Research status and key technical issues of high pressure liquid hydrogen pump industry
Liquefying hydrogen,and store,transport and refuel it in the form of liquid hydrogen is one of the important methods to reduce the total hydrogen cost,which is expected to be a better choice in the face of greater hydrogen demand in the future.As the key equipment in the liquid hydrogen industry chain,the localization level of high pressure liquid hydrogen pump is very important to reduce the cost and improve the independence and controllability of the industry chain.In this paper,the application status of high pressure liquid hydrogen pump at hydrogen refueling stations and its domestic and foreign research and development situations are investigated systematically,the urgent key technical issues in the research of high pressure liquid hydrogen pump are analyzed,and the technical research directions and main paths of the localization of liquid hydrogen pump are put forward.The following results are obtained.First,there are mainly three technical modes at liquid hydrogen refueling stations,including low pressure vaporization compression,liquid hydrogen pump boosting vaporization and direct refueling,among which,liquid hydrogen pump boosting vaporization is the mainstream technical mode at the hydrogen refueling station of liquid hydrogen storage type.Second,in China,there are fewer public research achievements on the research and development of high pressure liquid hydrogen pump,the localization of high pressure liquid hydrogen pump is still in the initial stage of research and development,and the stability and maturity of the product need verifying.Third,the urgent key technical issues in the research and development of the localization of high pressure liquid hydrogen pump include structure form selection and design,low temperature insulation performance,material selection,piston sealing and leakage control,and the suggestions for the localization of liquid hydrogen pump are proposed specifically.In conclusion,in the design of high pressure liquid hydrogen pump,it is necessary to balance between technology and performance and between production and maintenance,in order to ensure its stable and reliable operation at extremely low temperature.What's more,with the rapid development of hydrogen energy industry,the cross-border transportation of hydrogen energy will become true,when liquid hydrogen will become the important storage and transportation mode,and high pressure liquid hydrogen pump will play an important role in the links of international liquid hydrogen logistical like shipping vessel receiving,tank conversion into injection,liquid hydrogen tanker charging,and liquid hydrogen refueling.
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