地下储氢罐套管密封结构强度分析及优化设计

Strength Analysis and Optimization Design of Casing Sealing Structure of Underground Hydrogen Storage Tank

以某加氢站储氢罐套管端口的连接部分为研究对象,采用有限元分析方法,对该储氢罐在45 MPa气体压力下的密封面进行强度分析,从而得到储氢罐接箍在不同工况下密封面的应力分布规律。同时,通过对比分析不同工况下的密封面应力极值,确定套管预紧力的极限值。基于ANSYS软件中响应面优化模块,以密封面接触压力大于462.14 MPa,且应力值最小为优化目标,最后提出套管端口密封面尺寸优化方案。结果表明,套管预紧力极限值为2.8875×10^(6) N;优化后密封面接触压力基本保持不变,最大应力值减少了10%,既保证了密封效能,又减小了应力值;最佳台肩角度、密封弧面到锥螺纹距离、弧面半径分别为56.32°、13.037 mm和18.77 mm。本研究对储氢罐套管与接箍密封面的结构尺寸优化有借鉴意义。

This study focuses on the connection part of the casing of the hydrogen storage tank at a hydrogen refueling station.Using the finite element analysis method,the strength of the sealing surface of the storage tank under 45 MPa gas pressure is analyzed,and the stress distribution pattern of the sealing surface of the storage tank under different working conditions is obtained.At the same time,by comparing the stress extreme values of the sealing surface under different working conditions,the limit value of the casing pre-tightening force is determined.Based on the response surface optimization module in the ANSYS software,with the sealing surface contact pressure greater than 462.14 MPa and the minimum stress intensity as the optimization target,a sealing surface size optimization scheme for the casing port is proposed.The results show that the limit value of the casing pre-tightening force is 2.8875×10^(6) N.In addition,after optimization,the sealing surface contact pressure remains basically unchanged,and the maximum stress value is reduced by 10%.This not only ensures the sealing effectiveness but also reduces the stress value.The optimal shoulder angle,the distance between the sealing arc surface and the tapered thread,and the arc surface radius are determined to be 56.32°,13.037 mm and 18.77 mm,respectively.The structural size optimization of the sealing surface between the hydrogen storage tank casing and the interface has reference significance.