液氧大流量深度过冷方案对比分析

Comparison analysis on deep subcooled method of large flow rate for liquid oxygen

为了获得深度过冷液氧,梳理了多套深度过冷方案,并对各方案建立了热力学模型,讨论了各过冷方案对于大流量边过冷边加注下冷却工质、抽空/制冷功率消耗等影响。结果表明:对液氧进行深度过冷时,常沸点温度与三相点温度相差较大,需分温区进行过冷方案讨论。对于78—90 K温区,建议采用常压液氮浴可经济方便地满足过冷需求;对于66—78 K温区,采用常沸点液氮浴+负压液氮浴相结合的两级过冷方案较为可行。对于55—66 K温区,采用液氮浴+氦制冷相结合的过冷方案较为经济可行。

In order to obtain deep subcooled liquid oxygen,several sets of subcooling schemes were combed,and the thermodynamic model was established for each scheme.The influence of each scheme on cooling working medium,pumping/cooling power consumption at large flow rate was discussed.The results show that there is a larger difference between the normal boiling point temperature and the triple point temperature when the liquid oxygen is deeply subcooled,so it is necessary to discuss the subcooling scheme in different temperature regions.For the temperature range from 78 K to 90 K,it is suggested to use atmospheric pressure liquid nitrogen bath to meet the subcooling demand economically and conveniently.For the temperature range from 66-78 K,it is feasible to adopt the two-stage subcooling scheme which combines the liquid nitrogen bath with the constant boiling point and the negative pressure liquid nitrogen bath.For the temperature range 55-66 K,the subcooling scheme combining liquid nitrogen bath and helium refrigeration is more economical and feasible.