小型液氢储罐的热分析研究OA

The key heat loss issues in small liquid hydrogen storage and transportation are addressed in this paper.A combined method of structural optimization design and multi-physics numerical simulation is adopted to systematically investigate the overall structural parameters of small liquid hydrogen storage tanks,the heat transfer characteristics and thermal protection performance of each core component.It focuses on analyzing the heat leakage paths,total heat leakage distribution,and variation laws of the daily static evaporation rate of liquid hydrogen under normal temperature(27℃)and extreme high temperature(40℃)operating conditions.The results demonstrate that:under normal temperature conditions,the total heat leakage of the liquid hydrogen storage tank is 5.12 W,and it slightly increases to 5.54 W under extreme temperature conditions.The difference in heat leakage between the two conditions is mainly attributed to the enhanced radiation and convective heat transfer caused by the temperature difference of the external environment;the daily evaporation rates of liquid hydrogen under normal and extreme temperature conditions are both reduced by more than 40%compared with the current industry indicators of 2.11%for 5 m³ containers and 1.51%for 10 m³ containers.Among the structural components of the liquid hydrogen storage tank,the heat leakage of stainless steel tie rods accounts for 17%-18%,and that of epoxy glass fiber reinforced plastic supports accounts for 32%-33%,which are the main heat leakage sources.However,through the optimized arrangement of multi-layer thermal insulation materials in the interlayer space,the temperature gradient is controlled within a reasonable range,effectively suppressing heat transfer.