The internal support design and thermal structure characteristics of a liquid hydrogen horizontal storage tank
To meet the strength and low boil-off rate requirements of the liquid hydrogen storage tank,a composite internal support structure with a suspension rod,tension rod and fiberglass was specifically designed for application in such tank.Finite element methods were employed to analyze the thermo-structural coupling characteristics of the storage tank under normal oper-ating conditions and evaluate its structural strength during empty transportation.The results indicate that the heat leakage contri-bution of the internal support structure is 14.18％,significantly lower than that of similar storage tanks(20％to 50％).The daily boil-off rate of the tank is 0.365％/d,which is below the standard threshold of 0.465％/d.Thermal stress loading sig-nificantly impacts the performance of the suspension rod support,primarily introducing additional bending moments under thermal stress.The maximum stress reaches 833.93 MPa.When pressure loading is subsequently applied,the additional bending mo-ments on the suspension rod are markedly reduced,resulting in a 50.5％decrease in the maximum stress.Under normal operat-ing conditions,the connection between the rod end and the rod body serves as the stress concentration area of the internal sup-port.During empty tank transportation,stress concentration is observed at the welds between the lug plate and the pad plate.Therefore,structural dimensions at these locations can be further optimized to reduce stress levels.
Internal support structureThermo-structural couplingHeat leakageStress intensity
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