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分析了大型卧式液氢贮罐增压输出过程中低温介质传热数学模型,揭示了贮罐内液氢温度分布规律,说明了液氢温度分层形成的原因及过程,给出了输出液氢品质保障方法。研究表明:大型卧式液氢贮罐输出过程中液氢温度分布可用修正后的半无限大平板非稳态导热方程描述;在增压压力一定情况下,热液层厚度随着输送时间的增加而增大,且热液层厚度及其温度分布受卧式贮罐截面形状影响;液氢贮罐输出品质与贮罐内热液层厚度密切相关,可通过计算热液层厚度从而确定贮罐留底余量的方法,保证贮罐输出品质。
The mathematical model of heat transfer of low temperature medium in supercharging process of large horizontal liquid hydrogen storage tank was analyzed. The distribution law of liquid hydrogen temperature in storage tank was revealed. The reason and process of liquid hydrogen temperature stratification were explained. Hydrogen quality assurance methods. The results show that the distribution of liquid hydrogen temperature in large horizontal liquid hydrogen storage tank can be described by the modified semi-infinite plate unsteady heat conduction equation. Under certain supercharging pressure, the thickness of hydrothermal layer increases with the increase of transportation time And the thickness of the hydrothermal layer and its temperature distribution are affected by the shape of the cross-section of the horizontal tank. The output quality of the liquid hydrogen tank is closely related to the thickness of the hydrothermal layer in the tank. The thickness of the hydrothermal layer can be determined to determine the tank The remaining margin of the method to ensure the output quality of storage tanks.