Research On Cylinder Strain Analysis And Control Method Of High-pressure And Large-Capacity Type Ⅳ Hydrogen Storage Cylinder During Hydrogen Filling Process

As the status of hydrogen energy in the energy market continues to increase,highpressure and large-capacity type Ⅳ hydrogen storage cylinders are important containers for storing and transporting large amounts of hydrogen,and their efficiency and safety during use are becoming more and more important.The high-pressure and large-capacity type Ⅳhydrogen storage cylinder adopts a plastic liner and composite material fully wound gas cylinder structure.In the actual use process,due to the influence of the temperature rise of the hydrogen filling and the pressure difference between the inside and outside of the cylinder,hydrogen storage cylinder may have various cylinder deformation phenomena during the hydrogen filling process.A variety of cylinder deformation phenomena have a great impact on the safety of gas cylinders.This paper investigates the research status of the temperature rise effect of some type III and type Ⅳ hydrogen storage cylinders during the hydrogen filling process at home and abroad.Aiming at the problem of large temperature rise during the hydrogen filling process of the gas cylinders,it is proposed to formulate a suitable hydrogen filling process parameter by controlling the hydrogen filling process parameters.A strategy is used to improve the safety of high-pressure and large-capacity type Ⅳ hydrogen storage cylinders.The specific work is as follows:(1)The establishment of the model of hydrogen filling temperature rise and hydrogen filling deformation of high-pressure and large-capacity type Ⅳ hydrogen storage cylinder.Relying on the hydrogen storage cylinders involved in the project,after determining the length,diameter,multiple wall thicknesses and other dimensions of the simulated gas cylinders and the relevant parameters of the materials used in each part of the gas cylinders,in the Ansys simulation software,the flow-heat-solid A numerical simulation model of temperature rise and deformation during the hydrogen filling process of high-pressure and large-capacity Ⅳ hydrogen storage cylinders is constructed in a coupled way,which fully considers material properties,structural properties,boundary constraints,and multi-physics coupling.Through this simulation model,the temperature distribution in the hydrogen storage cylinder and the deformation of the cylinder body during the hydrogen filling process can be obtained.The existing literature data will be used to verify the correctness of the simulation results of the model.(2)To explore the effects of hydrogen filling process parameters such as hydrogen filling method,hydrogen filling rate,gas source temperature,and residual pressure in the cylinder on the hydrogen filling temperature rise and cylinder deformation of the hydrogen storage cylinder.The above-mentioned hydrogen charging simulation model will be used to explore the influence of the aforementioned hydrogen charging process parameters on the hydrogen filling temperature rise and cylinder deformation of the gas cylinder by means of the control variable method.The research results show that: During filling,staged filling can effectively improve the temperature rise inside the cylinder,but it is not effective in suppressing deformation;The higher the filling rate and gas source temperature,the higher the temperature rise inside the cylinder and the more severe deformation;The lower residual pressure inside cylinders leads to higher temperature rise inside cylinders and more severe deformation.(3)Based on the influence law of each hydrogen charging process parameter summarized in the previous step on the temperature rise and cylinder deformation of the hydrogen storage cylinder during the hydrogen filling process,the hydrogen filling process is optimized under the premise of comprehensively considering the safety and economy of the hydrogen filling process Parameters,formulate relevant hydrogen charging strategy references for some hydrogen charging scenarios,and provide technical support for the engineering application of such high-pressure and large-capacity type Ⅳ hydrogen storage cylinders.Taking this project’s cylinders as an example,linear filling can be used with a gas source temperature of 0°C to fill cylinders from 2MPa to 52 MPa within 1800 s.