Development Status and Key Technologies of Liquid Hydrogen Piston Pump

With the release of national standards related to liquid hydrogen for civil use in China's hydrogen energy industry,the liquid hydrogen industry chain of domestic hydrogen liquefaction,storage,transportation and refueling has entered a period of rapid development.In the process of storage,transportation and filling of liquid hydrogen,liquid hydrogen pump is the key equipment to improve energy efficiency,reduce cost and be suitable for the marketization and largescale application of liquid hydrogen industry.The advantages of liquid hydrogen pump in the industrial development of liquid hydrogen are summarized,and the development status of liquid hydrogen pump is introduced.The structure of liquid hydrogen piston pump is studied.Four key parameters including mass flow rate,output pressure,pump volume efficiency and liquid hydrogen evaporation loss are given to evaluate the performance of liquid hydrogen pump.In view of the key factors affecting the key parameters,the key technologies,such as suppression of cooling capacity loss,mechanical wear reduction and suppression of volume leakage loss technology,are further analyzed and discussed,which provides pros-pects for improving the performance of liquid hydrogen pump.