Hydrogen liquefaction plants are crucial for promoting the large-scale application of hydrogen.The technical features and development progress of the first 5 t/d hydrogen liquefaction unit in China are introduced.The hydrogen lique-faction unit directly uses hydrogen as a refrigerant,employing a dual-pressure Claude cycle with LN2 precooling to liquefy hydrogen.The ortho-para hydrogen conversion process is facilitated through a combination of isothermal conversion at 80 K using nitrogen as the cooling medium,and continuous ortho-para conversion at temperatures below 80 K.It provides the ad-vantages of high hydrogen liquefaction cycle efficiency,low energy consumption,and high ortho-para conversion efficiency.The main equipment includes two sets of cascade reciprocating oil-free hydrogen compressor units,a vacuum insulated cold box with a diameter of 3.2 meters and a length of 11 meters,and a liquid hydrogen storage tank.The main equipment in the vacuum insulated cold box includes four hydrogen turbine expanders,multi-stage low-temperature heat exchangers,multi-stage ortho-para hydrogen converters,and low-temperature control valves.Through the process optimization design,the hy-drogen liquefaction capacity is 5 t/d,and the designed specific energy consumption is 11 kW·h/kg.At present,the hydrogen compressors and hydrogen liquefaction cold box have been manufactured.The system commissioning and operation will be carried out soon.
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