The helium turbine expander,a pivotal component within a hydrogen liquefaction system,is crucial for effective cooling.Through the use of a multistage series-connected turbine expander,the system is able to accommodat...The helium turbine expander,a pivotal component within a hydrogen liquefaction system,is crucial for effective cooling.Through the use of a multistage series-connected turbine expander,the system is able to accommodate more complex operating conditions and provide enhanced refrigeration efficiency by a gradual and controlled reduction in temperature,thereby optimizing overall performance.In this study,the interstage characteristics of a two-stage series-connected helium turbine expander in a hydrogen liquefaction system employing the inverse Brayton cycle are analyzed in depth.After validation of the reliability of the numerical simulation results using a rigorous on-site joint test system incorporating the helium turbine expander,the operational performance of each expander stage and that of the second-stage expander under various operating conditions are obtained.In addition,the energy loss distributions within various through-flow components and the primary loss zones within the impeller are comprehensively analyzed on the basis of entropy production theory.The findings presented in this paper represent a significant contribution in providing a foundational reference for the development of multistage series-connected cryogenic gas turbine expanders.展开更多
基金supported by the Zhejiang Provincial Key Research and Development Project No.2023C03158.
文摘The helium turbine expander,a pivotal component within a hydrogen liquefaction system,is crucial for effective cooling.Through the use of a multistage series-connected turbine expander,the system is able to accommodate more complex operating conditions and provide enhanced refrigeration efficiency by a gradual and controlled reduction in temperature,thereby optimizing overall performance.In this study,the interstage characteristics of a two-stage series-connected helium turbine expander in a hydrogen liquefaction system employing the inverse Brayton cycle are analyzed in depth.After validation of the reliability of the numerical simulation results using a rigorous on-site joint test system incorporating the helium turbine expander,the operational performance of each expander stage and that of the second-stage expander under various operating conditions are obtained.In addition,the energy loss distributions within various through-flow components and the primary loss zones within the impeller are comprehensively analyzed on the basis of entropy production theory.The findings presented in this paper represent a significant contribution in providing a foundational reference for the development of multistage series-connected cryogenic gas turbine expanders.
