Design And Performance Study Of Hydrogen Storage Cylinder Made Of Composite Materials

To achieve the two-carbon goal,it is crucial to explore new energy systems and promote energy transition.Carbon dioxide is produced mainly from the burning of fossil fuels.Hydrogen energy is considered one of the ideal alternatives to fossil energy because of its high efficiency and clean energy.In recent years,hydrogen energy has been widely used,and hydrogen fuel cell vehicles,hydrogen fuel cell ships,hydrogen fuel drones and other products have emerged.However,hydrogen is also dangerous and easy to explode after leakage,which brings challenges to hydrogen storage.As a carrier for hydrogen storage,hydrogen storage bottle must have high stability and durability.Plastic-lined composite all-wound hydrogen storage cylinder has a broad prospect because of its advantages such as light weight,corrosion resistance and good fatigue performance.However,compared with metal-lined gas cylinder,the rigidity of plastic lining is lower,which brings great difficulties to the design work.There are relatively few researches on plastic-lined gas cylinders in China,so this thesis carries out the following researches on plastic-lined composite all-wound hydrogen storage cylinders:(1)The structure design of the composite all-wound hydrogen storage bottle lining is carried out.Firstly,the structure form and geometric parameters of the head and seat are determined.Considering the low rigidity of the plastic lining,in order to ensure the smooth process of the subsequent fiber winding forming,the critical buckling load of the liner with different thickness was calculated by using the pressure vessel instability theory formula,eigenvalue method and nonlinear buckling analysis method respectively.At the same time,the optimal thickness of the liner was finally determined considering the quality design requirements of the liner.(2)The geodesic winding is adopted,and the spiral winding angle of the barrel section is determined according to the grid theory.The number of spiral winding layers is 7,and the number of circumferential winding layers is 18.According to the geodesic equation,the spiral winding angles at different parallel circle radii of the head are determined.Combining grid theory and cubic spline function,the winding thickness at different parallel circular radius positions of the head was predicted.(3)Based on the design parameters of the inner lining and winding layer,the ACP preprocessing module under the Hypermesh and Ansys Workbench platform was used to achieve variable angle and thickness winding of the head.A hydrogen storage bottle model was accurately established,and its stress-strain response under working pressure,test pressure and minimum burst pressure was studied.The results show that using grid theory to design the winding layer and using a single angle spiral winding on the cylinder body,the designed hydrogen storage bottle is in a safe state under both working pressure and test pressure.However,at the minimum blasting pressure,the hydrogen storage bottle will burst from the head,and the blasting position does not meet the design requirements.(4)Aiming at the problem of hydrogen storage bottles bursting from the head at the minimum bursting pressure,a head reinforcement plan is proposed from the perspective of process feasibility.After the head was reinforced six times,the maximum stress of the winding layer under the explosion pressure appeared in the circumferential layer of the cylinder body.The maximum stress criterion was used to predict that the hydrogen storage bottle after the head was reinforced will burst from the cylinder body under an internal pressure of 85.2MPa.(5)The inner lining is manufactured using injection molding technology,and a CNC winding machine is used to complete the fiber winding molding using carbon fiber T700 and EW-60 D epoxy resin.The solidified hydrogen storage bottle is subjected to hydraulic explosion testing.The explosion pressure of the hydrogen storage bottle after the head reinforcement test is 80 MPa,and the explosion position is the cylinder body.The predicted blasting position by simulation is consistent with the experimental results,and the error between the simulated predicted burst pressure and the experimental results is only 6.5%,which verifies the correctness of the designed hydrogen storage bottle parameters and simulation analysis.In this thesis,theoretical design,finite element simulation and experimental verification are combined to make an in-depth analysis on the design and performance of plastic lined composite wrapped hydrogen storage bottle,which has guiding significance for the research and development of type IV hydrogen storage bottle.