosion hazard. This wide range mandates stringent containment and advanced leak detection systems on vessels.
  • Low Density: Hydrogen is considerably lighter than air, meaning it tends to rise and disperse rapidly if leaked. While this characteristic can prevent pooling in open spaces, it can also lead to hazardous accumulation in confined overhead spaces, increasing explosion risks if not properly managed with active ventilation.
• Liquid Hydrogen Fuel Tank Design: Liquid hydrogen (LH2) requires storage at extremely cryogenic temperatures (-253°C or -423°F), demanding specialized materials and advanced insulation structures. The research proposes a sophisticated simulation-based approach that rigorously considers dynamic design loads prevalent in maritime operational environments (e.g., vessel motion, potential collisions). This approach is critical to ensuring the structural integrity and long-term safety of LH2 tanks, particularly vital for extended voyages.

Strategic Significance & Outlook

The new safety assessment methodology and the simulation-based design approach for liquid hydrogen fuel tanks developed by DTU establish a reliable foundation for promoting the adoption of hydrogen fuel in maritime transport. These research outcomes will serve as vital tools for regulatory bodies, shipowners, shipbuilders, and technology developers, ensuring safety throughout the design, construction, and operation of hydrogen-fueled vessels. This advancement is expected to accelerate the decarbonization of the maritime industry, leading to a safer and more efficient transition towards a sustainable future for global shipping, benefiting both environmental stewardship and economic resilience.

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