Core Viewpoint - The hydrogen energy industry, particularly in the storage and transportation segment, is crucial for connecting production and application, with liquid hydrogen storage gaining significant attention due to its technical advantages [3][4]. Summary by Sections Advantages of Liquid Hydrogen Storage - High transportation efficiency with low sensitivity to distance in transportation costs - Wide application scenarios, catering to high-end fields like semiconductors and aerospace, as well as long-distance transport for heavy trucks and ships - Potential for large-scale application, showcasing large storage capacity, fast filling speed, and small footprint when utilized on a large scale [3]. Challenges in Industrialization - Technical challenges include insufficient domestic production rates of core equipment, such as the need for improved adiabatic efficiency in turbine expanders and the current status of vehicle-mounted liquid hydrogen tanks being in the engineering prototype stage - High investment costs for liquid hydrogen plants, with electricity costs accounting for about 70% of total liquefaction costs, limiting expansion into the civilian market - Incomplete standard systems, with existing national standards for liquid hydrogen but lacking comprehensive testing bases and certification systems [4]. Recent Developments in Liquid Hydrogen Sector 1. **Panzhihua Liquid Hydrogen Demonstration Project**: The main equipment for this project, led by the Aerospace Science and Technology Group, has been successfully transported, marking a new era for liquid hydrogen's full industrial chain demonstration in the Sichuan-Chongqing region [4]. 2. **Jiuquan Steel's Special Steel for Liquid Hydrogen Storage**: The S31603 (JLH) austenitic stainless steel plate has passed technical evaluations, suitable for extreme low-temperature environments [5]. 3. **CNOOC Engineering's Low-Temperature Liquid Hydrogen Tank**: This tank has received AIP certification, featuring advanced insulation structures and achieving industry-leading evaporation rates [6]. 4. **20m³ Liquid Hydrogen Tank by Aerospace Six Academy**: Successfully developed with advanced vacuum insulation technology, ensuring safety and efficiency [7]. 5. **Jiangsu Heng Hydrogen's Large-Scale Liquid Hydrogen Storage Project**: This project, with a total investment of 500 million yuan, aims to produce 100 sets of large-scale liquid hydrogen storage and transportation equipment annually [8]. 6. **First Domestic Liquid Hydrogen Production and Storage Demonstration Project**: This project aims to establish a comprehensive solution for liquid hydrogen, enhancing commercialization efforts [9][12]. 7. **Liquid Hydrogen Technology Alliance Formation**: This alliance aims to develop technical specifications and address key challenges in liquid hydrogen technology [13][14]. 8. **Successful Test Flight of a Ton-Class Liquid Hydrogen Drone**: This marks a significant breakthrough in liquid hydrogen applications, validating the feasibility of the liquid hydrogen supply system [15].

Core Viewpoint - The article highlights the successful development and approval of a large-capacity liquid hydrogen storage tank for deep-sea floating platforms by CNOOC Engineering, marking a significant advancement in offshore energy technology [1] Group 1: Product Development - CNOOC Engineering's special equipment division has received the Approval in Principle (AIP) certificate from China Classification Society (CCS) for its self-developed low-temperature liquid hydrogen storage tank [1] - This is the first large-capacity liquid hydrogen storage tank designed specifically for deep-sea floating platforms in China [1] Group 2: Technical Challenges and Solutions - The storage tank must ensure absolute safety under extreme conditions, including risks from ultra-low temperatures of -253°C, 12-level sea winds, high salt corrosion, and potential fatigue damage from liquid hydrogen movement [1] - The project team overcame multiple technical challenges by employing a multi-layer vacuum insulation structure and achieving an industry-leading evaporation rate of ≤0.5% [1] - The design includes a unique cross-wave barrier to effectively suppress liquid hydrogen movement, significantly reducing the risk of pressure surges under extreme conditions [1] Group 3: Future Plans - CNOOC Engineering plans to continue enhancing its technological capabilities and expand its "Qinghai" series products to support the development and comprehensive utilization of new offshore energy [1]