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Rail Transit Exhibition News The Korea Railroad Technology Research Institute (hereinafter referred to as the "Korea Railroad Research Institute") has successfully developed an on-board liquid hydrogen supply system, a core technology for the "on-board liquid hydrogen (liquefied hydrogen) supply system" for rail vehicles. The system adopts a "compact control device" that integrates pressure, flow and temperature control, which achieves the advantages of reducing the size by 10% and weight by 5% compared to the old modular design, greatly improving the efficiency of the system.
Prototype of a small lightweight liquid hydrogen supply system
According to reports, the system can more than double the cruising range after a single refueling compared with traditional hydrogen fuel trains, thereby significantly improving operational efficiency.
Extreme low-temperature storage: Liquid hydrogen is liquid hydrogen formed by cooling gaseous hydrogen to –253 °C, which has the characteristics of small size and easy storage and transportation, but has extremely high requirements for temperature control and pressure stability of the supply system.
Compact control system: Previously, each function was designed as an independent module, which was difficult to install on the train due to its large size. This time, the integrated control unit integrates multiple functions and significantly reduces the size and weight.
Considerable power output: Designed to support four 95 kW fuel cells (up to 380 kW total) to drive rail vehicles stably.
Kevlar Support Structure: Kevlar material is used as the support frame for hydrogen storage vessels, which is five times more durable than steel and is lightweight and heat-resistant, effectively enhancing thermal insulation performance in extremely low temperature environments.
Dual heat source vaporization method: The system combines electric heating and external atmospheric heat energy as the vaporization heat source to improve the vaporization efficiency and energy consumption performance.
Self-pressure supply innovation: The Pressure Build-Up (PBU) system is used to generate pressure during the vaporization process, and the fuel cell is driven through the pipeline backflow to maintain a pressure of about 17 bar, eliminating the need for liquid hydrogen pumps and compressors, simplifying the system and improving stability.
This R&D project is part of the basic project "Development of Compact and Lightweight Technology for On-board Liquid Hydrogen Supply System" under the National Science and Technology Research Council (NST) of Korea, and is jointly implemented by the Korea Railroad Research Institute and Parity Co., Ltd., a partner company. At present, the system has entered the certification and testing stage, and has the ability to be applied immediately on trains, which plays an important role in accelerating the conversion of old diesel locomotives to liquid hydrogen power.
3D drawing of a compact and lightweight liquid hydrogen supply system designed
Jin Jidong, head of the development team and senior researcher at the Railway Research Institute, said that the plan is to fully verify the performance of the system through multiple tests by 2026, and apply this propulsion system to existing hydrogen trams (hydrogen-powered trams) to carry out liquid hydrogen empirical research. President Sha Gongming also emphasized: "The Railway Research Institute will continue to lead the research and development of sustainable railway environmental technology, verify the feasibility of hydrogen-based urban transportation, and lay a solid technical foundation for the era of new energy transformation." ”
