Ⅲ型车载高压储氢瓶火灾环境爆破试验关键参数研究OA

In response to the significant risks associated with hydrogen storage cylinders under extreme fire conditions,this study adopts a method combining fire accident analysis with fire test data to systematically evaluate key parameters such as the burst pressure of hydrogen storage tanks.The results show that the pressure-bearing capacity of hydrogen storage tanks decreases significantly under fire exposure:For a tank with a nominal working pressure(NWP)of 35 MPa,the burst pressure drops from 122.7～126.0 MPa at room temperature to 41.1～53.5 MPa;For a 70 MPa NWP tank,it drops from 209.8～226.8 MPa at room temperature to 98.9～112.3 MPa.The time from fire exposure to tank explosion ranges from 9 to 22 min.When the pressure relief setting of the tank is close to its burst pressure,the damage tolerance is low,resulting in a high risk of explosion under fire conditions.After fire exposure and subsequent cooling,the tanks still exhibit relatively high residual strength,approximately 2.09～3.37 times the NWP.It is recommended that,with the objective of"pressure release first",the safety threshold for tank burst strength under fire conditions be further refined,and that standardized testing methods for post-fire residual strength be established.This study provides a technical basis for the comprehensive safety assessment of hydrogen storage tanks in fire scenarios.