摘要
为了有效提升液氢储罐的绝热性能,构建了真空多层绝热液氢储罐的瞬态传热传质模型,并研究了集成氢仲正催化转化的蒸气冷却屏的影响。引入蒸气消耗因子η_(c)、休眠期延长因子η_(d)等无量纲参数分别量化蒸气消耗量和储罐休眠期;定义单位因子η为η_(d)与η_(c)之比,表征蒸气冷却屏屏蔽漏热的能力。对比分析了有无仲正催化转化时蒸气冷却屏无量纲位置、质量流量和开启时刻等参数对储罐休眠期的影响。结果表明:η_(d)和η均随蒸气冷却屏无量纲位置的增大而先增大后减小;当η_(c)为0.012 8且蒸气冷却屏无量纲位置是0.167时,加入仲正催化转化相比未加入时的两个指标的增幅最大,为22.77%;随着蒸气冷却屏质量流量的减小,两个指标均先增大后减小;当蒸气冷却屏无量纲位置和蒸气冷却屏质量流量均较小时,加入仲正催化转化后两个指标的增幅较大;两个指标随着蒸气冷却屏开启时刻的推迟而先增大后减小;在η_(c)和蒸气冷却屏无量纲位置分别为0.025 6和0.233的条件下,蒸气冷却屏开启时刻设置为第40.51 d时,加入仲正催化转化后η的增幅最大为22.32%。
To effectively improve the thermal insulation performance of liquid hydrogen storage tanks,a transient heat and mass transfer model for vacuum multilayer insulated liquid hydrogen storage tanks is developed,and the effect of integrating a vapor-cooled shield with ortho-para hydrogen catalytic conversion is investigated.Dimensionless parameters,including the vapor consumption factor(η_(c))and the dormancy period extension factor(η_(d)),are introduced to quantify vapor consumption and tank dormancy period,respectively.A unit factor(η),defined as the ratio ofη_(d) toη_(c),is used to characterize the heat-leak shielding capability of the vapor-cooled shield.A comparative analysis is conducted on the effects of key parameters,such as the dimensionless position of the vapor-cooled shield,mass flow rate,and activation timing,on the tank dormancy period,with and without ortho-para catalytic conversion.The results indicate that:Bothη_(d) andηinitially increase and then decrease as the dimensionless position of the vapor-cooled shield increases;whenη_(c)=0.0128 and the dimensionless position of the vapor-cooled shield is 0.167,the inclusion of ortho-para catalytic conversion yields the maximum improvement in both metrics(22.77%)compared to the non-catalytic case;as the mass flow rate of the vapor-cooled shield decreases,both metrics first increase and then decrease;the improvement in both metrics is more pronounced when the dimensionless position and mass flow rate of the vapor-cooled shield are relatively small;both metrics initially increase and then decrease with delayed activation of the vapor-cooled shield;under conditions whereη_(c)=0.0256 and the dimensionless position of the vapor-cooled shield is 0.233,activating the shield at 40.51 d achieves the maximum improvement of 22.32%inηwith ortho-para catalytic conversion.
作者
李科
朱顺
文键
LI Ke;ZHU Shun;WEN Jian(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
北大核心
2025年第7期170-181,共12页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金重大资助项目(52495001)
中国博士后基金资助项目(2022M722518)
陕西省自然科学基础研究计划资助项目(S2024-JC-QN-2738)。
关键词
液氢储罐
真空多层绝热
蒸气冷却屏
氢仲正催化转化
瞬态传热传质模型
liquid hydrogen tank
vacuum multi-layer insulation
vapor-cooled shield
hydrogen para-ortho catalytic conversion
transient heat and mass transfer model
