The 33rd China International Exhibition on Electric Power Equipment and Technology
Shanghai International Energy Storage Technology Application Expo / Hydrogen Energy Expo
Liquid hydrogen (LH?) is produced by cooling gaseous hydrogen to –253°C (20 K), at which point it liquefies and achieves a volumetric density approximately 800 times greater than ambient-pressure gas. This high energy density makes liquid hydrogen attractive for large-volume storage and long-distance transport where the weight and volume of compressed gas cylinders become prohibitive. Liquid hydrogen is stored in vacuum-insulated cryogenic tanks (dewars) and transported by cryogenic tanker trucks, rail cars, or ships. The main challenges are the energy cost of liquefaction (approximately 30% of the hydrogen's energy content), boil-off losses during storage and transport, and the complexity of cryogenic handling equipment. Liquid hydrogen is currently used primarily in aerospace and industrial applications, with growing interest for heavy-duty transport and large-scale hydrogen import/export.
5 Key Questions About Liquid Hydrogen Storage and Transport
Liquid hydrogen offers approximately 4–5 times higher volumetric energy density than 700-bar compressed gas, enabling more hydrogen to be transported per vehicle trip and stored in a given tank volume. This makes liquid hydrogen more economical for large-volume applications such as industrial supply, heavy-duty vehicle refuelling, and long-distance maritime transport. Liquid hydrogen also eliminates the need for high-pressure compression equipment at the point of use, simplifying dispensing infrastructure for large consumers.
Boil-off refers to the evaporation of liquid hydrogen due to heat ingress through the insulation of cryogenic storage vessels, even with the best available vacuum insulation. Boil-off rates for modern cryogenic tanks are typically 0.1–0.3% per day for large stationary tanks and 0.3–1% per day for vehicle tanks. Boil-off gas can be recaptured and re-liquefied, vented safely, or used as fuel. Managing boil-off is critical for economic viability — for long storage periods or small tank sizes, boil-off losses can significantly increase the effective cost of liquid hydrogen.
Liquid hydrogen maritime transport requires specially designed cryogenic tankers similar to LNG carriers but with more stringent insulation requirements due to hydrogen's lower boiling point. The world's first liquid hydrogen carrier, the Suiso Frontier, was developed by Japan's Kawasaki Heavy Industries and completed a demonstration voyage from Australia to Japan in 2022. Commercial-scale liquid hydrogen shipping is expected to develop in the late 2020s, enabling long-distance hydrogen trade between regions with abundant renewable energy (Australia, Middle East, Chile) and hydrogen-importing nations (Japan, South Korea, Europe).
Liquefying hydrogen requires approximately 10–15 kWh of electricity per kilogram of liquid hydrogen produced — representing 30–45% of the hydrogen's energy content (33 kWh/kg LHV). This significant energy penalty is the main economic disadvantage of liquid hydrogen compared to compressed gas for shorter-distance applications. Large-scale liquefaction plants achieve better efficiency than small-scale units due to thermodynamic advantages of scale. Advances in liquefaction technology, including magnetic refrigeration and improved heat exchanger designs, are targeting reductions in liquefaction energy consumption.
Liquid hydrogen handling requires specialised training and equipment due to its cryogenic temperature (–253°C), flammability (4–75% in air), and the risk of oxygen condensation on uninsulated surfaces. Key safety measures include vacuum-insulated transfer lines and storage vessels, hydrogen leak detection systems, pressure relief devices, and inerting procedures to prevent air ingress. Personnel must use cryogenic protective equipment. International standards including ISO 13985 (liquid hydrogen vehicle fuel systems) and NFPA 2 (Hydrogen Technologies Code) provide safety frameworks for liquid hydrogen facilities.
Key Takeaways
SF6-free switchgear eliminates the use of sulphur hexafluoride, the most potent greenhouse gas in industrial use, while maintaining the safety and reliability essential for power system protection. As utilities face mounting pressure to reduce emissions, SF6-free alternatives are gaining rapid market acceptance. EP Shanghai provides a platform for manufacturers to showcase their latest environmentally friendly switchgear solutions to China's power sector buyers.
Firefox
Chrome
Safari
QQ
Edge